Hitachi RPI-1.0FSG1, RPI-1.5FSG1, RPI-3.0FSG1, RPI-2.5FSG1, RPI-4.0FSG1 Service Manual

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Page 1

Models <Indoor Units>

• In-the-Ceiling Type

RPI-0.8FSG1 RPI-2.5FSG1 RPI-8FSG1 RPI-1.0FSG1 RPI-3.0FSG1 RPI-10FSG1 RPI-1.5FSG1 RPI-4.0FSG1 RPI-2.0FSG1 RPI-5.0FSG1

• 4-Way Cassette Type

RCI-1.0FSG2 RCI-2.5FSG2 RCI-5.0FSG2 RCI-1.5FSG2 RCI-3.0FSG2 RCI-2.0FSG2 RCI-4.0FSG2

• 2-Way Cassette Type

RCD-1.0FSG1 RCD-2.5FSG1 RCD-5.0FSG1 RCD-1.5FSG1 RCD-3.0FSG1 RCD-2.0FSG1 RCD-4.0FSG1

•Wall Type

RPK-1.0FSGM6 RPK-2.0FSGM6 RPK-1.5FSGM6 RPK-2.3FSGM6

• Floor Type

RPF-1.0FSG(E) RPF-1.5FSG(E)

• Floor Concealed Type

RPFI-1.0FSG(E) RPFI-1.5FSG(E)

• Ceiling Type

RPC-2.0FSG1 RPC-3.0FSG1 RPC-5.0FSG1 RPC-2.5FSG1 RPC-4.0FSG1

• FSG(1) Series

RAS-5FSG RAS-16FSG RAS-24FSG1 RAS-8FSG RAS-20FSG RAS-30FSG1 RAS-10FSG

•FS3, FS5 Series

RAS-5FS3 RAS-16FS3 RAS-24FS5 RAS-8FS3 RAS-20FS3 RAS-30FS5 RAS-10FS3

• FXG Series

RAS-8FXG RAS-10FXG

• FX3 Series

RAS-8FX3 RAS-10FX3

•Total Heat Exchangers

KPI-2521 KPI-5021 KPI-8021 KPI-10021

This service mamual provides the technical information for the HITACHI Inverter-Driven Multi-Split System Heat Pump Air Conditioners, “SET FREE, FSG(1)/FS3, FS5 and FXG/FX3 Series”. Read this manual carefully before starting service activities.

HITACHI INVERTER-DRIVEN

MULTI-SPLIT SYSTEM

HEAT PUMP AIR CONDITIONERS

SET FREE FSG(1)/FS3, FS5 SERIES

AND

SET FREE FXG/FX3 SERIES

P5413553

Page 2

Page 3

- CONTENTS -

No. Page

1. TROUBLESHOOTING ............................................................................................................................... 1-1

1.1 Initial Troubleshooting ........................................................................................................................ 1-1

1.1.1 Rotary Switch and Dip Switch Setting .......................................................................................... 1-1

1.1.2 Checking of Electrical Wiring ........................................................................................................ 1-5

1.1.3 Checking by 7-Segment Display ................................................................................................. 1-10

1.1.4 Emergency Operation when Inverter Compressor is Damaged ................................................... 1-11

1.1.5 Failure of Power Supply to Indoor Unit and Remote Control Switch ............................................ 1-13

1.1.6 Abnormal Transmission between Remote Control Switch and Indoor Unit .................................. 1-14

1.1.7 Abnormalities of Devices .............................................................................................................. 1-15

1.2 Troubleshooting Procedure ................................................................................................................ 1-23

1.2.1 Alarm Code Table ......................................................................................................................... 1-23

1.2.2 Troubleshooting by Alarm Code ................................................................................................... 1-24

1.2.3 Troubleshooting in Check Mode by Remote Control Switch ........................................................ 1-79

1.2.4 Troubleshooting by 7-Segment Display........................................................................................ 1-85

1.2.5 Function of RSW, DSWs and LEDs.............................................................................................. 1-94

1.3 Procedure of Checking Each Main Parts ........................................................................................... 1-103

1.3.1 Self-Checking of PCBs using Remote Control Switch .................................................................. 1-103

1.3.2 Self-Checking of Remote Control Switch ..................................................................................... 1-105

1.3.3 Self-Checking of Indoor Unit PCB

(Except for: RCI, RCD, RPI (0.8 to 5.0HP), RPC (After Alteration) and KPI) .............................. 1-107

1.3.4 Self-Checking of 7-Day Timer (PSC-3T) ...................................................................................... 1-109

1.3.5 Self-Checking of Central Station (PSC-3S1) ................................................................................ 1-110

1.3.6 Procedure of Checking Other Main Parts ..................................................................................... 1-111

1.4 Test Run ............................................................................................................................................. 1-125

1.4.1 Test Run Mode by Remote Control Switch ................................................................................... 1-125

1.4.2 Test Run Mode by Outdoor Unit ................................................................................................... 1-126

1.4.3 Checking List (FSG and FS3 Series) ........................................................................................... 1-127

Page 4

- CONTENTS -

No. Page

2. SERVICING ................................................................................................................................................ 2-1

2.1 Outdoor Unit ....................................................................................................................................... 2-1

2.1.1 Removing Air Intake Grille ............................................................................................................ 2-1

2.1.2 Removing Front Service Panel ..................................................................................................... 2-2

2.1.3 Removing Fan Guard Nets ........................................................................................................... 2-3

2.1.4 Removing Outdoor Fan ................................................................................................................ 2-4

2.1.5 Removing Compressor (RAS-5FSG and RAS-5FS3) .................................................................. 2-6

2.1.6 Removing Compressors (RAS-8FSG, RAS-10FSG, RAS-16FSG, RAS-20FSG, RAS-8FS3, RAS-10FS3, RAS-16FS3,

RAS-20FS3, RAS-8FXG, RAS-10FXG, RAS-8FX3 and RAS-10FX3) ........................................ 2-10

2.1.7 Removing Compressors for MC1 and MC2

(RAS-24FSG1, RAS-30FSG1, RAS-24FS5 and RAS-30FS5) ..................................................... 2-15

2.1.8 Removing Compressors for MC3 and MC4

(RAS-24FSG1, RAS-30FSG1, RAS-24FS5 and RAS-30FS5) ..................................................... 2-19

2.1.9 Removing High Pressure Switch, High Pressure Sensor and Low Pressure Sensor .................. 2-23

2.1.10 Removing Coil for Reversing Valve Coil ....................................................................................... 2-26

2.1.11 Removing Coil for Solenoid Valve Coil ......................................................................................... 2-27

2.1.12 Removing Thermistor for Liquid Pipe ........................................................................................... 2-28

2.1.13 Removing Reversing Valve (RAS-5FSG, RAS-8FSG, RAS-10FSG, RAS-16FSG, RAS-20FSG, RAS-5FS3, RAS-8FS3, RAS-10FS3, RAS-16FS3, RAS-20FS3, RAS-8FXG, RAS-10FXG,

RAS-8FX3 and RAS-10FX3) ........................................................................................................ 2-29

2.1.14 Removing Reversing Valve (RAS-24FSG1, RAS-30FSG1, RAS-24FS5 and RAS-30FS5)......... 2-30

2.1.15 Removing Electrical Components (RAS-5FSG, RAS-8FSG, RAS-10FSG, RAS-16FSG, RAS-20FSG, RAS-5FS3, RAS-8FS3, RAS-10FS3, RAS-16FS3, RAS-20FS3, RAS-8FXG,

RAS-10FXG, RAS-8FX3 and RAS-10FX3) .................................................................................. 2-31

2.1.16 Removing Electrical Components

(RAS-24FSG1, RAS-30FSG1, RAS-24FS5 and RAS-30FS5) ..................................................... 2-33

2.2 In-the-Ceiling Type (RPI-0.8FSG1 to RPI-5.0FSG1) ......................................................................... 2-37

2.2.1 Removing Long Life Filter............................................................................................................. 2-37

2.2.2 Removing Printed Circuit Board (PCB) ........................................................................................ 2-37

2.2.3 Removing Indoor Fan and Fan Motor........................................................................................... 2-39

2.2.4 Removing Thermistor for Liquid Piping and Gas Piping ............................................................... 2-46

2.2.5 Removing Electronic Expansion Valve Coil .................................................................................. 2-47

2.2.6 Removing Float Switch ................................................................................................................. 2-47

2.2.7 Removing Drain Pump ................................................................................................................. 2-48

2.2.8 Removing Drain Pan .................................................................................................................... 2-49

2.3 In-the-Ceiling Type (RPI-8FSG1 and RPI-10FSG1) .......................................................................... 2-51

2.3.1 Removing Long Life Filter............................................................................................................. 2-51

2.3.2 Removing Printed Circuit Board (PCB) ........................................................................................ 2-51

2.3.3 Removing Indoor Fan and Fan Motor........................................................................................... 2-52

2.3.4 Removing Electronic Expansion Valve and Thermistors .............................................................. 2-54

Page 5

- CONTENTS -

No. Page

2.4 4-Way Cassette Type ......................................................................................................................... 2-55

2.4.1 Removing Long Life Filter ............................................................................................................. 2-55

2.4.2 Removing Air Intake Grille ............................................................................................................ 2-55

2.4.3 Removing Electrical Box Cover .................................................................................................... 2-56

2.4.4 Removing Optional Air Panel........................................................................................................ 2-56

2.4.5 Removing Fan Runner and Fan Motor ......................................................................................... 2-57

2.4.6 Removing Bell-Mouth ................................................................................................................... 2-58

2.4.7 Removing Printed Circuit Board (PCB) ........................................................................................ 2-59

2.4.8 Removing Drain Pan .................................................................................................................... 2-60

2.4.9 Removing Drain-Up Mechanism ................................................................................................... 2-61

2.4.10 Removing Float Switch ................................................................................................................. 2-61

2.4.11 Removing Thermistors for Liquid Pipe and Gas Pipe ................................................................... 2-62

2.4.12 Removing Electronic Expansion Valve Coil .................................................................................. 2-63

2.4.13 Removing Automatic Louver Motor .............................................................................................. 2-65

2.5 2-Way Cassette Type ......................................................................................................................... 2-66

2.5.1 Removing Long Life Filter and Air Intake Grille ............................................................................ 2-66

2.5.2 Removing Electrical Box Cover .................................................................................................... 2-66

2.5.3 Removing Optional Air Panel........................................................................................................ 2-67

2.5.4 Removing Fan Runner and Fan Motor ......................................................................................... 2-68

2.5.5 Removing Printed Circuit Board (PCB) ........................................................................................ 2-70

2.5.6 Removing Float Switch ................................................................................................................. 2-71

2.5.7 Removing Drain-Up Mechanism ................................................................................................... 2-72

2.5.8 Removing Drain Pan .................................................................................................................... 2-73

2.5.9 Removing Thermistors for Liquid and Gas Pipes ......................................................................... 2-74

2.5.10 Removing Electronic Expansion Valve Coil .................................................................................. 2-75

2.5.11 Removing Automatic Louver Motor .............................................................................................. 2-77

2.6 Wall Type ........................................................................................................................................... 2-79

2.6.1 Removing Air Filter ....................................................................................................................... 2-79

2.6.2 Removing Front Panel .................................................................................................................. 2-80

2.6.3 Removing Motor for Automatic Louver ......................................................................................... 2-82

2.6.4 Removing Thermistors for Liquid Pipe, Gas Pipe, Discharge Air and Suction Air ........................ 2-83

2.6.5 Removing Electrical Box Cover .................................................................................................... 2-85

2.6.6 Removing Indoor PCB .................................................................................................................. 2-86

2.6.7 Removing Drain Pan .................................................................................................................... 2-87

2.6.8 Removing Heat Exchanger........................................................................................................... 2-88

2.6.9 Removing Fan and Fan Motor ...................................................................................................... 2-90

2.6.10 Removing Electronic Expansion Valve Coil .................................................................................. 2-92

2.7 Floor Type .......................................................................................................................................... 2-94

2.7.1 Removing Air Intake Grille ............................................................................................................ 2-94

2.7.2 Removing Air Filter ....................................................................................................................... 2-94

2.7.3 Removing Discharge Air Grille...................................................................................................... 2-95

2.7.4 Removing Front Cover ................................................................................................................. 2-95

2.7.5 Removing Fan Motor .................................................................................................................... 2-96

2.7.6 Removing Printed Circuit Board (PCB) ........................................................................................ 2-98

2.7.7 Removing Thermistors for Liquid Pipe and Gas Pipe................................................................... 2-100

Page 6

- CONTENTS -

No. Page

2.8 Floor Concealed Type ........................................................................................................................ 2-102

2.8.1 Removing Air Filter ....................................................................................................................... 2-102

2.8.2 Removing Front Covers ................................................................................................................ 2-102

2.8.3 Removing Fan Motor .................................................................................................................... 2-103

2.8.4 Removing Printed Circuit Board (PCB) ........................................................................................ 2-103

2.8.5 Removing Thermistors for Liquid Pipe and Gas Pipe................................................................... 2-103

2.9 Ceiling Type ....................................................................................................................................... 2-104

2.9.1 Removing Air Filter and Air Intake Grille ....................................................................................... 2-104

2.9.2 Removing Side Cover................................................................................................................... 2-104

2.9.3 Removing Discharge Air Grille...................................................................................................... 2-105

2.9.4 Removing Fan Motor .................................................................................................................... 2-106

2.9.5 Removing Bearing ........................................................................................................................ 2-108

2.9.6 Removing Coupling ...................................................................................................................... 2-108

2.9.7 Removing Automatic Louver Motor .............................................................................................. 2-109

2.9.8 Removing Thermistors for Liquid Pipe and Gas Pipe, and Electronic Expansion Valve Coil ....... 2-109

2.9.9 Checking Procedures for Electronic Expansion Valve Coil .......................................................... 2-110

2.9.10 Removing Printed Circuit Board (PCB) ........................................................................................ 2-111

2.10 Total Heat Exchanger......................................................................................................................... 2-112

2.10.1 Structure ....................................................................................................................................... 2-112

2.10.2 Removing Electrical Parts ............................................................................................................ 2-112

2.10.3 Removing Air Filter and Total Heat Exchanger Element ............................................................... 2-113

2.10.4 Removing Fan Motor .................................................................................................................... 2-114

2.10.5 Air Filter Cleaning ......................................................................................................................... 2-115

2.10.6 Total Heat Exchanger Cleaning .................................................................................................... 2-115

2.11 Cleaning Indoor Unit Heat Exchanger ............................................................................................... 2-116

2.11.1 Required Tools for Cleaning (for All Indoor Units) ........................................................................ 2-116

2.11.2 In-the-Ceiling Type ....................................................................................................................... 2-117

2.11.3 Cleaning 4-Way Cassette Type Indoor Unit..................................................................................2-120

2.11.4 Cleaning 2-Way Cassette Type Indoor Unit..................................................................................2-124

2.11.5 Cleaning Wall Type Indoor Unit .................................................................................................... 2-127

2.11.6 Cleaning Floor Type and Floor Concealed Type Indoor Unit........................................................ 2-128

2.11.7 Cleaning Ceiling Type Indoor Unit ................................................................................................ 2-131

2.12 Collecting Refrigerant for Replacing Indoor Unit ................................................................................ 2-133

Page 7

3. MAIN PARTS .............................................................................................................................................. 3-1

3.1 Inverter ............................................................................................................................................... 3-1

3.1.1 Specifications of Inverter (For 380/415V, 50Hz and 380V, 60Hz Power Source) ......................... 3-1

3.1.2 Specifications of Inverter (For 220V, 60Hz Power Source) .......................................................... 3-3

3.1.3 Arrangement of Inverter Power Unit ............................................................................................. 3-5

3.1.4 Inverter Time Chart ....................................................................................................................... 3-9

3.1.5 Protective Function ....................................................................................................................... 3-10

3.1.6 Overload Control .......................................................................................................................... 3-11

3.2 AC Chopper ....................................................................................................................................... 3-12

3.3 Auto-Louver Mechanism .................................................................................................................... 3-14

3.3.1 4-Way Cassette Type ................................................................................................................... 3-14

3.3.2 2-Way Cassette Type ................................................................................................................... 3-15

3.3.3 Ceiling Type..................................................................................................................................... 3-16

3.4 Scroll Compressor ............................................................................................................................. 3-17

3.4.1 Reliable Mechanism for Low Vibration and Low Sound ............................................................... 3-17

3.4.2 Principle of Compression.............................................................................................................. 3-17

3.4.3 Structure ....................................................................................................................................... 3-18

3.5 Thermistor .......................................................................................................................................... 3-20

3.5.1 Thermistor for Indoor Unit ............................................................................................................. 3-20

3.5.2 Thermistor for Outdoor Unit .......................................................................................................... 3-21

3.6 Electronic Expansion Valve ................................................................................................................ 3-23

3.6.1 Electronic Expansion Valve for Outdoor Units.............................................................................. 3-23

3.6.2 Electronic Expansion Valve for Indoor Units................................................................................. 3-24

3.7 Pressure Sensor ................................................................................................................................ 3-25

3.8 High Pressure Protection Device ....................................................................................................... 3-26

3.9 Noise Filter (NF) ................................................................................................................................. 3-27

3.10 Capacitor (CB1, CB2) ........................................................................................................................ 3-29

3.11 Reactor (DCL) .................................................................................................................................... 3-29

- CONTENTS -

No. Page

Page 8

4. OPTIONAL FUNCTION .............................................................................................................................. 4-1

4.1 Indoor Unit

(For RPF(I)-FSG(E), RPK-FSGM(6), RPC-FSG1 (Before Alteration) and RPI (8, 10HP) Series) .... 4-1

4.1.1 Remote Control ON/OFF Function ............................................................................................... 4-1

4.1.2 Power Supply ON/OFF 1 (Automatic Operation When Power Supply ON).................................. 4-5

4.1.3 Power Supply ON/OFF 2 (Restarting Function After Power Failure)............................................ 4-5

4.1.4 Control by Field-Supplied Room Thermostat ............................................................................... 4-6

4.1.5 Operation Control by Remote Temperature Sensor (Except for RPK-FSGM Series) .................. 4-7

4.1.6 Cooling or Heating Operation Mode Setting Change by External Input (Level Signal Input) ....... 4-7

4.1.7 Picking Up Operation Signal......................................................................................................... 4-8

4.2 Indoor Unit (For RPI (0.8 to 5.0HP), RCI, RCD, RPC (After Alteration) and KPI Series) ................... 4-11

4.2.1 Input and Output Setting of Indoor PCB Connector ..................................................................... 4-11

4.2.2 Remote Control Thermistor Function............................................................................................ 4-13

4.2.3 Remote Control ON/OFF Function ............................................................................................... 4-14

4.2.4 Power Supply ON/OFF 1 (Automatic Operation When Power Supply ON).................................. 4-18

4.2.5 Power Supply ON/OFF 2 (Restarting Function After Power Failure)............................................ 4-18

4.2.6 Control by Field-Supplied Room Thermostat (Except for KPI Series) .......................................... 4-19

4.2.7 Operation Control by Remote Temperature Sensor (Except for KPI Series) ................................ 4-20

4.2.8 Cooling or Heating Operation Mode Setting Change by External Input (Except for KPI Series).. 4-20

4.2.9 Precooling/Preheating Operation (KPI Series Only)..................................................................... 4-21

4.2.10 Picking Up Operation Signal ......................................................................................................... 4-21

4.3 Outdoor Unit ....................................................................................................................................... 4-25

4.3.1 Demand ........................................................................................................................................ 4-27

4.3.2 Forced Stoppage .......................................................................................................................... 4-27

4.3.3 Demand Current Control (Only for 24 and 30HP) ........................................................................ 4-28

4.3.4 Fixing Operation Mode ................................................................................................................. 4-28

4.3.5 Snow Sensor ................................................................................................................................ 4-29

4.3.6 Defrosting Condition Changeover ................................................................................................ 4-30

4.3.7 Indoor Fan Control during Thermo-OFF at Heating ..................................................................... 4-30

4.3.8 All Season Heating Operation ...................................................................................................... 4-31

4.3.9 All Season Cooling Operation ...................................................................................................... 4-31

4.3.10 Night Shift (Low Sound) Operation ................................................................................................ 4-32

4.3.11 Picking Up Signals from Outdoor Unit Printed Circuit Board ........................................................ 4-33

4.4 Remote Control Switch, PC-P1H and PC-2H2 .................................................................................. 4-35

4.4.1 Name of Part ................................................................................................................................ 4-35

4.4.2 Simultaneous Operation ............................................................................................................... 4-36

4.4.3 Operation System with Two Remote Control Switches ................................................................ 4-38

4.4.4 Optional Function Setting ............................................................................................................. 4-40

4.4.5 Optional Functions of Remote Control Switch .............................................................................. 4-43

4.4.6 Indication of Address (ADDS) and Refrigerant Cycle Number (RN)............................................. 4-47

4.5 Wireless Remote Control Switch, PC-LH3 ......................................................................................... 4-48

4.5.1 Name of Part ................................................................................................................................ 4-48

4.5.2 Identifying of Indoor Units Installed Side By Side ......................................................................... 4-49

4.5.3 Simultaneous Operation ............................................................................................................... 4-50

4.5.4 Emergency Operation................................................................................................................... 4-52

4.5.5 Optional Function Setting (In Case of PC-RLH4, PC-RLH5 and PC-RLH7) ................................ 4-53

4.5.6 Optional Functions of Wireless Remote Control Switch ............................................................... 4-54

4.6 7-Day Timer, PSC-5T ......................................................................................................................... 4-55

4.7 Central Station, PSC-5S .................................................................................................................... 4-56

- CONTENTS -

No. Page

Page 9

5. FIELD WORK INSTRUCTION.................................................................................................................... 5-1

5.1 Burnt-out Compressor due to Insufficient Refrigerant Charge ........................................................... 5-1

5.2 Insufficient Cooling Performance When A Long Piping Is Applied ..................................................... 5-2

5.3 Abnormally High Operating Sound [In-the-Ceiling Type Indoor Unit] ................................................. 5-3

5.4 Alarm Code “31” ................................................................................................................................. 5-4

5.5 Not Cooling Well due to Insufficient Installation Space for Outdoor Unit ........................................... 5-5

5.6 Attention for SET-FREE FXG/FX3 Series .......................................................................................... 5-6

5.7 Select Guide of Drain Pipe for Indoor Unit ......................................................................................... 5-11

5.8 Caution on Refrigerant Leakage ........................................................................................................ 5-12

5.9 Maintenance Work ............................................................................................................................. 5-14

5.10 Service & Maintenance Record by 7-Segment Display ..................................................................... 5-15

5.11 Service & Maintenance Record by Remote Control Switch ............................................................... 5-16

5.12 Service & Maintenance Record ......................................................................................................... 5-17

- CONTENTS -

No. Page

Page 10

There are some alterations (mainly in PCB) in the indoor unit, and the distinction of the alterations are partly outlined in this manual. See the following table for the details.

Before Alteration After Alteration

CODE Production Shift CODE Production Shift RPC-2.0FSG1 60277344 60277631 From U4UH7706 RPC-2.5FSG1 60277345 60277632 From U4UH7711 RPC-3.0FSG1 60277346 60277633 From U4UR7514 RPC-4.0FSG1 60277347 60277634 From U4UK7994 RPC-5.0FSG1 60277348 60277635 From U4UT2827 RCD-1.0FSG1 60277510 60277571 From U4UR7004 RCD-1.5FSG1 60277511 60277572 From U4UN0462 RCD-2.0FSG1 60277512 60277573 From U4UN0507 RCD-2.5FSG1 60277513 60277574 From U4US3677 RCD-3.0FSG1 60277514 60277575 From U4UT2126 RCD-4.0FSG1 60277515 60277576 From U4UT2131 RCD-5.0FSG1 60277516 60277577 From U4UT2136 RPI-0.8FSG1 60277401 60277591 From U4UH8281 RPI-1.0FSG1 60277402 60277592 From U4UH8301 RPI-1.5FSG1 60277403 60277593 From U4UD3950 RPI-2.0FSG1 60277339 60277594 From U4UH8341 RPI-2.5FSG1 60277340 60277595 From U4UH8361 RPI-3.0FSG1 60277341 60277596 From U4UH8381 RPI-4.0FSG1 60277342 60277597 From U4UH8431 RPI-5.0FSG1 60277343 60277598 From U4UH8451 RPI-8FSG1 60277485 From First Production - RPI-10FSG1 60277486 From First Production - RPK-1.0FSGM 60277412 60277699 *1) From U4UR1494 RPK-1.5FSGM 60277413 60277700 *1) From U4UR1514 RPK-2.0FSGM 60277414 60277701 *1) From U4UR1578 RPK-2.3FSGM 60277415 60277702 *1) From U4UR1588 RPF-1.0FSG 60277305 From First Production - RPF-1.5FSG 60277306 From First Production - RPFI-1.0FSG 60277307 From First Production - RPFI-1.5FSG 60277308 From First Production - RCI-1.0FSG2 - - 60277611 From First Production RCI-1.5FSG2 - - 60277612 [Full Model Change] RCI-2.0FSG2 - - 60277613 RCI-2.5FSG2 - - 60277614 RCI-3.0FSG2 - - 60277615 RCI-4.0FSG2 - - 60277616 RCI-5.0FSG2 - - 60277617 COMMON 1. The indication "USE PC-P1H"

is shown in the indication label of the packing.

2. The indication "USE PC-P1H" is shown on the electrical box cover.

*1): The model name is indicated as shown when after alteration. (RPK Models Only) ex.) RPK-1.0FSGM6

Model

RCI

Page 11

1-1

TROUBLESHOOTING

1. TROUBLESHOOTING

1.1 Initial Troubleshooting

1.1.1 Rotary Switch and Dip Switch Setting (1) Indoor Unit

The PCB in the indoor unit is equipped with 7 types of dip switches and rotary switch. Before testing unit, set these dip switches according to the following instructions. Unless these dip switches are set in the field, the unit can not be operated.

Before setting dip switches, firstly turn OFF power source and set the position of the dip switches. If the switches are set without turning OFF the power source, the switches can not function.

The “” mark indicates position of dip switches. Figures show the setting before shipment.

a. Unit No. Setting (RSW)

Setting is required. Set the unit No. of all indoor units respectively and serially, by following setting position shown in the table below. Numbering must start from “0” for every outdoor unit.

b. Optional Function Setting (DSW2)

No setting is required. Setting position before shipment is all OFF.

Rotary Switch Setting

No. 0 Unit

No. 1 Unit

No. 2 Unit

No. 3 Unit

No. 4 Unit

No.5 Unit

No. 6 Unit

No. 7 Unit

No. 8 Unit

No. 9 Unit

No. 10 Unit

No. 11 Unit

No. 12 Unit

No. 13 Unit

No. 14 Unit

No. 15 Unit

Setting Position

Set by inserting slotted screwdriver into the groove

NOTE

c. Capacity Code Setting (DSW3)

No setting is required, due to setting before shipment. This switch is used for setting the capacity code which corresponds to the Horse-Power of the indoor unit.

1234

OFF

1234

OFF

1234

OFF

1234

OFF

1234

OFF

1234

OFF

1234

OFF

1234

OFF

1234

OFF

1234

OFF

1234

OFF

1234

OFF

1234

OFF

1234

OFF

Setting Position

1.00.8 1.3 1.5 1.8

2.32.0

2.8 3.0 4.0 5.0 8.0 10.0

2.5

Horsepower

0.8 1.0 1.5 2.0 2.3 2.5 3.0 4.0 5.0 8.0 10.0

RCI

 

RPI

 

RCD

 

RPF and RPFI



RPK



 : Available

OFF

RPC(Before Alteration) RCD(Before Alteration) RPI-0.8 to 1.5(Before Alteration)

12 3 4 5 6 7 8

OFF

RPF, RPFI, RPI-8,10 and RPK

Page 12

1-2

TROUBLESHOOTING

d. Capacity Adjustment Setting (DSW4: for RPF, RPFI, RPI-8,10 and RPC(Before Alteration))

No setting is required. Setting position before shipment is all OFF.

e. Refrigerant Cycle No. Setting (DSW5)

Setting is required. Setting position before shipment is all OFF.

f. Unit Code Setting (DSW6; Except for RCI and RPK Model)

No setting is required. Setting positions of the model code for indoor units are shown below.

g. Fuse Recover (DSW7) (for Auxiliary use)

No setting is required. Setting position before shipment is all OFF.

(2) Outdoor Unit

TURN OFF all power sources before setting. Without turning OFF, the switches do not work and the contents of the setting are invalid. Mark of “■” indicates the position of dip switches. Set the dip switches according to the figure below.

Check to ensure that the #8 pin of DSW5 is correctly set according to the power supply of the unit. If the setting is different from the power supply of the unit, it may cause the unit stoppage due to alarm or the breakdown of the compressor.

• By using switch DSW4, 7 and 8 the unit is started or stopped after 10 to 20 seconds after the switch is operated.

• Make the outdoor unit No. clear to distinguish from other outdoor units for service and maintenance.

NOTE

ON OFF

Setting Pattern

1 234

ON OFF

0.8 to 10

Horse-Power

Setting Pattern

1 234

ON OFF

1 234

ON OFF

1 234

ON OFF

1 234

ON OFF

Model Code

RPI-0.8FSG1

Model Code

<Model Code> (a) RPI-0.8FSG1 to RPI-10FSG1 (b) RCD-1.0FSG1 to RCD-5.0FSG1 (c) RPC-2.0FSG1 to RPC-5.0FSG1 (d) RPF-1.0FSG(E) and RPFI-1.0 FSG(E) (e) RPF-1.5FSG(E) and RPFI-1.5FSG(E)

Setting

Position

1 234

ON OFF

Model Code

Setting

Position

b c

ON OFF

Setting

Pattern

Page 13

1-3

TROUBLESHOOTING

1 234

1 23456

DSW1 Ref. System No. Setting

When H-Link is used, setting is required.

No.0 Unit Setting Condition

Set the unit number of outdoor unit at each refrigerant cycle. (Setting before shipment is unit 0.)

1 234

DSW1 Ref. System No. Setting

When H-Link is used, setting is required.

No.0 Unit Setting Condition

Set the unit number of outdoor unit at each refrigerant cycle. (Setting before shipment is unit 0.)

DSW4 Trial/Service 1

This dip switch is used when trial or servicing operation is performed.

1 234

DSW2 Capacity Setting

Each outdoor unit is set as shown below before shipment.

5HP O.U.

1 234

8HP O.U.

1 234

16HP O.U.

1 234

20HP O.U.

1 234

10HP O.U.

NSR

1 234

DSW2 Capacity Setting

RAS-8FXG

RAS-8FX3

1 234

RAS-10FXG

1 234

B.S.

1 23456

Cooling

1 23456

Heating

1 23456

Enforced Comp. Stop

1 2345678

DSW5 Option Function 1

Set the dip switch according to your requirements.

B.S.

380V/50Hz

Setting Item Pin No.

#1 #2 #3 #4 #5Defrosting Condition Change for Cold Area

Circulator Function of Heating Thermo-OFF Night Shift (Low Noise) Cancellation of Outdoor Ambient Temp. Limit of Heating Cancellation of Outdoor Ambient Temp. Limit of Cooling

Power Supply #7 #8

1 234

RAS-10FX3

NSR

DSW3 Height Difference

* The O.U. is located higher than I. U.

(0 to 50m)

* The O.U. is located lower than I.U.

(0 to 20m)

* The O.U. is located lower than I.U.

(20 to 40m)

B.S.

DSW3 Height Difference

* The O.U. is located

higher than I. U. (0 to 20m)

* The O.U. is located

higher than I. U. (20 to 50m)

* The O.U. is located

lower than I. U. (0 to 20m)

* The O.U. is located

lower than I. U. (20 to 40m)

DSW6 Piping Length

B.S.

0 to 25m 25 to 50m

50 to 75m

75 to 100m

415V/50Hz 380V/60Hz 220V/60Hz

: ON : OFF

1 234

Set the pin at the ON side at emergency operation.

B.S.

NSR NSR

DSW8 Trial/Service 2

B.S.

Exchanged

Compressor Operation

DSW10 Transmitting

B.S.

Cancellation of

Te r minal Resistance

when fuse

is melted

DSW7

Comp. Emergency Operation

B.S.: Before Shipment, NSR: No Setting is Required, SR: Setting Required

NSR

DSW9

Option Function 2

Setting Item Pin No.

#1 #2

Except No.1 Comp. Operation Except No.2 Comp. Operation

Except No.3 Comp. Operation

Except No.4 Comp. Operation

Manual Defrosting

for Checks

PSW1

PSW2 PSW3

Push Switch

DSW6

DSW1

DSW10

DSW2 DSW3 DSW4 DSW5

DSW7 DSW8 DSW9 PSW1 PSW2 PSW3

Dip Switch Arrangement

SEG2 SEG1

Page 14

1-4

TROUBLESHOOTING

1 234

DSW1 Ref. System No. Setting

When H-Link is used, setting is required.

No.0 Unit Setting Condition

Set the unit number of outdoor unit at each refrigerant cycle. (Setting before shipment is unit 0.)

1 234

DSW2 Capacity Setting

RAS-24FSG1 RAS-24FS5

RAS-30FSG1 RAS-30FS5

1 234

NSR

1 23456

DSW4

B.S.

1 23456

Cooling

1 23456

Heating

1 23456

Enforced Compressor Stop

1 23456

Except No.1 Compressor Operation

DSW3 Height Difference

* The O.U. is located higher than I. U.

(0 to 50m)

* The O.U. is located lower than I.U.

(0 to 20m)

* The O.U. is located lower than I.U.

(20 to 40m)

B.S.

DSW6 Piping Length

B.S.

0 to 25m 25 to 50m

50 to 75m

75 to 120m

1 2345678

DSW5 Option Function 1

B.S.

Setting Item Pin No.

#1 #2 #3 #4 #5Defrosting Condition Change for Cold Area #8Combination of Indoor Units are more than 16

Circulator Function of Heating Thermo-OFF Night Shift (Low Noise) Cancellation of Outdoor Ambient Temp. Limit of Heating Cancellation of Outdoor Ambient Temp. Limit of Cooling

1 234

Set the pin at the ON side at emergency operation.

B.S.

NSR NSR

DSW8

Tr ial/Service 2

Tr ial/Service 1

B.S.

Exchanged

Compressor Operation

DSW10

Tr ansmitting

B.S.

Cancellation of

End Resistance

Short Circuit

of Fuse

DSW7

Comp. Emergency Operation

B.S.: Before Shipment, NSR: No Setting is Required, SR: Setting Required

Setting Item Pin No.

#1 #2

Except No.2 Comp. Operation Except No.3 Comp. Operation

Except No.4 Comp. Operation

Except No.5 Comp. Operation

Setting Item Pin No.

Power Supply (415V: ON, 380V and 220V: OFF)

Power Supply (220V: ON, 380V and 415V: OFF)

1 234

B.S.

DSW9

Optional Function 2

Manual Defrosting

for Checks

PSW1

PSW2 PSW3

Push Switch

DSW1 DSW2 DSW3 PSW1 PSW2 PSW3

DSW6 DSW7 DSW8 DSW9

DSW4 DSW5

Dip Switch Arrangement

SEG2 SEG1

Each outdoor unit is set as shown below before shipment.

This dip switch is used when trial or servicing operation is performed.

Set the dip switch according to your requirements.

Page 15

1-5

TROUBLESHOOTING

123456

OFF

DSW2

OFF

DSW5

Factory Setting Position (Dip Switch)

DSW2

PCB2

DSW5

b. Setting of Dip Switches

The dip switches are set before shipment and no setting in the field is required. These are utilized for the self-diagnosis of PCB.

(3) CH Unit (For FX Series Only)

Before setting dip switches, firstly turn OFF power source and set the position of the dip switches. If the dip switches are set without turning OFF the power source, the switches can not function.

The “■” mark indicates position of dip switches. The figures below show the setting before shipment.

a. Position of Dip Switches

The PCB2 in the electrical box of CH unit is equipped with 2 types of dip switches (DSW2, DSW5), as shown in the figure below.

NOTE

1.1.2 Checking of Electrical Wiring  Check to ensure that the terminal for power source wiring (terminals “L1” to “L1” and “N” to “N” of

each terminal board: AC380-415V, terminals “R” to “R” and “T” to “T” of each terminal board: AC220V) and intermediate wiring (Operating Line: terminals “1” to “1” and “2” to “2” of each terminal board: DC5V) between the indoor unit and the outdoor unit coincide correctly, as figure below. If not, some component will be damaged.

 Check to ensure that the twist pair cable with shield (≥0.75mm2) are used for intermediate wiring to

protect noise obstacle at total length of less than 1000m and size complied with local code.

 Check to ensure that the wirings and the breakers are chosen correctly, as shown in Table 1.1. and

1.2.

 All the field wiring and equipment must comply with local code.

Page 16

1-6

TROUBLESHOOTING

Example for Electrical Wiring Connection of FSG, FS3, FSG1 and FS5 System

Outdoor Unit (5 to 20HP) <380-415V/50Hz, 380V/60Hz>

No. 0 System Indoor Units (Max. 16 Units per Refrigerant Cycle)

Remote Control Cable (Shielded Twist Pair Cable) *1

Remote Control Switch (PC-P1H)

No.1 System Indoor Units

Max. 4 Units / Power Supply Line (5, 8 and 10HP) 1 Outdoor Unit / Power Supply Line (16 and 20 HP)

TB1

Outdoor Unit RAS-5FS3

RAS-8FS3 RAS-10FS3 RAS-16FS3 RAS-20FS3 RAS-5FSG RAS-8FSG RAS-10FSG RAS-16FSG RAS-20FSG

ELB

FUSE

Main Switch

3N 380V/50 Hz 415V/50 Hz 415V/60 Hz

1N (3N ) 220V/50 Hz 240V/50 Hz 220V/50 Hz

ELB

No. 0 System Outdoor Unit

TB1 TB2

L1 L2 L3 N 1 2

No. 1 System Outdoor Unit

TB1 TB2

L1 L2 L3 N 1 2

No. 3 System Outdoor Unit

TB1 TB2

L1 L2 L3 N 1 2

Operating Line (Shielded Twist Pair Cable) DC5V (Non-Pole Transmission H-LINK System)

*1: When installing PC-P1H remote control switch in Australia, connect the both ends of shield tube to earth. *2: It is need for China and Australia only.

Operating Line (Shielded Twist Pair Cable) DC5V (Non-Pole Transmission H-LINK System)

12AB

TB2

12AB

TB2

TB1

L1 L2 N L1 L2 N

No. 0 Indoor Unit

No. 1 Indoor Unit

Distribution Box or Pull Box *2

TB : Terminal Board PCB : Printed Circuit Board : Field Wiring : Field Supplied : Optional Accessory

No. 0 System Indoor Units (Max. 27 Units per Refrigerant Cycle...RAS-24FSG1, RAS-24FS5 Max. 32 Units per Refrigerant Cycle...RAS-30FSG1, RAS-30FS5)

Remote Control Cable (Shielded Twist Pair Cable) *1

Remote Control Switch (PC-P1H)

*1: When installing PC-P1H remote control switch in Australia, connect the both ends of shield tube to earth. *2: It is need for China and Australia only.

No.1 System Indoor Units

Outdoor Unit RAS-5FS3

RAS-8FS3 RAS-10FS3 RAS-16FS3 RAS-20FS3 RAS-5FSG RAS-8FSG RAS-10FSG RAS-16FSG RAS-20FSG

TB1

ELB

FUSE

Main Switch

3 220V/60Hz

1 220V/60 Hz

ELB

No. 0 System Outdoor Unit

TB1 TB2

RS T 1 2

No. 1 System Outdoor Unit

TB1 TB2

RS T 1 2

No. 3 System Outdoor Unit

TB1 TB2

RS T 1 2

Operating Line (Shielded Twist Pair Cable) DC5V (Non-Pole Transmission H-LINK System)

12AB

TB2

12AB

TB2

TB1

L1 L2 N L1 L2 N

No. 0 Indoor Unit

No. 1 Indoor Unit

TB : Terminal Board PCB : Printed Circuit Board : Field Wiring : Field Supplied : Optional Accessory

Distribution Box or Pull Box *2

<220V/60Hz>

Page 17

1-7

TROUBLESHOOTING

Outdoor Unit (24 and 30HP) <380-415V/50Hz, 380V/60Hz>

No. 0 System Indoor Units (Max. 27 Units per Refrigerant Cycle...RAS-24FSG1, RAS-24FS5 Max. 32 Units per Refrigerant Cycle...RAS-30FSG1, RAS-30FS5)

Remote Control Cable (Shielded Twist Pair Cable) *1

Remote Control Switch (PC-P1H)

TB1

Outdoor Unit RAS-24FSG1

RAS-30FSG1 RAS-24FS5 RAS-30FS5

ELB

FUSE

Main Switch

3N 380V/50 Hz 415V/50 Hz 415V/60 Hz

1N (3N ) 220V/50 Hz 240V/50 Hz 220V/50 Hz

ELB

No. 0 System Outdoor Unit

TB1 TB2

L1 L2 L3 N 1 2

Operating Line (Shielded Twist Pair Cable) DC5V (Non-Pole Transmission H-LINK System)

*1: When installing PC-P1H remote control switch in Australia, connect the both ends of shield tube to earth. *2: It is need for China and Australia only.

Operating Line (Shielded Twist Pair Cable) DC5V (Non-Pole Transmission H-LINK System)

12AB

TB2

12AB

TB2

TB1

L1 L2 N L1 L2 N

No. 0 Indoor Unit

No. 1 Indoor Unit

Distribution Box or Pull Box *2

TB : Ter minal Board PCB : Printed Circuit Board : Field Wiring : Field Supplied : Optional Accessory

No. 0 System Indoor Units (Max. 27 Units per Refrigerant Cycle...RAS-24FSG1, RAS-24FS5 Max. 32 Units per Refrigerant Cycle...RAS-30FSG1, RAS-30FS5)

Remote Control Cable (Shielded Twist Pair Cable) *1

Remote Control Switch (PC-P1H)

*1: When installing PC-P1H remote control switch in Australia, connect the both ends of shield tube to earth. *2: It is need for China and Australia only.

TB1

Outdoor Unit RAS-24FSG1

RAS-30FSG1 RAS-24FS5 RAS-30FS5

ELB

FUSE

Main Switch

3 220V/60Hz

1 220V/60 Hz

ELB

No. 0 System Outdoor Unit

TB1 TB2

RS T 12

Operating Line (Shielded Twist Pair Cable) DC5V (Non-Pole Transmission H-LINK System)

12AB

TB2

12AB

TB2

TB1

L1 L2 N L1 L2 N

No. 0 Indoor Unit

No. 1 Indoor Unit

TB : Ter minal Board PCB : Printed Circuit Board : Field Wiring : Field Supplied : Optional Accessory

Distribution Box or Pull Box *2

<220V/60Hz>

Page 18

1-8

TROUBLESHOOTING

Table 1.1 Electrical Data and Recommended Wiring, Breaker Size/1 Outdoor Unit <FS Series>

NOTE: Regarding the wiring or breakers, follow to the local code.

Nominal

Current

Nominal

Sensitive

Current

(A)

(φmm) (A) (mA) (A)

RAS-5FSG RAS-5FS3

18 MLFC 0.75SQ 20 20

RAS-8FSG RAS-8FS3

28 MLFC 2SQ

RAS-10FSG RAS-10FS3

35 MLFC 3.5SQ

RAS-16FSG RAS-16FS3

57 MLFC 5.5SQ

>57

(Ex. 100)

100

RAS-20FSG RAS-20FS3

71 MLFC 8SQ

>71

(Ex. 100)

100

RAS-24FSG1 RAS-24FS5

74 MLFC 8SQ 100 80

RAS-30FSG1 RAS-30FS5

87 MLFC 14SQ 120 100

RAS-5FSG RAS-5FS3

18 MLFC 0.75SQ 20 20

RAS-8FSG RAS-8FS3

30 MLFC 2SQ 30 30

RAS-10FSG RAS-10FS3

36 MLFC 3.5SQ 40 40

RAS-16FSG RAS-16FS3

58 MLFC 5.5SQ 60 60

RAS-20FSG RAS-20FS3

72 MLFC 8SQ 75 75

RAS-24FSG1 RAS-24FS5

77 MLFC 8SQ 100 80

RAS-30FSG1 RAS-30FS5

90 MLFC 14SQ 120 100

RAS-5FSG RAS-5FS3

27 MLFC 2SQ 30 30

RAS-8FSG RAS-8FS3

45 MLFC 3.5SQ 50

RAS-10FSG RAS-10FS3

55 MLFC 5.5SQ 60

RAS-16FSG RAS-16FS3

88 MLFC 14SQ 100 100

RAS-20FSG RAS-20FS3

112 MLFC 14SQ 120 125

RAS-24FSG1 RAS-24FS5

132 MLFC 22SQ 150 150

RAS-30FSG1 RAS-30FS5

141 MLFC 22SQ 150 150

ELB: Earth Leakage Breaker MLFC: Flame Retardant Polyflex Wire

100

380-415V

/50Hz

Model

Power

Supply

ELB

Fuse

Power

Supply

Line

Max.

Running

Current

220V/60Hz

100

380V/60Hz

Page 19

1-9

TROUBLESHOOTING

Example for Electrical Wiring Connection of FXG and FX3 System

Table 1.2 Electrical Data and Recommended Wiring, Breaker Size/1 Outdoor Unit <FX Series>

NOTE: Regarding the wiring or breakers, follow to the local code.

Nominal

Current

Nominal

Sensitive

Current

(A)

(φmm) (A) (mA) (A)

RAS-8FXG RAS-8FX3

32 MLFC 2SQ

RAS-10FXG RAS-10FX3

35 MLFC 3.5SQ

ELB: Earth Leakage Breaker MLFC: Flame Retardant Polyflex Wire

380-415V

/50Hz

40 30 40

Model

Power

Supply

ELB

Fuse

Power

Supply

Line

Max.

Running

Current

No. 0 System Indoor Units (Max. 16 Units per Refrigerant Cycle)

Remote Control Cable (Shielded Twist Pair Cable) *1

Remote Control Switch (PC-P1H)

No.1 System Indoor Units

Max. 4 Units / Power Supply Line

No. 0 Group CH Unit

No. 1 Group CH Unit

No. 1 System CH Units

TB1

Outdoor Unit RAS-8FXG

RAS-8FX3 RAS-10FXG RAS-10FX3

ELB

FUSE

Main Switch

3N 380V/50 Hz 415V/50 Hz 415V/60 Hz

1N (3N ) 220V/50 Hz 240V/50 Hz 220V/50 Hz

ELB

No. 0 System Outdoor Unit

TB1 TB2

L1 L2 L3 N 1 2

No. 1 System Outdoor Unit

TB1 TB2

L1 L2 L3 N 1 2

No. 3 System Outdoor Unit

TB1 TB2

L1 L2 L3 N 1 2

Operating Line (Shielded Twist Pair Cable) DC5V (Non-Pole Transmission H-LINK System)

*1: When installing PC-P1H remote control switch in Australia, connect the both ends of shield tube to earth. *2: It is need for China and Australia only.

Operating Line (Shielded Twist Pair Cable) DC5V (Non-Pole Transmission H-LINK System)

12AB

TB2

12AB

TB2

TB1

L1 L2 N L1 L2 N

No. 0 Indoor Unit

No. 1 Indoor Unit

Distribution Box or Pull Box *2

TB : Terminal Board PCB : Printed Circuit Board : Field Wiring : Field Supplied : Optional Accessory

Page 20

1-10

TROUBLESHOOTING

1  Turn on All Indoor Units  All the Indoor Units Connected to the Outdoor Unit

During auto-addressing, the following items can be checked using the outdoor unit's on-board 7-segment LED display. (1) Disconnection of power supply to the indoor unit. (2) Reverse connection of the operating line between the outdoor and

indoor units. In this case, "03" appears after 30 seconds.

(3) Duplication of indoor unit number. See Alarm Code 35.

Outdoor Unit Printed Circuit Board PCB1

2 Turn on the Outdoor Unit

3 Auto-addressing Starts

Normal Case

(1) The outdoor unit's on-board 7-segment LED display is not indicated.

continues to flash after 30 seconds.

Abnormal Case

(2) The outdoor unit's on-board 7-segment LED display indicates as follows if there is something wrong.

(A) The indoor units are not

supplied with power.

(B) Disconnection of the

operating line between the outdoor and indoor units.

alarm code "35", in the item 1.2.2, "Troubleshooting by Alarm Code".)

continues to flash after 30 seconds.

1.1.3 Checking by 7-Segment Display

(1) Simple Checking by 7-Segment Display

Page 21

1-11

TROUBLESHOOTING

1.1.4 Emergency Operation when Inverter Compressor is Damaged (1) Failure of Inverter Compressor

a. Contents of Operation

(Applied Models: RAS-8FSG(3), 10FSG(3), 16FSG(3), 20FSG(3), 24FSG1(5), 30FSG1(5) / RAS-8FXG(3), 10FXG(3))

* This operation is an emergency operation by a constant compressor, when the inverter

compressor is failed.

* By turning ON “#1” of DSW7 on PCB1 and “#1” of DSW1 on PCB3, emergency operation is

started. (In Case of 5 to 20HP)

* By turning ON “#6” of DSW4 on PCB1 and “#1” of DSW1 on ISPM, emergency operation is

started. (In Case of 24 and 30HP)

* Control of the emergency operation is same with normal control except the inverter compressor

stoppage.

b. Operating Condition

The constant speed compressor is forced to be stopped for compressor protection under the condition below.

Total Capacity of Thermo-ON indoor units < 50% of Outdoor Unit Capacity In case of the above condition, the compressor is operated and stopped repeatedly, and it may cause the compressor failure. Therefore, the compressor is forced to be stopped to protect it. NOTE: If the printed circuit board for inverter (PCB3) is damaged, this is not available. Setting airflow of indoor unit is keeping during enforced stoppage. Therefore, it is recommended that setting airflow is “Lo” to avoid the person in the room feels cold.

c. Method of Emergency Operation

Checking Before Emergency Operation.

* Measure insulation resistance of the inverter compressor.

Do not perform the emergency operation when the insulation resistance is 0Ω. There is a possibility that refrigerant oil may be oxidized, if the emergency operation is performed, the other compressor is damaged.

* In case of total capacity of Thermo-ON indoor units are more than 50% of outdoor unit capacity,

emergency operation is available.

* In this emergency operation, frequency of the compressor is not controlled at each 1Hz.

Therefore, alarm code “07”, “43”, “44”, “45” or “47” may be indicated on LCD. Details of alarm

codes are shown in the alarm code table (page 1-23). * This emergency operation does not provide sufficient cooling and heating capacity. * This method is an emergency operation temporarily when the inverter compressor is damaged.

Therefore, change the new one as soon as possible. *Turn OFF “#1” of DSW7 on PCB1 and “#1” of DSW1 on PCB3 after changing the new

compressor. (In Case of 5 to 20HP)

Turn OFF “#6” of DSW4 on PCB1 and “#1” of DSW1 on ISPM after changing the new

compressor. (In Case of 24 and 30HP)

If this setting is not performed, the inverter compressor will be damaged.

d. Emergency Operation

*Turn OFF all the power source switches. * Disconnect the wiring from the inverter compressor. Insulate the faston terminals for inverter

compressor wires by insulation tape. * Set the No.1 of DSW7 on the PCB1 and No.1 of DSW1 on the PCB3 at the “ON” side.

(In Case of 5 to 20HP)

Set “#6” of DSW4 on PCB1 and “#1” of DSW1 on ISPM at the “ON” side.

(In Case of 24 and 30HP) *Turn ON all the power source switches. * Operate the system by remote control switches. * The system is stopped by turning OFF all the remote control switches or turning OFF all the

power source switches.

Page 22

1-12

TROUBLESHOOTING

(2) Failure of Constant Speed Compressor

a. Contents of Operation

(Applied Models: RAS-8FSG(3), 10FSG(3), 16FSG(3), 20FSG(3), 24FSG1(5), 30FSG1(5) / RAS-8FXG(3), 10FXG(3))

* This operation is an emergency operation by the inverter compressor, when the constant speed

compressor is failed. * This operation is controlled by a normal control.

b. Operating Condition

* Set the No.2, 3 or 4 of DSW7 on the PCB1 at the “ON” side. (In case of 5 to 20HP) * Set the No.1, 2, 3 or 4 of DSW7 on the PCB1 at the “ON” side. (In case of 24 and 30HP) *Temperature of THM2, THM3 and THM4 on the top of compressors are not ignored by setting

DSW7.

If the thermistor is short-circuited or cut, this operation is available.

Page 23

1-13

TROUBLESHOOTING

Cause

Check Item

Action

(Turn OFF Main Switch)

Measure voltage by volt-meter.

Supply power.

Phenomenon

Short Circuit Supplied between Wires

Melted Fuse or Activation of Breaker at Power Source

Power Failure or Power is Not ON

Check for any uncovered part of wires.

Remove the cause of short-circuit and replace the fuse.

Short Circuit of Wires to Earth

Remove the cause of short-circuit and replace the fuse.

Failure of Indoor Unit Fan Motor

Measure resistance between wires and insulation resistance.

Replace the AC chopper for indoor fan, fan motor and fuse.

Failure of AC Chopper for Indoor Fan

Replace the AC chopper for indoor fan and fuse.

Replace the AC chopper for indoor fan, fan motor and fuse.

Replace the AC chopper for indoor fan and fuse.

Short Circuit Supplied between Wires

Melted Fuse at Control Circuit

Check for any uncovered part of wires.

Remove the cause of short-circuit and replace the fuse.

Short Circuit of Control Circuit to Earth

Measure insulation resistance.

Remove the cause of short-circuit and replace the fuse.

Failure of Indoor Unit Fan Motor

Measure resistance between wiring and insulation resistance.

Failure of AC Chopper for Indoor Fan

Measure voltage at secondary side.

Replace the transformer.

Failure of Transformer at Indoor Unit Side

Connect the cable.

Replace cable or repair it.

Disconnected Cable of Remote Control Switch

Insufficient Connection or Incorrect Connection of Indoor Unit PCB

Insufficient Contacting at Connectors of Remote Control Switch

Check connectors. Correctly connect it.

Insufficient Connection or Incorrect Connection of PCB in Remote Control Switch

1.1.5 Failure of Power Supply to Indoor Unit and Remote Control Switch

 Lights and LCD are not Indicated.  Not Operated

If fuses are melted or a breaker is activated, investigate the cause of over current and take necessary action.

Page 24

1-14

TROUBLESHOOTING

Cause

Check Item

Action

(Turn OFF Main Switch)

Check cable and connections.

Repair cable or connect it.

Phenomenon

Disconnection or Insufficient Contacting of Remote Control Cable

Check wiring and connections.

Repairing

Incorrect Wiring Connection (Incorrect Polarity)

Failure of Remote Control Switch

Check it by self-checking mode *1).

Check it by self-checking mode *2).

Replace it if remote control switch is faulty.

Check connectors.

Correctly connect wires.

Replace PCB if failed.

Disconnected Wire to PCB

Failure of PCB (in Indoor Unit and Remote Control Switch)

Failure of PCB

Failure of Remote Control Switch

Check it by self-checking mode *1).

Check it by self-checking mode *2).

Replace remote control switch if failed.

Check connectors.

Correctly connect wires.

Replace PCB if failed.

Take action according to the procedure indicated in "TEST RUN".

Incorrect Wiring Connection

Unconnected Wires to PCB

Failure of PCB

(1.1.5 Failure of Power Supply to Indoor Unit and Remote Control Switch)

1.1.6 Abnormal Transmission between Remote Control Switch and Indoor Unit  “RUN” Lamp on Remote Control Switch:

Flickering every 2 seconds

*1): Refer to Item 1.3.2. *2): Refer to Item 1.3.1.

*1): Refer to Item 1.3.2. *2): Refer to Item 1.3.1. *3): This phenomenon occurs when the system is newly installed and is started within 5 minutes after power supply,

since automatic setting of unit No. is performed during this period.

Page 25

1-15

TROUBLESHOOTING

Cause

Check Item

Action

(Turn OFF Main Switch)

Phenomenon

Measure coil resistance by tester.

Replace indoor unit fan motor.

Failure of Indoor Unit Fan Motor

Disconnected Coil

"RUN" light is ON and LCD is indicated. However, the system does not operated.

(ex. The indoor, outdoor fans or compressor does not operate.)

The Comp. does not Stop or Start even if the Setting temperature on LCD is Changed *3)

Measure insulation resistance.

Burnt-Out Coil

Measure coil resistance by tester.

Replace outdoor unit fan motor.

Failure of Outdoor Unit Fan Motor

Disconnected Coil

Measure insulation resistance.

Burnt-Out Coil

Check connections.

Failure of One of PCBs

Disconnected Wiring to PCB

Check PCB by self-checking *1).

Correctly connect wiring.

Replace PCB if failed.

Check it by self-checking *1).

Check it by Check Mode *2).

Failure of PCB

Replace or correctly connect wires if abnormality exists.

Failure of Air Inlet Thermistor

Failure of Thermistor

Disconnection of Thermistor

Measure voltage between contacting parts.

Replace PCB for outdoor unit.

Failure of Magnetic Switch for Outdoor Unit Fan Motor

Insufficient Contacting

Check magnetic switch activates correctly or not.

Replace magnetic switch.

Replace PCB if failed.

Failure of Magnetic Switch for Comp.

Insufficient Contacting

Measure resistance between two wires.

Replace compressor.

Failure of Comp. Motor

Check for abnormal sound from comp.

Failure of Comp.

Abnormality of Remote Control Switch Cord

Check it by Test Run.

Failure of Indoor Unit PCB

1.1.7 Abnormalities of Devices

In the case that no abnormality (Alarm Code) is indicated on the remote control switch, and normal operation is not available, take necessary action according to the procedures mentioned below.

Page 26

1-16

TROUBLESHOOTING

Incorrect Optional Setting

The Comp. does not Stop or Start even if the Setting temperature on LCD is Changed *3)

Check Setting Condition of "Thermistor of Remote Control Switch" by Optional Setting

* Setting and Control "00": Control by Indoor

Thermistor for Suction Air

"01": Control by

Thermistor of Remote Control Switch

"02": Control by

Average Value of Indoor Thermistor for Suction Air and Thermistor of Remote Control Switch

In case that thermistor of remote control switch is not used, set at "00".

Incorrect Input/Output Setting

Check Setting Condition of "i1" and "i2" by Input/Output Setting

* Setting and Control "01": Room Thermostat

(Cooling)

"02": Room Thermostat

(Heating)

In case that room thermostat is not used, set for input signal actually used. If no signal is used, set at "00".

Cause

Check Item

Action

(Turn OFF Main Switch)

Phenomenon

(1.1.7 Abnormalities of Devices)

*1): Refer to Item 1.3.1 to 1.3.4. *2): Refer to Item 1.2.3. *3): Even if controllers are normal, the compressor does not operate under the following conditions.

* Indoor Air Temp. is lower than -21°C or Outdoor Air Temp. is lower than -5°C during cooling operation. * Indoor Air Temp. is higher than 30°C or Outdoor Air Temp. is higher than 23°C during heating operation. * When a cooling (or heating) operation signal is given to the outdoor unit and a different mode as heating

(or cooling) operation signal is given to indoor units.

* When an emergency stop signal is given to outdoor unit.

Page 27

1-17

TROUBLESHOOTING

Cause

Check Item

Action

(Turn OFF Main Switch)

Phenomenon

Check thermistor by self-checking *2).

Replace or correctly connect wiring when it is abnormal.

Check it by self-checking *1).

Check the indoor unit stoppage when the remote control switch is switched OFF.

Failure of Discharge Air Temp. Thermistor

Failure of Thermistor

Indoor Fan Speed is Not Changed

No Defrosting Operation Mode is Available during Heating Operation or Defrosting Operation is Continued

Light and LCD Indication on Remote Control Switch are Kept ON

Disconnected Wire of Thermistor

Failure of Thermistor for Outdoor Evaporating Temp. during Heating

Failure of Thermistor

Replace of correctly connect when it is abnormal.

Replace if failed.

Replace if PCB is failed.

Disconnected Wire of Thermistor

Measure resistance of coil.

Failure of 4-Way Valve

Disconnected 4-Way Valve Coil

Enforced power supply.

Replace 4-Way valve.

Incorrect Activation of 4-Way Valve

Check connectors.

Failure of Outdoor Unit PCB

Disconnected Wires to PCB

Correctly connect wiring.

Replace it when check mode is not available.

Failure of PCB

Check PCB by self-checking *1).

Check connectors.

Failure of Indoor Unit PCB

Disconnected Wires to PCB

Correctly connect wiring.

Replace if PCB is failed.

Failure of PCB

Failure of Remote Control Switch

Failure of PCB for Indoor Unit

Replace if AC Chopper is failed.

Failure of AC Chopper for Indoor Unit

Check connectors.

Correctly connect wiring.

Disconnected Control Wires between Indoor Unit and Outdoor Unit and CH Unit

Failure of PCB in Indoor Unit or Remote Control Switch

(1.1.7 Abnormalities of Devices)

*1): Refer to Item 1.3.1 to 1.3.4. *2): Refer to Item 1.3.1.

Page 28

1-18

TROUBLESHOOTING

Cause

Check Item

Action

(Turn OFF Main Switch)

Phenomenon

Measure superheat.

Correctly charge refrigerant after repairing gas leakage.

Measure and check field-supplied pipes.

Use correct pipes.

Excessively Low Suction Pressure

Gas Leakage or Shortage of Refrigerant

Insufficient Cooling Operation

Excessively Small Diameter Tube or Long Piping

Check whether or not temp. difference exists before/after check valve.

Replace check valve for outdoor unit.

Incorrect Activation of Check Valve of Outdoor Unit

Is there dewing after capillary tube?

Replace capillary tube in CH Unit.

Clogged Capillary Tube in CH Unit

Check temp. difference. Remove clogging.

Clogging at Low Pressure Piping

Insufficient Air Flow to Indoor Unit Heat Exchanger

Check temp. difference at inlet and outlet of strainer.

Replace strainer in indoor unit.

Clogged Strainer in Indoor Unit or CH Unit Clogging at Low Pressure Piping

Check for clogging. Remove clogging.

Check for connection cord and connector.

Replace connector.

Check for clogged air filter.

Clean air filter.

Check for obstacle at inlet or outlet.

Remove obstacles.

Excessively Low Air Temp. to Indoor Unit Heat Exchanger

Insufficient revolution of indoor unit fan motor?

Replace fan motor.

Check Short-circuited indoor unit air.

Remove cause of short-circuited air.

Is there operation sound from coil?

Replace coil.

Is thermistor on compressor normal?

Replace thermistor.

Is thermistor installed correctly on compressor?

Correctly install it.

Failure or Malfunction of Expansion Valve

Calculate heat load. Use a bigger unit.

Indoor Heat Load is Greater than Cooling Capacity

(1.1.7 Abnormalities of Devices)

Page 29

1-19

TROUBLESHOOTING

Cause

Check Item

Action

(Turn OFF Main Switch)

Phenomenon

Excessively High Discharge Pressure

Insufficient Cooling Operation

Check expansion valve opening.

Correctly charge refrigerant.

Excessively Charged Refrigerant

Excessively High Air Temp. to Outdoor Unit Heat Exchanger

Check each temp. and pressure.

Charge refrigerant after vacuum pumping.

NonCondensed Gas in Cycle

Check for clogging. Remove clogging.

Clogging of Discharge Piping

Check Clogging of Outdoor Unit Heat Exchanger.

Remove clogging.

Obstacles at inlet or outlet of outdoor unit heat exchanger?

Remove obstacles.

Short-Circuited Air to Outdoor Unit?

Remove cause of short-circuited air.

Any Other Heat Load near Outdoor Unit?

Remove heat source.

Is service space for outdoor unit sufficient?

Secure service space.

Correct Fan Speed? Replace fan motor.

Insufficient Air Flow to Outdoor Unit Heat Exchanger

Check for clogging. Remove clogging.

Check for connecting cord and connector.

Replace connector.

Is there operation sound from coil?

Replace coil.

Is thermistor on compressor normal?

Replace thermistor.

Is thermistor installed correctly on compressor?

Correctly install it.

Failure or Malfunction of Expansion Valve

Check temp. difference between inlet and outlet of 4-way valve.

Check for leakage of solenoid valve.

Excessively Low Suction Pressure

Failure of Bypass Solenoid Valve

Replace solenoid valve.

Replace failed expansion valve of indoor unit.

Replace 4-way valve.

Malfunction or Internal Leakage of 4-Way Valve

Check temp. difference at inlet and outlet of 4-way valve.

Replace 4-way valve.

Malfunction or Internal Leakage of 4-Way Valve

Check for expansion valve of indoor unit in the same system.

Discharge Temp. of Indoor Unit is Unstable.

(1.1.7 Abnormalities of Devices)

Page 30

1-20

TROUBLESHOOTING

Cause

Check Item

Action

(Turn OFF Main Switch)

Phenomenon

Excessively Low Suction Pressure

Insufficient Heating Operation

Measure superheat.

Correctly charge refrigerant after gas leakage check and repairing.

Gas Leakage or Insufficient Refrigerant Charge

Check temp. difference of each part.

Remove clogging.

Clogging of Suction Piping

Check temp. difference between inlet and outlet of strainer.

Replace strainer for outdoor unit, indoor unit or CH unit.

Clogging of Indoor Unit/ CH Unit/ Outdoor Unit Strainer

Check thermistor for defrosting.

Replace thermistor for defrosting.

Defrosting is Insufficiently Completed

Check for any short-circuited air to outdoor unit.

Remove cause of short-circuited air.

Excessively Low Air Temp. through Outdoor Unit Heat Exchanger

Measure field-supplied piping.

Use specified pipes.

Excessively Small Diameter or Long Piping

Is outdoor unit heat exchanger clogged?

Remove clogging.

Is there any obstacles at inlet or outlet of outdoor unit?

Remove obstacles.

Is service space for outdoor unit sufficient?

Secure sufficient service space.

Check for speed of outdoor unit fan.

Replace fan motor.

Insufficient Air Flow through Outdoor Unit Heat Exchanger

Check for clogging. Remove clogging.

Check for connecting cord and connector.

Replace connector.

Is there operation sound from coil?

Replace coil.

Is thermistor on compressor normal?

Replace thermistor.

Is thermistor installed correctly on compressor?

Correctly install it.

Failure or Malfunction of Expansion Valve

Calculate heat load.

Replace the unit with a bigger unit.

Indoor Heat Load is Greater than Heating Capacity

(1.1.7 Abnormalities of Devices)

Page 31

1-21

TROUBLESHOOTING

Cause

Check Item

Action

(Turn OFF Main Switch)

Phenomenon

Excessively High Discharge Pressure

Insufficient Heating Operation

Check whether or not short-circuited air exists.

Remove cause of short-circuited air.

Excessively High Air Temp. to Indoor Unit Heat Exchanger

Check expansion valve opening.

Correctly charge refrigerant.

Excessively Charged Refrigerant

Check for clogging. Remove clogging.

Clogging of Discharge Pr. Piping

Check refrigerant quantity. *1)

Recharge refrigerant after vacuum pumping.

NonCondensate Gas in Ref. Cycle

Check for filter clogging. Remove clogging.

Check for any obstacles at inlet or outlet of indoor unit.

Remove obstacles.

Check indoor fan speed. Replace fan motor.

Insufficient Air Flow to Indoor Unit Heat Exchanger

Check temp. difference between inlet and outlet of 4-way valve.

Check for leakage of solenoid valve.

Excessively High Suction Pressure

Failure of Bypass Solenoid Valve

Replace solenoid valve.

Replace failed expansion valve of indoor unit.

Replace 4-way valve.

Malfunction or Internal Leakage of 4-Way Valve

Check temp. difference between inlet and outlet of 4-way valve.

Replace 4-way valve.

Malfunction or Internal Leakage of 4-Way Valve

Check temp. difference between inlet and outlet of check valve.

Replace check valve.

Malfunction of Check Valve of Outdoor Unit

Check for expansion valve of indoor unit in the same system.

Discharge Temp. of Indoor Unit is Unstable.

(1.1.7 Abnormalities of Devices)

*1): Refer to TCII, SP2-K03 and SP2-L01.

Page 32

1-22

TROUBLESHOOTING

Cause

Check Item

Action

(Turn OFF Main Switch)

Phenomenon

Cooling or Heating Operation with Abnormal Sound

Outdoor Fan is Not Operated When Compressor is Operated

Abnormal Sound from Inside of Compressor

Replace compressor.

Wear or Breakage of Internal Comp. Parts

Check expansion valve opening.

Check each part is tightly fixed.

Abnormal Sound from Compressor

Faulty Installation

Tightly fix it.

Ensure superheat.

Liquid Ref. Compression

Check resistance. (Oil Heater, Fuse)

Replace oil heater or fuse.

No Heating by Oil Heater

Check it by viewing.

Remove foreign particles.

Foreign Particles Inside of Fan Casing

Check it by viewing.

Adjust position of fan runner.

Indoor Unit Fan Runner is Hitting Casing

Check it by viewing.

Adjust position of propeller fan.

Outdoor Unit Propeller Fan is Hitting Shroud

Check surface of contacts.

Replace magnetic switch.

Hamming Sound from Magnetic Conductor

Check each fixing screws.

Tightly fix it.

Abnormal Vibration of Cabinets

Check obstacles. Remove obstacles.Obstacle at Outdoor Fan

Check wiring.

Connect wiring correctly.

Disconnected Wiring for Indoor Fan

Check AC chopper. Replace AC chopper.Failure of AC Chopper

Wait for switching of 4-Way Valve. (1 to 3 minutes)

In case that 4-Way Valve is not switched, check for insufficient refrigerant.

Watching Condition for Heating Operation

Indoor Fan is Not Operated When Compressor is Operated

Check operation pressure.

Add refrigerant. *1)

Discharge Pressure Does Not Increase Higher than

1.5MPa due to insufficient refrigerant.

(1.1.7 Abnormalities of Devices)

*1): Refer to TCII, SP2-K03 and SP2-L01.

Page 33

1-23

TROUBLESHOOTING

COOL

Indoor Unit Number

Alarm Code

Indicated for a second alternately

MED

A/C

ADDS. RN

ALARM

COOL

Connected No. of Indoor Units

Alarm CodeModel Code

MED

A/C

ALARM

1.2 Troubleshooting Procedure

 Alarm Code Indication of Remote Control Switch

1.2.1 Alarm Code Table

Code No. Category Content of Abnormality Leading Cause

01 Indoor Unit Tripping of Protection Device Failure of Fan Motor, Drain Discharge, PCB, Relay 02 Outdoor Unit Tripping of Protection Device Activation of PSH

03 Transmission

Abnormality between Indoor (or outdoor) and Outdoor (or Indoor)

Incorrect Wiring. Failure of PCB.

Tripping of Fuse. Power Supply OFF. 04 Inverter Abnormality between Inverter and Control PCB Failure in Transmission between PCBs 05 Transmission Abnormality of Power Source Wiring Reverse Phase Incorrect Wiring

06 Voltage Drop

Voltage Drop by Excessively Low or High Voltage to Outdoor Unit

Voltage Drop of Power Supply, Incorrect Wiring or

Insufficient Capacity of Power Supply Wiring

07 Decrease in Discharge Gas Superheat

Excessive Refrigerant Charge, Expansion Valve

Open Lock

08 Increase in Discharge Gas Temperature

Insufficient Refrigerant. Ref. Leakage, Clogging or

Expansion Valve Close Lock 09 Outdoor Unit Tripping of Protection Device Failure of Fan Motor 11 Inlet Air Thermistor 12 Outlet Air Thermistor 13 Freeze Protection Thermistor 14 Gas Piping Thermistor 19 Tripping of Protection Device for Fan Motor Failure of Fan Motor 21 High Pressure Sensor 22 Outdoor Air Thermistor 23 Discharge Gas Thermistor on Comp. 24 Evaporating Thermistor 29 Low Pressure Sensor

30 * Incorrect Wiring Connection

Incorrect Wiring Connection between Outdoor Unit,

CH Unit and Indoor Unit 31 Incorrect Setting of Outdoor and Indoor Unit Incorrect Setting of Capacity Code.

32 Abnormal Transmission of Other Indoor Unit

Failure of Power Supply, PCB in Other Indoor Unit.

Failure of Other Indoor Unit of the Same

Refrigerant Cycle.

35 Incorrect Setting in Indoor/Outdoor Unit No.

Existence of the same Indoor Unit No. in the same

refrigerant cycle.

Abnormality of Protective Circuit in Outdoor Unit

Failure of Indoor Unit PCB. Incorrect Wiring

Connection to PCB in Outdoor Unit

Abnormality of Running Current at Constant Compressor

Overcurrent, Melted Fuse of Failure of Current

Sensor 43 Pressure Ratio Decrease Protection Activating Failure of Compressor, Inverter

44 Low Pressure Increase Protection Activating

Overload to Indoor in Cooling, High Temperature of

Outdoor Air in Heating Expansion Valve Open Lock

45 High Pressure Increase Protection Activating

Overload Operation. Excessive Refrigerant

Clogging of Heat Exchanger 46 High Pressure Decrease Protection Activating Insufficient Refrigerant

47 Low Pressure Decrease Protection Activating

Insufficient Refrigerant. Expansion Valve Close

Lock. Refrigerant Leakage. 51 Abnormality of Current Sensor for Inverter Failure of Sensor on Inverter PCB 52 Overcurrent Protection Activating Overload, Overcurrent, Locked to Compressor

53 IPM Protection Activating

Automatic Stoppage of IPM (Overcurrent, Low

Voltage or Overheating)

54 ** Increase in Inverter Fin Temperature

Abnormal Inverter Fin Thermistor,

Abnormal Outdoor Fan 56 ** Abnormality of Detection for Fan Motor Position Abnormal Detection Circuit of Transmission 57 ** Fan Controller Protection Activating Abnormal Fan Speed 58 ** Abnormality of Fan Controller Overcurrent, Abnormal Fan Controller Fin 59 AC Chopper AC Chopper Circuit Protection Failure of FET, Power Supply, CT for Fan Motor

EE Compressor Compressor Protection

3 Time Occurrence of Alarm Giving Damage to

Compressor within 6 hours

dd *** Transmission Incorrect Wiring between Indoor Units

Incorrect Wiring between Indoor Units and Remote

Control Switch

* : For only FXG and FX3 series. Other code Nos. are common with FSG and FS3 series. ** : For only 24, 30FSG1/FSG5 (220V 60Hz), *** : In case of PC-2H2

Failure of Thermistor, Sensor, Connection

Cycle

Sensor on

Indoor Unit

Sensor on

Outdoor Unit

Failure of Thermistor, Sensor, Connection

Outdoor Fan

Inverter

Pressure

System

Page 34

1-24

TROUBLESHOOTING

* RCI-FSG2, RCD-FSG1, RPI-FSG1 Series:

Is DC12V applied between #2 and GND of CN14?

* RPF-FSG(E), RPFI-FSG(E), RPC-FSG1 Series:

Is DC24V applied both ends of R24?

Activation of Safety Device (such as Float Switch FS) or Incorrect Wiring

Faulty PCB

Yes

Cause

Check Item

Action

(Turn OFF Main Switch)

Phenomenon

Activation of Float Switch

Check continuity when drain level is low.

Check drain pan.

High Drain Level

Faulty Float Switch

Clogging of Drainage

Remove clogged foreign particles.

Replace float switch if faulty.

Fault

Measure resistance by tester.

Repair looseness and replace connector.

Faulty Contacting

Check connections. Repair connection.

Faulty Connection

Check PCB by self-checking *1).

Replace it if faulty.Faulty Indoor Unit PCB

1.2.2 Troubleshooting by Alarm Code

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section,

and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.

 This alarm code is indicated when the contact between #1 and #2 of CN14 is not closed over 120

seconds during the cooling, fan or heating operation.

*1): Refer to TCII, SP2-K03 and SP2-L01.

Alarm Code

Activation of Safety Device in Indoor Unit

THM1 THM2 THM3 THM4 THM5 CN19 CN25

THM1 THM2 THM3 THM4 THM5 THM6

CN1 CN3 CN4 HA CN14

RCI, RCD, RPI, Types

Other Types

LED1 LED2

LED4

CN12

CN9

CN10

CN14

CN13

R24

Page 35

1-25

TROUBLESHOOTING

Does CMC1 ON when starting?

Is Y52C1 of 7-segments ON? (when in check mode "SC")

Does CMC1 turn ON for more than 3 seconds?

Faulty PCB1

Yes

Normal PCB1

Yes

Is the voltage between PCN3 #1 and faston terminal "N" 220V or 240V during Y52C1 ON?

Yes

Is the protective device still operating? (No continuity between #1 and #3 of PCN2 <5 to 20HP>, No continuity between #1 and #3 of PCN2, PCN6, PCN7 and PCN8 <24 and 30HP>

Is PCN3 or PCN2 loosened? (5 to 20HP) Is PCN3, PCN2, PCN16, PCN17 or PCN18 loosened? (24 and 30HP)

Yes

Check activation of the following safety devices. Remove the cause after checking. (1) High Pressure Switch (PSH: 3.0MPa (30 kgf/cm

G) for FS3, FS5 and FX3 Series

3.3MPa (33 kgf/cm

G) for FSG, FSG1 and FXG Series)



Faulty PCB1

No Voltage

Faulty PCB1

Restart after connecting PCN3 or PCN2 correctly. (5 to 20HP) Restart after connecting PCN3, PCN2, PCN16, PCN17 or PCN18 correctly. (24 and 30HP)

Check Wiring Connection Except for PCB1

No (No Voltage)

No (No Looseness)

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section

and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.

 This alarm is indicated when one of safety devices is activated during compressor running.

Alarm Code

Activation of Safety Device in Outdoor Unit

 Check Item

Connector Faston

for CMC1 Terminal 380-415V/50Hz 380V/60Hz

220V/60Hz PCN3 S1

Power Supply

PCN3

Page 36

1-26

TROUBLESHOOTING

Cause

Check Item

Action

(Turn OFF Main Switch)

Phenomenon

Activation of High Pressure Switch due to Excessively High Discharge Pressure

Disconnected of Connector

Repair looseness or reconnect connector.

Fully opened and locked. (see 1-117 page)

Replace expansion valve.

Expansion Valve Trouble

Measure discharge pressure. Check continuity after decreasing of pressure.

Replace it if faulty.

Faulty Pressure Switch

Faulty High Pressure Switch

Measure resistance by tester.

Repair looseness. Replace connector.

Insufficient Contacting

Check connections. Repair connections.

Incorrect Connection

Calculate heat load.

Reduce heat load or use a bigger unit.

Check for hot air near the ceiling (Heating).

Make good circulation.

Check for short circuited air (Heating).

Remove short-circuited air.

Check for other heat source.

Remove heat source.

Excessively High Temp. Air to Indoor Unit Heat Exchanger

Clogging of Heat Exchanger?

Remove clogging.

Check for dust on air filter.

Remove dust.

Check for any obstacles at inlet or outlet of heat exchanger.

Remove obstacles.

Check the service space.

Secure service space.

Check for speed.

Outdoor Fan: Cooling Indoor Fan: Heating

Replace fan motor if faulty.

Insufficient Air Flow to Heat Exchanger (Outdoor Heat Exchanger during Cooling Operation or Indoor Heat Exchanger during Heating Operation)

Page 37

1-27

TROUBLESHOOTING

Cause

Check Item

Action

(Turn OFF Main Switch)

Phenomenon

Activation of High Pressure Switch due to Excessively High Discharge Pressure

Check for clogging.

Replace gas bypass solenoid valve.

Faulty Gas Bypass Solenoid Valve

Check for clogging. Remove clogging.

Check connecting wiring and connectors.

Replace connector.

Check operating sound from coil.

Replace coil.

Check discharge gas thermistor.

Check attaching state of discharge gas thermistor.

Replace thermistor.

Reattach thermistor.

Faulty or Malfunction of Expansion Valve

Check cycle operating temp. and expansion valve opening.

Charge refrigerant correctly.

Overcharged Refrigerant

Check ambient temp. and pressure.

Recharge refrigerant after vacuum pumping.

Mixture of Non-Condensable Gas in Refrigerant Cycle

Check for clogging. Remove clogging.Clogging of Discharge Piping

Check stop valves. Fully open stop valve.

Liquid Line Stop Valve or Gas Line Stop Valve are not in Operation

Check for clogging. Replace check valve.

Clogging of Check Valve

Page 38

1-28

TROUBLESHOOTING

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section,

or the unit No. and alarm code are indicated on the display of the outdoor unit PCB.

 This alarm is indicated when abnormality is maintained for 3 minutes after normal transmitting

between indoor units and outdoor unit, and also abnormality is maintained for 30 seconds after the micro-computer is automatically reset. The alarm is indicated when the abnormal transmitting is maintained for 30 seconds from starting of the outdoor unit.

 Investigate the cause of overcurrent and take necessary action when fuses are melted or the

breaker for the outdoor unit are activated.

 Regarding RCI-FSG2, RCD-FSG1, RPI-FSG1 and RPK-FSGM* Series, non-pole checking is not

required.

Alarm Code

Abnormal Transmitting between Indoor Units and Outdoor Unit

FS SYSTEM

Page 39

1-29

TROUBLESHOOTING

Is LED3 (yellow) on PCB1 ON?

Is PCB1' setting Non-pole operating. *2)

Yes

Is the voltage between faston terminal "R1" and "N" of PCB1 220V or 240V?

Is DSW10-1P

(Terminal Resistance)

on PCB1 ON?

Is LED3 (yellow)

on PCB1 flickering

more than once in

10 seconds?

Is connector (PCN1,

CN1) for transformer

is loosened?

Is LED1 (red) on

PCB1 ON?

Set it correctly.

Remove CN2 of PCB1. *1)

Yes

Is LED3 on PCB1' ON?

Yes

Is LED3 (yellow) on PCB1' flickering more than once in 10 seconds.

Yes

Connect CN2 of PCB1.

Faulty PCB1.

Replace fuse.



Set it correctly.

Faulty PCB1'.

Yes

Plug PCN1 and CN1 correctly.

Check the fuses of

outdoor unit power

supply.

Check wiring between outdoor unit and indoor units or fuse (EF1) for PCB1'.

Does refrigerant system setting between DSW1 on PCB1' and DSW5 on PCB1' correspond?

Yes

Does Alarm occur with all indoor units?

Yes

Faulty PCB1

PCB1: Outdoor Unit Printed Circuit Board PCB1': Indoor Unit Printed Circuit Board

Outdoor Unit

Check other indoor units.

Is the fuse for

PCB1 melted?

Yes

Is LED3 (yellow)

ON even if CN2 of

PCB1' is removed?

YesYes

Indoor Unit

*1): In case that terminal resistance (DSW10-1P) is OFF when H-Link Connection is performed.

Set the terminal resistance to ON when CN2 is removed. Set the terminal resistance to OFF when CN2 is reconnected.

*2): PCB1' Factory Setting for Non-Pole Transmitting

 Check Item

Item Setting Position Power Supply Faston Terminal

SW2 Left Side (New Transmission Side) 380-415V/50Hz

JP1 Short Circuited 380V/60Hz CN2 Transmission Wire Connecting 220V/60Hz between R1 and S1

CN18 Non-Occupied

between R1 and N

Page 40

1-30

TROUBLESHOOTING

Cause

Check Item

Action

(Turn OFF Main Switch)

Phenomenon

Melted Fuse for Power Source or Activation of Outdoor Unit Breaker

Check for breakage of insulation.

Remove short circuit and replace fuse.

Short Circuit between Wires

Measure insulation resistance.

Remove short circuit to ground and replace fuse.

Short Circuited Wire to Ground

Measure voltage by tester.

Supply power.

Power Failure of No Power Supply

Measure resistance between wires and insulation resistance.

Replace comp. and fuse.

Faulty Comp. Motor

Measure resistance between wires and insulation resistance.

Replace outdoor unit fan motor and fuse.

Faulty Outdoor Unit Fan Motor

Replace the AC chopper for outdoor fan and fuse.

Failure of AC Chopper for Outdoor Fan

Melted Fuse for Control Circuit or Activation of Outdoor Unit Breaker

Check for breakage of insulation.

Remove short circuit and replace fuse.

Short Circuit between Wires

Measure insulation resistance.

Remove short circuit and replace fuse.

Short Circuit of Control Circuit (to Ground)

Disconnected Wires Insufficient Contacting or Incorrect Connection

Check continuity of wires. Check for looseness of connection screws. Check terminal Nos.

Replacing wires, repairing, tightening screws and correct wiring.

Between Outdoor Unit and Indoor Unit

Power Source Wiring for Outdoor Unit

Measure resistance of coil.

Replace magnetic switch and fuse.

Faulty Solenoid Coil for Magnetic Switch for Comp. Motor

Measure resistance between wires and insulation resistance.

Replace the AC chopper for outdoor fan, fan motor and fuse.

Failure of Outdoor Unit Fan Motor

Replace the AC chopper for outdoor fan and fuse.

Correctly connect wires.

Replace it if faulty.

Failure of AC Chopper for Outdoor Fan

Faulty PCB (Outdoor Unit, Indoor Unit)

Check connections.

Replacing Wires, Repairing and Tightening Screws

Correctly connect wires.

Check continuity and looseness of connection screws.

Check terminal Nos.

Disconnected Wires to PCB

Faulty PCB

Incorrect Wiring (SW1 Setting and CN2 Connection)

Disconnected Wire Insufficient Contacting

Incorrect Wiring

Page 41

1-31

TROUBLESHOOTING

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section,

or the unit No. and alarm code are indicated on the display of the outdoor unit PCB.

 This alarm is indicated when abnormality is maintained for 3 minutes after normal transmitting

between indoor units, CH units and outdoor unit, and also abnormality is maintained for 30 seconds after the micro-computer is automatically reset. The alarm is indicated when the abnormal transmitting is maintained for 30 seconds from starting of the outdoor unit.

 Investigate the cause of overcurrent and take necessary action when fuses are melted or the

breaker for the outdoor unit are activated.

 Regarding RCI-FSG2, RCD-FSG1, RPI-FSG1 and RPK-FSGM Series, non-pole checking is not

required.

Alarm Code

Abnormal Transmitting between Indoor Units and Outdoor Unit

FX SYSTEM

Page 42

1-32

TROUBLESHOOTING

Is LED3 (yellow) on PCB1 ON?

Is DSW5-1P (End

Terminal Resistance)

of PCB(1) ON?

Yes

Is the voltage between faston terminal "R1" and "N" of PCB1 220V or 240V?

Is DSW10-1P

(Terminal Resistance)

on PCB1 ON? *1)

Is LED3 (yellow)

on PCB1 flickering

more than once in

10 seconds?

Is connector (PCN1,

CN1) for transformer

is loosened?

Is LED1 (red) on

PCB1 ON?

Set it correctly.

Remove CN2 of PCB1. *2)

Yes

Is LED1 (red) on PCB(1) ON?

Yes

Is LED3 (green) on PCB(1) ON?

Yes

Connect CN2 of PCB1.

Yes

Remove CN8 of PCB(1).

To Next Page

Replace fuse.



NoNo

Set it correctly.

Check CH unit wiring.

Yes

Plug PCN1 and CN1

correctly.

Check the fuses of outdoor unit power supply.

Check wiring between outdoor unit and indoor units or fuse (EF3) for PCB(1).

Faulty PCB1

PCB1: Outdoor Unit Printed Circuit Board PCB1': Indoor Unit Printed Circuit Board

Outdoor Unit

Is LED3 (yellow)

on PCB(1) flickering

more than once in

10 seconds?

Is the fuse for

PCB1 melted?

Yes

Is connector (TR,

CN7) for transformer on

PCB(1) is loosened?

Replace fuse.

Check other CH units.

Yes

Plug TR and CN7 correctly.

Is LED3 (green)

still ON after removing

CN9 on PCB(1)?

YesYes

Is the fuse for

PCB(1) melted?

Yes

Is voltage between

"R1" and "N" of PCN1

on PCB(1) 220V

or 240V

Faulty PCB(1)

CH Unit

Page 43

1-33

TROUBLESHOOTING

Is LED3 (yellow) on

PCB1' flickering more than

once in 10 seconds?

Is PCB1' setting Non-pole operating. *3)

Is LED2 (yellow)

on PCB(1) flickering

more than once in

10 seconds?

Is LED2 (yellow)

on PCB(1) ON?

Is LED3 on

PCB1' ON?

Faulty PCB(1)

Yes

Does Alarm occur with

all indoor units?

Yes

Connect CN8 of PCB(1).

Faulty PCB(1)

Faulty PCB1

Set it correctly.

Faulty PCB1'.

No No

Check wiring between outdoor unit and indoor units or fuse (EF1) for PCB1'.

Yes

Does refrigeration system

setting between DSW1

on PCB1' and DSW5

on PCB1' correspond?

Indoor Unit

Are other units in

same condition?

Yes

Check other indoor units.

Set correctly.

Faulty PCB1'.

Is LED3 (yellow)

ON even if CN2 of

PCB1' is removed?

YesYes

CH Unit

*1): PCB1 Factory Setting for Non-Pole Transmitting

*2): In case that terminal resistance (DSW10-1P) is OFF when H-Link Connection is performed.

Set the terminal resistance to ON when CN2 is removed. Set the terminal resistance to OFF when CN2 is reconnected.

*3): PCB1' Factory Setting for Non-Pole Transmitting

Item Setting Position SW1 Right Side (New Transmission Side)

DSW9-2P ON

DSW10-1P ON

CN101 Transmission Wire Connecting

CN19 Non-Occupied

 Check Item

Item Setting Position Power Supply Faston Terminal SW2 Left Side (New Transmission Side) 380-415V/50Hz

JP1 Short Circuited 380V/60Hz

CN2 Transmission Wire Connecting 220V/60Hz between R1 and S1

CN18 Non-Occupied

between R1 and N

Page 44

1-34

TROUBLESHOOTING

Cause

Check Item

Action

(Turn OFF Main Switch)

Measure voltage by tester.

Supply power.

Phenomenon

Short Circuit between Wires

Melted Fuse for Power Source or Activation of Breaker (Outdoor Unit and CH Unit)

Power Failure or No Power Supply

Check for breakage of insulation.

Remove short circuit and replace fuse.

Short Circuited Wire to Ground

Remove short circuit to ground and replace fuse.

Fault Outdoor Unit Fan Motor

Measure resistance between wires and insulation resistance.

Replace outdoor unit fan motor and fuse.

Faulty Comp. Motor

Measure resistance between wires and insulation resistance.

Replace comp. and fuse.

Failure of AC Chopper for Outdoor Fan

Replace the AC chopper for outdoor fan and fuse.

Measure insulation resistance.

Short Circuit between Wires

Melted Fuse for Control Circuit or Activation of Breaker (Outdoor Unit and CH Unit)

Check for breakage of insulation.

Remove short circuit and replace fuse.

Short Circuit of Control Circuit (to Ground)

Remove short circuit and replace fuse.

Failure of Outdoor Unit Fan Motor

Measure resistance between wires and insulation resistance.

Replace the AC chopper for outdoor fan, fan motor ad fuse.

Faulty Solenoid Coil for Magnetic Switch for Comp. Motor

Measure resistance of coil.

Replace magnetic switch and fuse.

Check continuity and looseness of connection screws.

Replacing Wires, Repairing and Tightening Screws

Check terminal Nos.

Correctly Connect Wires

Failure of AC Chopper for Outdoor Fan

Replace the AC chopper for outdoor fan and fuse.

Measure insulation resistance.

Measure input voltage at CN1 on PCB(2) *1)

Replace transformer.

Check connections. Correctly connect wires.

Replace it if faulty.

Faulty Transformer (CH Unit)

Measure output voltage of PCB1 *2)

Replace PCB1.Incorrect Power Supply Circuit of PCB1

Check for unit number setting of RSW on Indoor PCB

Set unit number correctly by dip switches on Indoor PCB.

Incorrect Setting of Indoor Unit Number

Between Outdoor Unit and Indoor Unit

Disconnected Wires Insufficient Contacting or Incorrect Connection

Check continuity of wires. Check for looseness of connection screws. Check terminal Nos.

Replacing wires, repairing, tightening screws and correct wiring.

Power Source Wiring for Outdoor Unit

Disconnected Wires to PCB

Faulty PCB (Outdoor Unit, Indoor Unit)

Faulty PCB

Disconnected Wire Insufficient Contacting

Incorrect Wiring

*1): Input Voltage at CN1 on PCB(2).

(22.2VAC between #1 and #2, 14.5VAC between #3 and #4)

*2): 12VDC between VCC12 and GND2, 5VDC between VCC05 and GND1,

12VDC between VCC12 and GND1, 15VDC between VCC15 and GND1, 24VDC between VCC24 and GND1, 12VDC between VCC12T and GND1,

Page 45

1-35

TROUBLESHOOTING

Yes

Disconnect CN14 of PCB1.

Check the wiring between PCB1 and PCB3. (5 to 20HP) Check the wiring between PCB1 and ISPM. (24 and 30HP)

Check PCB3 (5 to 20HP) Check ISPM (24 and 30HP)

Check PCB3 and check the wiring between PCB1 and PCB3. (5 to 20HP) Check ISPM and check the wiring between PCB1 and ISPM. (24 and 30HP)

Faulty PCB1.

Is LED2 (green) on

PCB1 flickering?

Yes

Is LED4 (yellow) on

PCB3 OFF?

Is LED4 (yellow) on

PCB3 flickering?

YesYes

Is LED2 (green) on

PCB1 flickering?

Check PCB3 (5 to 20HP) Check ISPM (24 and 30HP)

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section, and the unit

No. and alarm code are indicated on the display of the outdoor unit PCB1.

 This alarm is indicated when abnormality is maintained for 30 seconds after normal transmitting between the

outdoor unit PCB1 and inverter PCB3, and also abnormality is maintained for 30 seconds after the microcomputer is automatically reset. The alarm is indicated when the abnormal transmitting is maintained for 30 seconds from starting of the outdoor unit. (In case of 5 to 20HP)

 This alarm is indicated when abnormality is maintained for 30 seconds after normal transmitting between the

outdoor unit PCB1 and ISPM, and also abnormality is maintained for 30 seconds after the micro-computer is automatically reset. The alarm is indicated when the abnormal transmitting is maintained for 30 seconds from starting of the outdoor unit. (In case of 24 and 30HP)

PCB1: Control PCB in Outdoor Unit PCB3: Inverter PCB (High Voltage) (5 to 20HP) ISPM: Inverter System Power Module (24 and 30HP)

Alarm Code

Abnormal Transmitting between Inverter and Outdoor PCB1, 3

Cause

Check Item

Action

(Turn OFF Main Switch)

Phenomenon

Check continuity. Check for looseness of connection screws.

Replacing Wires, Repairing and Tightening Screws

Check connection Nos.

Correctly Connect Wires

Check connections.

Repair wiring connections.

Replace PCB if faulty.

Between Control PCB and Inverter PCB

Disconnected Wires, Insufficient Contacting or Incorrect Connection

Check continuity of wires. Check for looseness of connection screws. Check connection No.

Replacing wires, repairing, tightening screws and incorrect wiring.

Power Source Wiring for Outdoor Unit

Disconnected Wires to PCB

Faulty PCB (PCB1 for Control, PCB3 for Inverter) (5 to 20HP)

Faulty PCB

Disconnected Wires Insufficient Contacting

Incorrect Wiring

Faulty PCB (PCB for Control, ISPM for Inverter) (24 and 30HP)

Page 46

1-36

TROUBLESHOOTING

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section,

and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.

 This alarm code is indicated when the main power source phase is reversely connected or one

phase is not connected.

Alarm Code

Abnormality of Picking up Phase Signal

Correctly connect each phase of power source.

Single Phase (Is there any phase not connected?)

Yes

PCB1 is normal

Voltage for unit to be suspended.

Running Voltage: "B" V

Power Supply "A" "B"

187

323

342 to 456380-415V, 50Hz 380V, 60Hz 220V, 60Hz

Starting Voltage: Less than "A" V

Abnormality with Power Source.

Is there any excessively voltage decrease at power source?

Yes

Correctly connect each phase of power source.

Faulty PCB1 or other cause. Refer to next page.

Reverse Phase Connection?

Yes

NOTE: PCB1: Outdoor Unit Printed Circuit Board

342 to 418

198 to 242

Cause

Check Item

Action

(Turn OFF Main Switch)

Phenomenon

Activation of Reverse Phase Sensor in Outdoor Unit

Check it according to electrical wiring in Page 1-6, 1-7 and 1-9.

Replacing Wires, Repair, Tightening Screws or Correct Wiring

Reverse or Single Phase

Replace PCB if

faulty.

Faulty Outdoor Unit PCB

Page 47

1-37

TROUBLESHOOTING

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section,

and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.

 This alarm code is indicated when voltage between terminal “P” and “N” of transistor module (IPM) is

insufficient and its occurrence is three times in 30 minutes. In the case that the occurrence is smaller than 2 times, retry is performed.

Alarm Code

Excessively Low or High Voltage for Inverter (For 5 to 20HP)

*1): If capacitor has high voltage, perform the high voltage discharge work refer to item 1.3.6. *2): Checking procedures of diode module is indicated in item 1.3.6. *3): DC voltage measuring position:

IPM “P” Terminal to “+” Terminal of Tester, “N” Terminal to “-” Terminal of Tester Measuring Position: DC 1000V

Does the voltage fall during operation by operation of other apparatus?

Is connection correctly between PCB3 and transistor module?

Does LED2 on PCB3 ON after compressor's electromagnetic switches (CMC) turn on?

Check capacitors (CB1, 2).

Restart operation.

Check wiring and cable capacity.

Connect correctly.

Replace capacitors.

PCB3 is faulty. Replace it.

Capacitors have high voltage. Be careful especially. *1)

Yes

Check the wiring, diode module (DM) and capacitors (CB1, 2). *2)

Normal

Fault

(Loose Wiring, Change of Color)

 Check Item



Frequency can increase higher than 60Hz.

Compressor stops immediately. (lower than 30Hz)

Compressor stops when frequency increase. (Approx. 30Hz to 60Hz

How is compressor operation?

Yes

Is the DC voltage over 460V?

Yes

* Be careful especially because of high voltage.

Yes

* In case of 380-415V/50Hz, 380V/60Hz:

Is the voltage over 323V during operation?

* In case of 220V/60Hz:

Is the voltage over 170V during operation?

Faulty PCB3 for inverter. Replace it.

220V/60Hz

460V

230V

380-415V/50Hz 380V/60Hz

Power Supply Voltage (DC)

* In case of 380-415V/50Hz, 380V/60Hz:

Is the power supply voltage 380V 10% or 415V 10%?

* In case of 220V/60Hz:

Is the power supply voltage 220V 10%?

Page 48

1-38

TROUBLESHOOTING

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section,

and the alarm code is indicated on the display of the outdoor unit PCB.

 This alarm code is indicated when voltage between terminal “P” and “N” of inverter module (ISPM) is

insufficient and its occurrence is three times in 30 minutes. In the case that the occurrence is smaller than 2 times, retry is performed.

Alarm Code

Excessively Low or High Voltage for Inverter (For 24 and 30HP)

TB3

Direct Current Measuring Position

Measuring Range: DC1000V

RS WRBVTU

NPD P

TB2

R216

R215

ZN20

LED201

ZN202

R201

R200

CN207 CN206

CN9

PC207

PC208

CN8

*1): If capacitor has high voltage, perform the high voltage

discharge work refer to item 1.3.6.

*2): Checking procedures of ISPM is indicated in item 1.3.6.

Does the voltage fall during operation by operation of other apparatus?

Is connection correctly between ISPM and capacitors (CB1 and CB2), DCL or CMC?

Check capacitors (CB1, 2).

Restart operation.

Check wiring and cable capacity.

Connect correctly.

Replace capacitors.

Faulty ISPM. Replace it.

Capacitors have high voltage. Be careful especially. *1)

Yes

Check the wiring, ISPM and CB. *2) In case the wiring is correct, replace ISPM.

Normal

Fault

(Loose Wiring, Change of Color)

 Check Item



Frequency can increase higher than 60Hz.

Compressor stops immediately. (lower than 20Hz)

Compressor stops when frequency increase. (Approx. 20Hz to 60Hz)

How is compressor operation?

Yes

Is the DC voltage over 460V?

Yes

* Be careful especially because of high voltage.

Yes

* In case of 380-415V/50Hz, 380V/60Hz:

Is the voltage over 323V during operation?

* In case of 220V/60Hz:

Is the voltage over 170V during operation?

Faulty ISPM. Replace it.

220V/60Hz

460V

230V

380-415V/50Hz 380V/60Hz

Power Supply Voltage (DC)

* In case of 380-415V/50Hz, 380V/60Hz:

Is the power supply voltage 380V 10% or 415V 10%?

* In case of 220V/60Hz:

Is the power supply voltage 220V 10%?

Does LED201 on ISPM ON?

Page 49

1-39

TROUBLESHOOTING

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section,

and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.

 In the case that the discharge gas superheat less than 15 deg. at the top of the compressor is

maintained for 30 minutes, retry operation is performed. However, when the alarm occurs again within 90 minutes, this alarm code is indicated.

Alarm Code

Decrease of Discharge Gas Superheat

Is the thermistor on top of compressor good? *1)

Is superheat value

under 15 degrees

Yes

Check the high-pressure and compressor discharge gas temperature and calculate superheat value by outdoor unit PCB.

Eliminate rapid change of heat load in a room or short path of discharged air among outdoor units.

Remove sudden changes of load like short path of outgoing air to the air intake of the outdoor unit, or the cause of frequent thermo-ON/OFF.

Faulty Thermistor

Is the thermistor installed correctly on the compressor?

Yes

Install it correctly.

Is it at cooling or

heating mode when the

alarm has occurred?

Is the opening

degree of ex. valve

of outdoor bypass

below 5%?

Is the connector

(CN12) for ex. valve

of outdoor bypass

connected properly?

Is the connector on indoor unit PCB for

ex. valve connected

properly?

Are the refrigerant piping and electric

wiring matching?

Is refrigerant

correctly charged?

Is gas leaking?

Yes

Superheat: under

15 degrees

Cooling

Check the discharge pressure and compressor discharge gas temperature and calculate superheat value by outdoor unit PCB.

Heating Operation

Cooling Operation

Heating

Plug the connectors (*2) of PCB1 properly.

Charge correct refrigerant volume. Refer to TCII.

Check the ex. valve.

Plug the connector CN12 of PCB1 properly.

Match the refrigerant piping and electric wiring.

Plug the connector properly.

Repair leaks of gas. Correctly charge refrigerant.

Is the opening of the

outdoor unit heat

exchanger's expansion

valve under 12%?

Are the connectors

(*2) of PCB1 of the

outdoor unit heat

exchanger's electric

expansion valve

connected properly?

Yes

5 to 20HP 24 and 30HP

CN10 and CN11 CN10, CN11, CN12

and CN20

*2): PCB1 Connector No. is shown in the right table.

*1): Refer to "Characteristics of Thermistor" of page 1-53.

Position of Thermistor

THM8(Td1)

for Inverter Drive

RAS-5FSG, RAS-5FS3

THM8(Td1)

for Inverter Drive

RAS-8FSG, RAS-8FS3 RAS-10FSG, RAS-10FS3 RAS-8FXG, RAS-8FX3 RAS-10FXG, RAS-10FX3

THM9(Td2)

for Constant Speed Drive

THM8(Td1)

for Inverter Drive

RAS-16FSG, RAS-16FS3

THM9(Td2)

RAS-20FSG, RAS-20FS3 RAS-24FSG1, RAS-24FS5, RAS-30FSG1, RAS-30FS5

THM12(Td3)

THM13(Td4) 20,24,30HP only

for Constant Speed Drive

Page 50

1-40

TROUBLESHOOTING

Cause

Check Item

Action

(Turn OFF Main Switch)

Phenomenon

Decrease of Discharge Gas Superheat

Check mounting state. (Refer to page 1-39.)

Measure resistance.

Faulty Discharge Gas Thermistor

Fault

Replace thermistor if faulty.

Correctly mount thermistor.

Incorrect Mounting

Check connections.

Remove looseness, replace connector or repair connections.

Incorrect Connection

Check connections.

Replace PCB and check operation.

Faulty PCB

Fault

Replace PCB if faulty.

Repair wiring connections.

Disconnected Wires for Ex. Valve Control

Check ref. cycle and the electrical system.

Repair wiring.

Ref. Cycle is Different from the Electrical System

Measure pressure. (Refer to Figure in Test Run of TCII.)

Correctly charge refrigerant.

Overcharged Refrigerant

Check ex. valve (Refer to 1.3.6).

Replace ex. valve if faulty.

Faulty Ex. Valve

Page 51

1-41

TROUBLESHOOTING

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section,

and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.

 This alarm is indicated when the following conditions occurs three times within one hour;

(1) The temperature of the thermistor on the top of the compressor is maintained higher than 132°C for 10 minutes, or (2) The temperature of the thermistor on the top of the compressor is maintained higher than 140°C for 5 seconds.

Alarm Code

Excessively High Discharge Gas Temperature

at the Top of Compressor Chamber

Is the thermistor on top of compressor good?

Yes

Check the outdoor unit PCB if the compressor discharge gas temperature is over 132

Remove sudden changes of load like short path of discharge air to the intake of the outdoor unit, or the cause of frequent thermo-ON/OFF.

Remove sudden changes of load like short path of discharge air to the air intake of the outdoor unit, or the cause of frequent thermo-ON/OFF.

Faulty Thermistor

See page 1-53 for the thermistor resistance.

Is the thermistor installed correctly on the compressor?

Yes

Install it correctly.

Is it at cooling or

heating mode when the

alarm has occurred?

Is the opening degree of ex. valve of outdoor

bypass 100%?

Is the connector

(CN12) for ex. valve

of outdoor bypass

connected properly?

Is the opening of all

the operating indoor

units ex. valve 100%?

Is the amount of

refrigerant correct?

Is gas leaking?

Yes

Cooling

Check the outdoor unit PCB to see if the compressor discharge gas temperature is over 132

Heating Operation

Cooling Operation

Heating

Plug the connectors (*1) of PCB1 properly.

Charge correct refrigerant volume. Refer to TCII.

Check the ex. valve.

Plug the connector CN12 of PCB1 properly.

Remove sudden changes of indoor load (short path, etc.) or short path of air between outdoor units.

Repair leaks of gas. Recharge refrigerant.

Is the opening of the

outdoor unit ex. valve

100%?

Are the connectors

(*1) of PCB1 of the

outdoor unit heat

exchanger's ex. valve

connected properly?

Yes

Position of Thermistor

THM8 (Td1)

for Inverter Drive

RAS-5FSG, RAS-5FS3

THM8 (Td1)

for Inverter Drive

RAS-8FSG, RAS-8FS3 RAS-10FSG, RAS-10FS3 RAS-8FXG, RAS-8FX3 RAS-10FXG, RAS-10FX3

THM9 (Td2)

for Constant Speed Drive

THM8 (Td1)

for Inverter Drive

RAS-16FSG, RAS-16FS3

THM9 (Td2)

RAS-20FSG, RAS-20FS3 RAS-24FSG1, RAS-24FS5, RAS-30FSG1, RAS-30FS5

THM12 (Td3)

THM13 (Td4) 20, 24, 30HP only

for Constant Speed Drive

5 to 20HP

24 and 30HP

CN10 and CN11 CN10, CN11,

CN12 and CN20

*1): PCB1 Connector No. is shown in the below table.

Page 52

1-42

TROUBLESHOOTING

Cause

Check Item

Action

(Turn OFF Main Switch)

Phenomenon

Excessively High Discharge Gas Temperature (at Top of Compressor)

Check mounting state.

Check resistance of thermistor.

Faulty Discharge Gas Thermistor

Fault

Replace thermistor if faulty.

Correctly mount thermistor.

Incorrect Mounting of Thermistor

Check connections.

Remove looseness, replace connectors or repair connections.

Incorrect Wiring

Check connections.

Replace PCB and check operation.

Faulty PCB

Fault

Replace PCB if faulty.

Repair wiring connections.

Disconnected Wires for Ex. Valve

Check ref. cycle and the electrical system.

Repair wiring.

Ref. Cycle is Different from the Electrical System

Ref. Leakage

Replace solenoid

valve if faulty.

Faulty Gas Bypass Solenoid Valve

Check pressures.

Correctly charge refrigerant.

Shortage of Refrigerant

Check ex. valve (Refer to 1.3.6).

Replace ex. valve if faulty.

Faulty Ex. Valve

Page 53

1-43

TROUBLESHOOTING

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section,

and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.

 This alarm code is indicated when the temperature of the internal thermostat () for the outdoor fan

motor is higher than 130°C.

Alarm Code

Activation of Protection Device for Outdoor Fan Motor

Yes

Replace the motor.

Correct connection. Replace the connector.

If the voltage is over 264V or under 187V, check the power source and check the wiring around the outdoor unit PCB.

No No

Yes

Does the outdoor fan run?

Is continuity present after temperature has dropped to under 83

C at the internal thermostat of the outdoor fan motor?

Replace the outdoor fan motor if faulty. Or check outdoor temperature. If it is unusual, take suitable action to reduce it.

<Common> Is 220V or 240V applied across R2 and S2 on PCB2 (AC Chopper)? Is 220V or 240V applied across R2 and N of TB1?

Is connection bad at the connector PCN14 on PCB1 or fan motor connectors (CN1, CN2, CN50, CN51, CN52)?

 Check Item

5 to 20HP ITO1, 2 380-415/380V, 220V 50/60Hz 24, 30HP ITO1, 2, 3 380-415V 50Hz, 380V 60Hz

ITO1, 3 220V 60Hz

HP Mark Power Supply

Cause

Check Item

Action

(Turn OFF Main Switch)

Phenomenon

Activation of Internal Thermostat for Outdoor Unit Fan Motor

Measure resistance by tester.

Check continuity after fan motor temperature decreases to room temp.

Faulty Internal Thermostat

Fault

Replace fan motor if no continuity of internal thermostat under 83

Correct looseness. Replace connectors.

Insufficient Contacting

Check connections. Repair connections.

Incorrect Connection

Measure coil resistance and insulation resistance.

Replace motor if faulty.

Faulty Outdoor Unit Fan Motor

Page 54

1-44

TROUBLESHOOTING

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section,

and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.

 This alarm code is indicated when the thermistor is short-circuited (less than 0.24 kΩ) or cut (greater

than 840 kΩ) during the cooling or heating operation. The system is automatically restarted when the fault is removed.

Alarm Code

Abnormality of Thermistor for Indoor Unit Inlet Air Temperature

(Air Inlet Thermistor)

NOTE: This data is applicable to the following thermistors;

1. Indoor Unit Discharge Air Temperature, 2. Indoor Unit Liquid Refrigerant Temperature, 3 Indoor Unit Intake Air Temperature, 4. Outdoor Air Temperature, 5. Outdoor Unit Evaporating Temperature, 6. Indoor Unit Gas Piping

Indoor Unit Air Inlet Thermistor

In Case of 4-Way Cassette Type

-15 -10 -5 0 5 10 15 20 25 30 35 40 45 50 55 60

20.5

12.5 10

5.3

3.6

2.5

Ambient Temperature (

Thermistor Resistance

(KΩ)

Thermistor Characteristics

Yes

Connect it.

Faulty Thermistor

Faulty PCB

Is it connected to THM1 (intake) of PCB?

Is resistance of THM1 between 0.24kΩ and 840kΩ?

Cause

Check Item

Action

(Turn OFF Main Switch)

Phenomenon

Faulty Intake Air Thermistor

Check resistance.

Replace thermistor if faulty.

Fault

Check connection.

Repair wiring and connections.

Incorrect Connection

Replace PCB and check operation.

Replace PCB if faulty.Faulty PCB

Page 55

1-45

TROUBLESHOOTING

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section,

and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.

 This alarm code is indicated when the thermistor is short-circuited (less than 0.24 kΩ) or cut (greater

than 840 kΩ) during the cooling or heating operation.

Alarm Code

Abnormality of Thermistor for Indoor Unit Discharge Air Temperature

(Air Outlet Thermistor)

Yes

Connect it.

Refer to page 1-44 for thermistor resistance.

Faulty PCB

Is the thermistor connected to THM2 of PCB?

Yes

Faulty Thermistor

Is resistance of THM2 between 0.24 and 840kΩ?

Cause

Check Item

Action

(Turn OFF Main Switch)

Phenomenon

Faulty Air Outlet Thermistor

Check resistance.

Replace thermistor if faulty.

Fault

Check wiring to PCB.

Repair wiring and connections.

Incorrect Connection

Replace PCB and check operation.

Replace PCB if faulty.Faulty PCB

Indoor Unit Air Outlet Thermistor

In Case of 4-Way Cassette Type

Page 56

1-46

TROUBLESHOOTING

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section,

and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.

 This alarm code is indicated when the thermistor is short-circuited (less than 0.24 kΩ) or cut (greater

than 840 kΩ) during the cooling operation or heating operation.

Alarm Code

Abnormality of Thermistor for Indoor Unit Heat Exchanger Liquid

Refrigerant Pipe Temperature (Freeze Protection Thermistor)

Yes

Connect it.

Refer to page 1-44 for thermistor resistance.

Faulty PCB

Is the thermistor connected to THM3 of PCB?

Yes

Faulty Thermistor

Is resistance of THM3 between 0.24 and 840kΩ?

Cause

Check Item

Action

(Turn OFF Main Switch)

Phenomenon

Faulty Freeze Protection Thermistor

Check resistance.

Replace thermistor if faulty.

Fault

Check wiring to PCB.

Repair wiring and connections.

Incorrect Connection

Replace PCB and check operation.

Replace PCB if faulty.Faulty PCB

Freeze Protection Thermistor (THM3)

In Case of 4-Way Cassette Type

Page 57

1-47

TROUBLESHOOTING

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section,

and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.

 This alarm code is indicated when the thermistor is short-circuited (less than 0.24 kΩ) or cut (greater

than 840 kΩ) during the cooling or heating operation. The system is automatically restarted when the fault is removed.

Alarm Code

Abnormality of Thermistor for Indoor Unit Heat Exchanger

Gas Refrigerant Pipe Temperature (Gas Piping Thermistor)

Refer to page 1-44 for thermistor resistance.

Yes

Connect it.

Faulty Thermistor

Faulty PCB

Is it connected to THM5 of PCB?

Is resistance of THM5 between 0.24kΩ and 840kΩ?

Cause

Check Item

Action

(Turn OFF Main Switch)

Phenomenon

Faulty Thermistor for Indoor Unit Heat Exchanger Gas Pipe Temp.

Check resistance.

Replace thermistor if faulty.

Fault

Check wiring to PCB.

Repair wiring and connections.

Incorrect Connection

Replace PCB and check operation.

Replace PCB if faulty.Faulty PCB

Thermistor for Heat Exchanger Gas Pipe

In Case of 4-Way Cassette Type

Page 58

1-48

TROUBLESHOOTING

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section,

and the alarm code is indicated on the display of the outdoor unit PCB.

 This alarm code is indicated when the following conditions occurs three times in 30 minutes.

* Indoor fan rotates less than 70rpm for 5 seconds during operation.

Alarm Code

Activation of Protection Device for Indoor Fan Motor

(RCI-Model)

Faulty PCB2

Insufficient voltage for PCB2. (DC 280V)

Does the indoor fan run?

Is LED1 on

PCB2 OFF?

Check the connector as shown on the right.

PCB1: CN1, CN19, PCN1, PCN7 PCB2: CN201, CN202, PCN201, PCN202, PCN203

Yes

Replace PCB2

Faulty PCB1

Replace PCB1

Is fan motor

speed control command

to fan motor

correctly?

Faulty PCB1 or Transformer

Insufficient voltage for PCB1.

Faulty PCB1 or Transformer

Faulty Fan Motor

Is LED4 on PCB2

OFF?

Replace PCB1 or Transformer

Replace Fan Motor

Yes

Faulty PCB2

Is the voltage between GND of PCB1 and PC1 2# of PCB2 several voltage?

Remove CN201 on PCB2. Is the voltage between CN201 #3 and GND1 more than 1V?

Is pulse signal to

PCB2 correctly?

Replace PCB2

Faulty PCB2

Is DC power

supply for PCB2

correctly?

Is DC power

supply for PCB1

correctly?

Replace PCB2

Yes

Is the voltage between Vcc15 and GND1 of PCB2 15V+10%?

Is the voltage between Vcc05 and GND of PCB1 5V+5%?

Is the voltage between Vcc12 and GND of PCB1 12V+10%?

Yes

PCB1

PCB2

Electrical Box

LED

CN201 CN203

PCN203

Tr ansformer

PCN7 PCN11

LED4

CN1

CN19

TB1

TB2

PC1

PC1-2#

CN201 CN202

CN201-3#

PCN202

Page 59

1-49

TROUBLESHOOTING

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section,

and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.

 This alarm code is indicated when the temperature of the internal thermostat for the indoor fan motor

is higher than 130°C.

Alarm Code

Activation of Protection Device for Indoor Fan Motor

(except RCI and RPK Model)

Yes

Replace the motor.

No No No

Repair wiring and connections.

Replace the motor.

Yes

Does the indoor fan run?

Is fan motor hot?

Is continuity present

at the internal thermostat

of indoor fan motor?

Is connection bad at

the connector?

Is the coil resistance

of fan motor normal?

Check indoor temperature. If it is unusual, take suitable action to reduce it.

Cause

Check Item

Action

(Turn OFF Main Switch)

Phenomenon

Activation of Internal Thermostat for Indoor Unit Fan Motor

Measure resistance by tester.

Check continuity after fan motor temperature decreases to room temp.

Faulty Internal Thermostat

Fault

Replace fan motor if no continuity.

Correct looseness. Replace connectors.

Insufficient Contacting

Check connections. Repair connections.

Incorrect Connection

Measure coil resistance and insulation resistance.

Replace motor if faulty.

Faulty Indoor Unit Fan Motor

Page 60

1-50

TROUBLESHOOTING

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section,

and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.

 This alarm code is indicated when the running current of the indoor fan motor is higher than 1A.

Alarm Code

Activation of Protection Device for Indoor Fan Motor

(RPK-Model)

Yes

Replace the PCB.

No No

Replace the motor.

Repair wiring and connections.

Replace the motor.

Yes

Does the indoor fan run?

Is the fuse (EF1, EF2) cut out?

In the case of Hi-Tap setting, is the voltage

between #5-#31 of

CN29 on PCB normal?

Is connection bad at

the connector?

Is the coil resistance

of fan motor normal?

Check the dislocation of motor shaft and the obstacle of current of air.

Cause

Check Item

Action

(Turn OFF Main Switch)

Phenomenon

Activation of Overcurrent Protection Device for Indoor Fan Motor

Measure resistance by tester.

Check the output voltage and fuse in the case of Hi-Tap Setting.

Faulty PCB

Fault

Replace PCB.

Correct looseness. Replace connectors.

Insufficient Contacting

Check connections. Repair connections.

Incorrect Connection

Measure coil resistance and insulation resistance.

Replace motor if faulty.

Faulty Indoor Unit Fan Motor

Page 61

1-51

TROUBLESHOOTING

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section,

and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.

 This alarm code is indicated when the pressure sensor voltage decreases lower than 0.1V or

increases higher than 4.9V during running.

Alarm Code

Abnormality of High Pressure Sensor for Outdoor Unit

Is the connection CN7 of the outdoor unit PCB1 bad?

Is 12 VDC applied across #1 and #3 of the connector CN7 of the outdoor unit PCB1?

Yes

Is voltage under

0.1 VDC or over 4.9VDC across #2 and #3 of the

connector CN7 of the

outdoor unit PCB1?

Clogged Check Joint?

Abnormality of High Pressure Sensor.

Connect correctly.

PCB1 defective.

Yes

Faulty PCB1.

Replace check joint.

Yes

Cause

Check Item

Action

(Turn OFF Main Switch)

Phenomenon

Faulty High Pressure Sensor

Check output voltage is correct.

Replace pressure sensor if faulty.

Fault

Indicated Pressure Value is Excessively High or Low

Check for clogging of check joint.

Replace check joint.

Malfunction of Pressure Sensor due to Faulty Check Joint

Check connections.

Repair wiring and connections.

Incorrect Connection

Replace PCB and check operation.

Replace PCB if faulty.Faulty PCB

Page 62

1-52

TROUBLESHOOTING

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section,

and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.

 This alarm code is indicated when the thermistor is short-circuited (less than 0.2 kΩ) or cut (greater

than 500 kΩ) during running. However, this alarm occurs during test running mode only. In the case that the thermistor is abnormal during running, operation continues based on the assumption that the outdoor temperature, is 35°C (Cooling) / 6°C (Heating).

Refer to page 1-44 for thermistor resistance.

Alarm Code

Abnormality of Thermistor for Outdoor Air Temperature

(Outdoor Unit Ambient Thermistor)

Yes

Connect it.

Faulty Thermistor

Refer to page 1-44.

Faulty PCB1

Is it connected to THM7 (TA) of PCB1?

Is resistance of THM7 between 0.2kΩ and 500kΩ?

Cause

Check Item

Action

(Turn OFF Main Switch)

Phenomenon

Faulty Thermistor for Outdoor Unit Ambient

Check resistance.

Replace thermistor if faulty.

Fault

Check wiring to PCB.

Repair wiring and connections.

Incorrect Connection

Replace PCB and check operation.

Replace PCB if faulty.Faulty PCB

Outdoor Unit Ambient Thermistor (THM7)

Page 63

1-53

TROUBLESHOOTING

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section, or

the unit No. and alarm code are indicated on the display of the outdoor unit PCB. (*1) If abnormality with the thermistor is found, check all the thermistors as shown below.

 This alarm code is indicated when the thermistor is short-circuited (less than 0.9 kΩ) or cut (greater

than 2,350 kΩ) during running.

Alarm Code

Abnormality of Thermistor for Discharge Gas

Temperature on the Top of Compressor Chamber

Cause

Check Item

Action

(Turn OFF Main Switch)

Phenomenon

Faulty Discharge Gas Thermistor

Check resistance.

Replace thermistor if faulty.

Fault

Check wiring to PCB.

Repair wiring and connections.

Incorrect Connection

Replace PCB and check operation.

Replace PCB if faulty.Faulty PCB

Check setting of DSW2 on PCB1.

Correctly set DSW2 on PCB1.

Incorrect Setting of DSW2 on PCB1

Yes

Set DSW2 on PCB1 correctly.

Connect them.

Faulty Thermistor.

Position of Thermistor

(*1) Indication on the display

of the outdoor unit PCB.

Faulty PCB1

Is the setting of DSW2 on PCB1 right?

Are thermistors, THM8, THM9, THM12 and THM13 connected to THM8(TD1), THM9(TD2), THM12(TD3) and THM13(TD4)?

Yes

Is resistance of THM8, THM9, THM12 and THM13 same with characteristic in right figure?

123Faulty TD1 223Faulty TD2 323Faulty TD3 423Faulty TD4

THM8 (TD1)

for Inverter Drive

RAS-5FSG, RAS-5FS3

THM8 (TD1)

for Inverter Drive

RAS-8FSG, RAS-8FS3 RAS-10FSG, RAS-10FS3 RAS-8FXG, RAS-8FX3 RAS-10FXG, RAS-10FX3

THM9 (TD2)

for Constant Speed Drive

THM8 (TD1)

for Inverter Drive

RAS-16FSG, RAS-16FS3

THM9 (TD2)

RAS-20FSG, RAS-20FS3 RAS-24FSG1, RAS-24FS5, RAS-30FSG1, RAS-30FS5

THM12 (TD3)

THM13 (TD4) 20, 24, 30HP only

for Constant Speed Drive

200

100

R25=200kΩ B=3920k

72.3

14.2

8.32

02550 100 120 150

Ambient Temperature (

Resistance of Thermistor (kΩ)

Characteristics of Thermistor

Page 64

1-54

TROUBLESHOOTING

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section,

and or the unit No. and alarm code are indicated on the display of the outdoor unit PCB. (*1) If abnormality with the thermistor is found, check all the thermistors as shown below.

 The evaporating thermistor during the heating operation is attached to the heat exchanger as shown

below figure. If this thermistor is faulty, this alarm is indicated. The position is indicated below.

Alarm Code

Abnormality of Thermistor for Evaporating Temperature

during Heating Operation (Outdoor Unit)

Yes

Connect it.

Faulty Thermistor

Regarding the thermistor characteristics, refer to page 1-44.

Faulty PCB1

Is CN105 or CN106 on PCB1 connected to THM10 (Te1), or THM11 (Te2) or THM15 (Te3)?

Is resistance of the thermistor between

0.2kΩ and 500kΩ?

(*1) Indication on the display

of the outdoor unit PCB.

124Faulty Te1 224Faulty Te2 324Faulty Te3

Cause

Check Item

Action

(Turn OFF Main Switch)

Phenomenon

Faulty Thermistor for Evaporating Temperature during Heating

Check resistance.

Replace thermistor if faulty.

Fault

Check wiring to PCB.

Repair wiring and connections.

Incorrect Connection

Replace PCB and check operation.

Replace PCB if faulty.Faulty PCB

RAS-5FSG, 5FS3 RAS-8FSG, 8FS3 RAS-10FSG, 10FS3

RAS-8FXG, 8FX3 RAS-10FXG, 10FX3

RAS-16FSG, 16FS3 RAS-20FSG, 20FS3

THM10

THM11

THM10

RAS-24FSG1, 24FS5 30FSG1, 30FS5

THM10

THM11

THM5

THM10

Page 65

1-55

TROUBLESHOOTING

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section,

and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.

 This alarm code is indicated when the pressure sensor voltage decreases lower than 0.1V or

increases higher than 4.9V during running.

Alarm Code

Abnormality of Low Pressure Sensor

(Outdoor Unit)

Cause

Check Item

Action

(Turn OFF Main Switch)

Phenomenon

Faulty Low Pressure Sensor

Check output voltage is correct.

Replace pressure sensor if faulty.

Fault

Indicated Pressure Value is Excessively High or Low

Check for clogging of check joint.

Replace check joint.

Malfunction of Pressure Sensor due to Faulty Check Joint

Check connections.

Repair wiring and connections.

Incorrect Connection

Replace PCB and check operation.

Replace PCB if faulty.Faulty PCB

Is the connection CN8 of the outdoor unit PCB1 mated loose?

Is 5 VDC applied across #1 and #3 of the connector CN8 of the outdoor circuit board PCB1?

Is voltage under 0.1 VDC or over 4.9 VDC across #2 and #3 of the connector CN8 of the outdoor circuit board PCB1?

Yes

Is the Check Joint clogged?

Abnormality with Low Pressure Sensor.

Connect correctly.

Faulty PCB1

Yes

Faulty PCB1

Replace the check joint.

Yes

Page 66

1-56

TROUBLESHOOTING

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section,

and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.

 This alarm code is indicated when there are more than two (2) CH units connected between outdoor

unit and indoor unit due to incorrect wiring connection.

 This alarm code is indicated when the outdoor unit PCB (PCB1) for FSG/FS3 series is attached

incorrectly to the FXG/FX3 series outdoor unit.

Alarm Code

Incorrect Wiring Connection (FX Series Only)

Is wiring connection correct?

Yes

Is PCB1 for FXG/FX3 series?

Yes

Fault PCB for CH Unit

Correct the wiring connection and start the unit again.

Outdoor Unit PCB is correct.

Outdoor Unit PCB is for FSG/FS3 series.

Replace the PCB1 with the one for FXG/FX3 series and start the unit again.

Correct Wiring

No. 1, 2 of TB2

No. 3, 4 of TB2

CH Unit

Indoor Unit

Outdoor Unit

Indoor Unit

CH Unit

No. 1, 2 of TB2

No. 3, 4 of TB2

Incorrect Wiring

No. 1, 2 of TB2

No. 3, 4 of TB2

Indoor Unit

Outdoor Unit

Indoor Unit

No. 1, 2 of TB2

No. 3, 4 of TB2

Incorrect Example; Two (2) CH units between outdoor unit and indoor unit

CH Unit

Page 67

1-57

TROUBLESHOOTING

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section,

and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.

 This alarm code is indicated when the capacity setting dip switch, DSW2 on the outdoor unit PCB1,

is not set (all the settings from #1 to #3 are OFF) or mis setting.

 This alarm code is indicated when the total indoor unit capacity is smaller than 50% or greater than

150% of the combined outdoor unit capacity.

Alarm Code

Incorrect Capacity Setting or Combined Capacity

between Indoor Units and Outdoor Unit

Are #1-#3 of DSW2 on the outdoor unit PCB1 set correctly?

Are the setting of DSW1 on the outdoor unit PCB1 and the setting of DSW5 on the indoor unit PCB totally same in a refrigerant cycle?

Total capacity of the indoor units is wrong.

Set the capacity for PCB1.

Yes

Are #1-#4 of DSW3 on the indoor unit PCB set correctly?

Set the capacity for PCB.

Set them correctly.

Cause

Check Item

Action

(Turn OFF Main Switch)

Phenomenon

Check combination of indoor units and capacity setting on PCB.

Correctly set dip switch, DSW3.

Incorrect Capacity Setting of Indoor Unit

Check outdoor unit model by calculating total indoor units capacity.

Ensure that total indoor unit capacity is from50% to 130%.

Total Indoor Unit Capacity Connected to the Outdoor Unit is Beyond Permissible Range

Check refrigeration cycle setting on outdoor unit PCB and indoor unit PCB.

Set them correctly.

Refrigeration Cycle Setting of Outdoor Unit and Indoor Unit is Different

Check capacity setting on outdoor unit PCB.

Correctly set dip switch, DSW2.

Incorrect Capacity Setting of Outdoor Unit

 In case of 16 or less of total indoor unit, set the dip switch DSW1

of outdoor unit PCB1 and DSW5 of indoor unit PCB correctly.

 In case of 17 or more of total indoor unit, set DSW5 of indoor unit

PCB at {(DSW1 of outdoor unit PCB1)+1}.

Combination

Total Q'ty

Total Capacity

(HP)

RAS-5FSG(3) 2-8 sets *1) 2.5-6.5

*1): RAS-8FSG(3), RAS-8FXG(3) 4.0-10.4 RAS-10FSG(3), RAS-10FXG(3) 5.0-13.0

RAS-16FSG, RAS-16FS3 2-13 (16) sets *2) 8.0-20.8 *2): RAS-20FSG, RAS-20FS3 2-16 sets 10.0-26.0 RAS-24FSG1, RAS-24FS5 2-27 sets 12.0-31.2 RAS-30FSG1, RAS-30FS5 2-30 sets 15.0-39.0

In case of changing the indoor unit capacity from 1.0HP or 1.5HP to 1.3HP by dip switch setting.

Outdoor Unit Model

Combined Indoor Unit

Notes

2-12 sets

If the capacity of one indoor unit is the same as of the outdoor unit, the system can be operated.

Page 68

1-58

TROUBLESHOOTING

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section,

and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.

 This alarm code is indicated on the remote control switch of other indoor unit when no transmitting

data is issued from a malfunctioning indoor unit for more than 60 minutes after receiving transmitting data from the indoor unit.

Alarm Code

Abnormality in Transmitting of Other Indoor Units

Yes

Plug the connector CN2 properly and restart operation.

No No

Yes

Is there any indoor unit with indication of alarm code "03"?

Yes

Is the connector CN2 on PCB of indoor unit loose?

Yes

Is LED3 (yellow) flickering on the PCB of indoor unit?

Check connections of the PCB of indoor unit, CH unit or connector CN1.

Check the wires between the indoor unit, CH unit and outdoor unit.

Yes

Is LED3 OFF?

Is still LED3 ON?

Is there any indoor unit whose lamp is not lit or whose LCD is not indicated at the remote control switch?

Check the power source, fuse and transformer of the indoor unit or CH unit.

Yes

Faulty indoor unit PCB.

Cause

Check Item

Action

(Turn OFF Main Switch)

Phenomenon

If all indoor unit show alarm code 32, check PCB by self-checking mode for all indoor unit or CH unit.

Replace PCB if faulty.

Faulty Indoor Unit PCB or CH Unit PCB

Abnormal Transmitting from Other Units

Check indoor unit showing alarm code "03".

Take action according to pages 1-28 to 34.

Abnormal Transmitting

Indoor Unit Outdoor Unit Outdoor Unit Indoor Unit

Check indoor unit showing no light ON on remote control switch.

Incorrect Power Supply (to Indoor Unit or CH Unit) *1)

Take action according to pages 1-13 to 14.

*1): This abnormality is indicated on an indoor unit which is normal, since this is due to abnormality of transmitting of

the indoor units or power source abnormality in the same refrigeration cycle and electrical system. If the power source is abnormal, abnormality can not be indicated by its indoor unit, so, this alarm is indicated on the remote control switch of other indoor unit.

Page 69

1-59

TROUBLESHOOTING

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section,

and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.

 This alarm code is indicated 3 minutes after power is supplied to the outdoor unit when the indoor

unit No. connected to the outdoor unit is duplicated by setting of RSW.

In the case of H-Link System, this alarm code is indicated when DSW1 of the outdoor unit PCB and DSW5 of the indoor unit PCB are incorrectly set. In this case, set correctly DSW1 and DSW5 after turning off Main Switch.

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section,

and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.

 This alarm code is indicated when AC 220V or 240V is supplied to voltage *A or *B on PCB1 in the

outdoor unit during inverter compressor stoppage.

Alarm Code

Abnormality of Picking up Circuit for Protection

(Outdoor Unit)

Alarm Code

Incorrect Indoor Unit No. Setting

Faulty PCB1

Check wiring connection of other PCB. *1)

No No

Yes

Yes PCB1 is normal

Is 220VAC or 240VAC applied *A during stopping?

Is 220VAC or 240VAC applied *B during stoppage?

Cause

Check Item

Action

(Turn OFF Main Switch)

Phenomenon

Abnormality of Picking up Circuit for Protection

Check voltage supplied to connectors.

Repair wiring connections.

Incorrect Connection

Faulty PCB Replace PCB.

*1): Check wiring system connecting to PCN14 and PCN2 on PCB1.

Power Supply *A *B

380-415V/50Hz Between terminal #3 of PCN14 on PCB1 Between terminal #3 of PCN2 on PCB1

380V/60Hz and faston terminal "N" on PCB1 and faston terminal "N" on PCB1 220V/60Hz Between terminal #3 of PCN14 on PCB1 Between terminal #3 of PCN2 on PCB1

and faston terminal "S" on PCB1 and faston terminal "S" on PCB1

Page 70

1-60

TROUBLESHOOTING

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section,

and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.

 This alarm code is indicated when the following conditions occurs;

• The running current of the constant compressor exceeds the value of overcurrent limitation during operating.

• The running current of the constant compressor is detected 0A and retry when 3 minutes are passed after all compressors are stopped, and this phenomenon occurs three times within 30 minutes.

Alarm Code

Abnormality of Running Current at Constant Compressor

Connect it correctly.

No No

Yes

Does the CMC2~4 turn ON?

Does the constant compressor operate?

Is the running current indicated on 7-Segment of PCB1 at check mode?

Is the connector CN4~6 of current transformer correctly connected?

Check wiring connection around PCB1.

Check fuses and wiring between CMC2~4 and constant compressor.

Check constant compressor and current transformer. Remove the cause after checking.

Indication of 7-Segment

Abnormality of Constant Compressor

MC2

MC3

MC4

Page 71

1-61

TROUBLESHOOTING

Cause

Check Item

Action

(Turn OFF Main Switch)

Phenomenon

Check continuity during stoppage.

Faulty CT

Replace CT when faulty.Fault

Measure resistance by tester.

Remove looseness and replace connector.

Incorrect Connection

Check wiring. Correctly wiring.

Incorrect Wiring

Imbalance Among Phase at Power Source

Excessively High or Low Voltage of Power Source

Excessively Large Running Current of Compressor Motor

Adjust voltage between each phase.

Excessively High Discharge Pressure

Operate within 380-415V 10% (50Hz) 380V 10% (60Hz) 220V 10% (60Hz)

−

Check for causes.

Overcurrent of Compressor Motor

Locked-up? Replace compressor.

Seizure of Compressor Bearing

Looseness of Screws for Power Source

Single Phase Operation

Tightly fix screws.

Deterioration of Contact of Magnetic Switch for Compressor

Replace magnetic contactor.

Measure insulation resistance.

Replace compressor.

Insulation Failure of Compressor Motor

Melted Fuse for Power Source

Replace the fuses.

Page 72

1-62

TROUBLESHOOTING

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section,

and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.

 This alarm code is indicated when a compression ratio, ε= {(Pd + 0.1) / (Ps + 0.1)} is calculated from

a discharge pressure (MPa) and suction pressure (MPa) and the condition lower than ε = 1.8 occurs more than 3 times including 3 in one hour.

Alarm Code

Does the inverter operate?

Yes

Does the compressor operate?

Is the four-way valve spindle mounted at middle position?

Are the high-pressure sensor and the low-pressure sensor good?

Yes

Check if the intake air temperature is too low at the indoor or outdoor units.

Replace the high-pressure sensor or the low-pressure sensor if faulty.

Check the compressor and power cable.

Check the inverter.

Replace the four-way valve if faulty.

Is there a leak in the Solenoid Valve for Hot Gas Bypass (SVA)?

Yes

Replace the Solenoid Valve (SVA) if faulty.

Yes

Cause

Check Item

Action

(Turn OFF Main Switch)

Phenomenon

Excessively Low Compression Ratio

Check compressor. Replace comp. if faulty.Compressor is not Operating

Check inverter. Repair faulty part.Inverter is not Functioning

Measure suction pipe temp. of 4-way valve.

Replace 4-way valve if faulty.

Valve Stoppage at Medium Position of 4-Way Valve

Check connector for PCB, power source and pressure indication.

Replace sensor if faulty.

Abnormality of High or Low Pressure Sensor

Check indoor unit and outdoor unit air temp. thermistor.

Replace thermistor if faulty.

Excessively Low Indoor Intake Air Temperature

Check Solenoid Valve.

Replace SVA if leaking.

Leakage from Solenoid Valve: SVA Outdoor Unit

Check Solenoid Valve.

Replace SVD1 and SVS1 if leaking.

Leakage from Solenoid Valve: SVD1, SVS1 of CH Unit

Activation to Protect System from Low Compression Ratio

Page 73

1-63

TROUBLESHOOTING

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section,

and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.

 This alarm code is indicated when the compressor is operated under the conditions higher than

0.9 MPa of suction pressure and its occurrence is more than 3 times including 3 in one hour.

Alarm Code

Activation to Protect System from Excessively Low Suction Pressure

Is there a leak in the solenoid valve SVA?

Is the low-pressure sensor good?

Check if the indoor/outdoor intake air temperature is too high.

Replace the low-pressure sensor if faulty.

Replace the solenoid valve SVA if faulty.

Yes

Is the four-way valve spindle mounted at middle position?

Replace the four-way valve if faulty.

Yes

Cause

Check Item

Action

(Turn OFF Main Switch)

Phenomenon

Excessively Low Suction Pressure

Check outlet pipe temp. of solenoid valve, SVA.

Check connecting wires. Replace solenoid valve, SVA if faulty.

Leakage of Solenoid Valve SVA

Measure suction gas pipe temp. of 4-way valve.

Replace 4-way valve if faulty.

Valve Stoppage at Medium Position of 4-Way Valve

Check connectors of PCB and power source.

Replace sensor if faulty.

Abnormal Suction Pressure Sensor

Check indoor unit and outdoor unit suction air temp. thermistor.

Replace thermistor if faulty.

Excessively High Indoor Unit and Outdoor Unit Suction Air Temperature

Check Solenoid Valve.

Replace SVD1 and SVS1 if leaking.

Leakage from Solenoid Valve: SVD1, SVS1 of CH Unit

Page 74

1-64

TROUBLESHOOTING

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section,

and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.

 This alarm code is indicated when the compressor is operated under the conditions higher than

2.65 MPa (26.5 kg/cm

G) of discharge pressure [ in case of FSG, FSG1 and FXG models, Pd is

higher than 2.84 MPa (28.4 kg/cm

G)] and its occurrence is more than 3 times including 3 in one

hour.

Alarm Code

Is the high-pressure sensor good?

Yes

Are ex. valves fully closed and locked?

Check if indoor or outdoor intake air temperature is too high.

Check the circuit board and connection of the circuit board connector. Replace the electronic expansion valves if faulty.

In the case of H-LINK connection, check the refrigeration cycle setting on the PCB of outdoor unit and indoor unit.

Check connection of the circuit board connector. Replace the high-pressure sensor if faulty.

Open the stop valve.

Is there a leakage of the solenoid valves SVA?

Replace the solenoid valve SVA if faulty.

Yes

Are electric wiring and refrigerant piping between the indoor and outdoor unit incorrectly connected?

Is the outdoor unit stop valve closed?

Yes

Correctly connect it.

Check the outdoor electronic expansion valve during cooling and the indoor electronic expansion valve during heating.

Yes

Activation to Protect System from Excessively High Discharge Pressure

Cause

Check Item

Action

(Turn OFF Main Switch)

Phenomenon

Excessively High Discharge Pressure

Check stop valve. Open stop valve.Closed Stop Valve

Check outlet temp. of solenoid valve, SVA.

Check connection. Replace solenoid valve SVA if faulty.

Leakage of Solenoid Valve SVA (Outdoor Unit)

Check thermistor for indoor unit and outdoor unit inlet air temp.

Replace thermistor if faulty.

Excessively High Indoor Unit and Outdoor Unit Inlet Air Temp.

Check connectors for PCB.

Replace pressure sensor if faulty.

Abnormal High Pressure Sensor

Check electrical system and ref. cycle.

Correctly connect.

Incorrect Connection between Indoor Unit and Outdoor Unit

Check connector for PCB.

Repair connector for PCB or ex. valve. Replace it if faulty.

Locked Ex. Valve with Fully Closed

Check solenoid valve SVD1 opening in heating.

Replace coil or CH unit if faulty.

Fully Closed Solenoid Valve SVD1 (CH Unit)

Stoppage of Indoor Fan <Wall Type Only>

Check continuity of fuses.

Replace fuses.Melted Fuses

Replace PCB and check operation.

Replace PCB if faulty.

Faulty PCB

Page 75

1-65

TROUBLESHOOTING

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section,

and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.

 This alarm code is indicated when the compressor is operated under the conditions lower than

0.6MPa (6kgf/cm2G) for an hour.

Alarm Code

Activation to Protect System from Excessively Low Discharge Pressure

(for Protection of Refrigerant Shortage)

Is the amount of refrigerant correct?

Correctly charge refrigerant.

0.1

Check the outdoor unit PCB1 by self-checking. Replace it if faulty.

Yes

Is the high-pressure in the alarm area?

Check for leakage of refrigerant.

Yes

Is the connector CN7 of outdoor unit PCB1 loose?

Plug the connector CN7 correctly.

Yes

Is the high-pressure sensor pipe clogged?

Is voltage between #1 and #3 of the connector CN7 of outdoor unit PCB1 12V, and voltage between #2 and #3 in the alarm area?

Remove clogging.

Yes

Replace the high-pressure sensor.

Yes

Connect pressure gauge at the check joint of the compressor discharge pipe.

0.3

0.6

0.9

(MPa) (V)

Discharge Pressure

Voltage between #2 and #3 of CN7

Alarm area

Outdoor Air Temperature (

Page 76

1-66

TROUBLESHOOTING

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section,

and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.

 This alarm code is indicated when a suction pressure is lower than 0.02 MPa (0.2 kg/cm

G) for over

12 minutes and its state occurs more than 3 times including 3 in one hour.

Alarm Code

Activation to Protect System from Excessively Low Suction Pressure

(Protection from Vacuum Operation)

Is the amount of refrigerant correctly?

Yes

Is the outdoor stop valve open?

Is refrigerant leaking?

Check if connections of electric wiring and refrigerant piping between the indoor and outdoor unit are wrong.

Check the indoor ex. valve during cooling and the outdoor ex. valve during heating.

Open the stop valve.

Correctly charge refrigerant.

Repair leaks.

Yes

Is suction pressure sensor normal?

Replace suction pressure sensor if faulty.

Yes

Are the electronic ex. valves fully closed and locked?

Check connection of the connectors and the circuit board. Replace the electronic ex. valves if faulty.

Yes

NOTE: In the case of H-LINK system, check the refrigerant

system setting of the outdoor PCB and indoor PCB.

Cause

Check Item

Action

(Turn OFF Main Switch)

Phenomenon

Check for conduction after temperature of outdoor fan motor is decreased.

Faulty Internal Thermostat

Replace outdoor fan motor.

Fault

Measure resistance by tester.

Remove looseness and replace connector.

Incorrect Contact

Check connection. Connect correctly.

Incorrect Connection

Excessively Low Suction Pressure (in Vacuum)

Internal Thermostat for Outdoor Fan is Activated in Heating Operation

Measure coil resistance and insulation resistance.

Replace outdoor fan motor if faulty.

Faulty Outdoor Fan Motor

Check ref. charged volume or check for leakage.

Repair leakage and correctly charge.

Shortage of Ref.

Check electrical system and ref. cycle.

Correctly connect between indoor unit and outdoor unit.

Incorrect Connection between Indoor Unit and Outdoor Unit

Check connector for PCB.

Repair or replace connector of PCB or ex. valve.

Locked Ex. Valve

Check connector for PCB.

Replace pressure sensor if faulty.

Abnormal Low or High Pressure Sensor

Check stop valve. Open stop valve.Closed Stop Valve

Check Td thermistors for compressors and measure Td thermistor resistance.

Repair or replace Td thermistor.

Closed Ex. Valve by Disconnecting Td Thermistor

Page 77

1-67

TROUBLESHOOTING

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section,

and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.

 This alarm code is indicated when the current transformer is abnormal (0A detection) and its state

occurs more than 3 times in 30 minutes.

Condition of Activation: When the frequency of compressor is maintained at 15 to 18Hz after compressor

is started, one of the absolute value of running current at each phase U+, U-, V+ and V- is less than 0.5A (including 0.5A).

Alarm Code

Abnormality of Current Transformer (0A Detection) (For 5HP to 20HP)

Replace Comp.

Restart operation.

Power wiring of Comp. is not through CT. Pass the wires through CT.

Faulty PCB3 and Replace PCB3 *2)

Compressor stops immediately. (nearly 18Hz)

Compressor is not operated. P17 is appeared. *1)

How is compressor operation when restarted?

Is the coil resistance of comp. normal?

Yes

Check transistor module.

Replace PCB3

Is output of transistor module correct? *2)

*1): P17 is shown at 7-segment on the outdoor unit PCB. *2): Perform the high voltage discharge work by referring to 1.3.6 before checking and replacing the inverter parts.

Page 78

1-68

TROUBLESHOOTING

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section,

and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.

 In case that the abnormality of alarm code 51, 52, 53 or 54 occurs three times within 30 seconds, the

alarm code of abnormality occurred for the third time is indicated. Retry operation is performed up to second time of abnormality occurrence.

Condition of Activation: When the frequency of compressor is maintained at 15 to 18Hz after compressor

is started, one of the absolute value of running current at each phase U+, U-, V+ and V- is less than 0.5A (including 0.5A).

Alarm Code

Abnormality of Current Transformer (For 24 and 30HP)

*1): P17 is shown at 7-segment on the outdoor unit PCB. *2): Perform the high voltage discharge work by referring to 1.3.6 before checking and replacing the inverter parts.

Replace Comp.

Restart operation.

Faulty ISPM and replace ISPM. *2)

Compressor stops immediately. (nearly 18Hz)

Compressor is not operated. P17 is appeared. *1)

How is compressor operation when restarted?

Is the coil resistance of comp. normal?

Yes

Check ISPM.

Is output of ISPM correct? *2) Or is output of voltage between U and V, V and W, W and U?

Page 79

1-69

TROUBLESHOOTING

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section,

and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.

 This alarm code is indicated when the electronic thermal relay for the inverter is activated 3 times

including 3 in 30 minutes. Retry operation is performed up to the occurrence of 2 times.

Conditions: Inverter current with 105% of the rated current, (1) runs continuously for 30 seconds or

(2) runs intermittently and the accumulated time reaches up to 3.5 minutes, in 10 minutes.

*1): Regarding the checking method for diode module, refer to page 1-113. *2): Regarding replacing or the checking of inverter components, refer to page 1-111 regarding electrical discharge.

Alarm Code

Protection Activation Against Instantaneous Overcurrent of Inverter (1)

(For 5 to 20HP)

Refer to next page.

Restart operation.

Abnormal

Smaller than activation current.

Yes (The circuit board is normal.)

Is discharge pressure high?

Check pressure and refrigeration cycle.

Is the compressor current larger than activation current?

Check the diode module. *1)

Check the inverter circuit board (PCB3) connection. *2)

Normal

"2"

"4"

Check for clogging of the heat exchanger.

Check the fan motor.

Replace the diode module.

Abnormal

Connect it correctly.

The inverter circuit board is faulty. Replace it.

Is the cause of stoppage " " of troubleshooting by 7-segments display "2" or "4"?

380-415V 50Hz 380V 60Hz

220V 60Hz

RAS-5FSG(3), RAS-8FSG(3), RAS-10FSG(3) RAS-16FSG(3), RAS-20FSG(3) RAS-8FXG(3), RAS-10FXG(3)

Model

14.0 / 25.0

16.5 / 30.0

14.0 / 25.0

Rated Current

Page 80

1-70

TROUBLESHOOTING

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section,

and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.

 This alarm code is indicated when the instantaneous overcurrent tripping occurs 3 times including 3

in 30 minutes. Retry operation is performed up to the occurrence of 2 times.

Conditions: Inverter current is 150% of the rated current.

1*): Regarding replacing or the checking method for the diode module, refer to page 1-113. 2*): Regarding the checking method for transistor module, refer to page 1-112. 3*): Regarding the checking of inverter components, refer to page 1-111 regarding electrical discharge.

Alarm Code

Protection Activation Against Instantaneous Overcurrent of Inverter (2)

(For 5 to 20HP)

Is the compressor running current as same as rated current?

Is it (a)V more during operation when other devices are operating?

Check the diode module. *1)

Is it (a)V or more during operation?

Replace the inverter circuit board.

Restart operation. Does it trip soon?

Are the input currents of three phases nearly equal? ( 3%)

Replace the transistor module.

Yes

Yes It trips.

No (Input currents out of balance.)

It trips immediately.

Faulty

Good

Is the supply voltage 380-415V±10% or 220V±10%?

Check the inverter circuit board. *3)

Check the compressor.

Check the power source capacity.

Is there any cause of instantaneous voltage decrease?

Check the transistor module. *2)

It trips occasionally.

It trips after a certain period.

Turn off power and disconnect U, V, W from compressor terminals. Turn ON #1 of DSW1 on PCB3 and restart. Does it trip?

Check the compressor.

Replace the diode module.

Replace the inverter circuit board.

Check the power supply.

Check the capacity and wiring of the power source.

Replace the inverter circuit board.

Yes (Input currents nearly equal (±3%).)

220V 60Hz

320

170

380-415V 50Hz 380V 60Hz

Power Supply Mark (a)

Page 81

1-71

TROUBLESHOOTING

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section,

and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.

 In case that the abnormality of alarm code 51, 52, 53 or 54 occurs three times within 30 seconds, the

alarm code of abnormality occurred for the third time is indicated. Retry operation is performed up to second time of abnormality occurrence.

Conditions: Inverter current with 105% of the rated current, (1) runs continuously for 30 seconds or

(2) runs intermittently and the accumulated time reaches up to 3.5 minutes, in 10 minutes.

*1): Regarding replacing or the checking of ISPM, refer to page 1-114 regarding electrical discharge.

Alarm Code

Protection Activation Against Instantaneous Overcurrent of Inverter (1)

(For 24 and 30HP)

Refer to next page.

Restart operation.

Smaller than activation current.

Yes (ISPM is normal.)

Is discharge pressure high?

Check pressure and refrigeration cycle.

Is the compressor current larger than activation current?

Check the inverter circuit board (ISPM) connection. *1)

Normal

"2"

"4"

Check for clogging of the heat exchanger.

Check the fan motor.

Replace ISPM.

Abnormal

Connect it correctly.

ISPM is faulty. Replace it.

Is the cause of stoppage " " of troubleshooting by 7-segments display "2" or "4"?

220V 60Hz

14.0A

27.5A

380-415V 50Hz 380V 60Hz

Power Supply Activation Current

380-415V 50Hz 380V 60Hz

220V 60Hz

RAS-24FSG1, RAS-30FSG1, RAS-24FS5, RAS-30FS5

Model

14.0 / 27.5

Rated Current

Page 82

1-72

TROUBLESHOOTING

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section,

and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.

 In case that the abnormality of alarm code 51, 52, 53 or 54 occurs three times within 30 seconds, the

alarm code of abnormality occurred for the third time is indicated. Retry operation is performed up to second time of abnormality occurrence.

Conditions: Inverter current is 150% of the rated current.

1*): Regarding replacing or the checking method for ISPM, refer to page 1-114. 2*): Before the checking of ISPM, refer to page 1-111 regarding electrical discharge.

Alarm Code

Protection Activation Against Instantaneous Overcurrent of Inverter (2)

(For 24 and 30HP)

Is the compressor running current as same as rated current?

Check ISPM. *1)

Restart operation. Does it trip soon?

Are the input currents of three phases nearly equal? ( 3%)

Yes

Yes It trips.

No (Input currents out of balance.)

It trips immediately.

Faulty

Good

Check the compressor.

Check the power source capacity.

Is there any cause of instantaneous voltage decrease?

It trips occasionally.

It trips after a certain period.

Turn off power and disconnect U, V, W from compressor terminals. Turn ON #1 of DSW1 on ISPM and restart. Does it trip?

Check the compressor.

Replace ISPM. *2)

Check the power supply.

Yes (Input currents nearly equal (±3%).)

Is it (a)V more during operation when other devices are operating?

Is it (a)V or more during operation?

Yes

Is the supply voltage 380-415V±10% or 220V±10%?

Check the capacity and wiring of the power source.

220V 60Hz

320

170

380-415V 50Hz 380V 60Hz

Power Supply Mark (a)

Page 83

1-73

TROUBLESHOOTING

Yes

Faulty

Check the inverter circuit board. *2)

Turn off power, disconnect U, V, W from compressor terminals and restart. Does the protecting function activate? *3)

Check the transistor module (5 to 20HP) or the ISPM (24 and 30HP). *1)

Good

Is the heat exchanger of outdoor unit clogged?

Check the compressor. (If there is a short-circuit between phase lines, replace the compressor.)

Replace the transistor module and inverter circuit board.

Replace the transistor module.

Replace the inverter circuit board (5 to 20HP) or ISPM (24 and 30HP).

Remove clogging.

Replace ISPM.

5 to 20HP

24 and 30HP

Yes

Is the silicon grease coated all over between the transistor module and the radiated fin? (5 to 20HP) Is the silicon grease coated all over between the ISPM and the radiated fin? Is the fixed screw on ISPM loose? (24 and 30HP)

Coat the silicon grease to all the touched face between the transistor module and the radiated fin fully (5 to 20HP). Coat the silicon grease to all the touched face between the ISPM and the radiated fin fully. Fix the screw correctly (24 and 30HP). *4)

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section,

and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.

 Transistor module (5 to 20HP) or ISPM (24 and 30HP) have detecting function of abnormality.

This alarm is indicated when the transistor module detect the abnormality 3 times in 30 minutes including 3. Retry operation is performed up to the occurrence of 2 times. (In Case of 5 to 20HP) In case that the abnormality of alarm code 51, 52, 53 or 54 occurs three times within 30 seconds, the alarm code of abnormality occurred for the third time is indicated. Retry operation is performed up to second time of abnormality occurrence. (In Case of 24 and 30HP)

Conditions: Abnormal Current to the Transistor Module (5 to 20HP) or ISPM (24 and 30HP) such as

Short Circuited or Grounded or Abnormal Temperature of the Transistor Module (5 to 20HP) or ISPM (24 and 30HP) or Control Voltage Decrease

1*): Regarding replacing or checking method for the transistor module (5 to 20HP) and the inveter components (24

and 30HP), refer to pages 1-112 and 1-114. 2*): Before the checking of inverter components, refer to page 1-111 regarding electrical discharge. 3*): Turn ON the No.1 switch of the dip switch DSW1 on PCB3/ISPM when restarting with disconnecting

theterminals of the compressor. After troubleshooting, turn OFF the No.1 switch of the dip switch DSW1 on

PCB3/ISPM (5 to 20HP/24 and 30HP). 4*): Use the silicon grease provided as accessory (Service Parts No.: P22760).

Alarm Code

Protection Activation of Transistor Module (5 to 20HP)

or ISPM (24 and 30HP)

Page 84

1-74

TROUBLESHOOTING

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section,

and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.

 In case that the abnormality of alarm code 51, 52, 53 or 54 occurs three times within 30 seconds, the

alarm code of abnormality occurred for the third time is indicated. Retry operation is performed up to

second time of abnormality occurrence.

Conditions: This alarm is indicated when the temperature of the internal themostat for ISPM is higher

than 100oC.

1*): Regarding replacing or checking method for ISPM, refer to page 1-114. 2*): Use the silicon grease provided as accessory (Service Parts No.: P22760).

Alarm Code

Increase in Inverter Fin Temperature (Only 24 and 30HP)

Yes

Restart operation. Does it trip soon?

Is the heat exchanger of outdoor unit clogged?

Apply the silicon grease between ISPM and fin securely. *2)

Replace the ISPM.

Replace the ISPM. *1)

Remove clogging.

Yes

Is the silicon grease coated securely between ISPM and fin?

Page 85

1-75

TROUBLESHOOTING

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section,

and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.

 This alarm is indicated when the revolution pulse output from the fan motor is 10rpm or less and the

reverse revolution signal is detected. The fan motor is stopped once, and restarted after 10 seconds.

It occurs more than 10 times in 30 minutes, this alarm is indicated. The abnormality occurs when the

fan motor is stopped.

Alarm Code

Abnormality of Fan Motor Protection

(Only 24 and 30HP 220V/60Hz)

Are the connectors abnormal?

Good

Replace the fan motor.

In the case that the fan motor does not run even the PCB is replaced, replace ISPM.

Remove the foreign matter.

Does the motor run?

This alarm is indicated due to detected overcurrent by the

contrary wind. This is normal. No Alarm code is not indicated.

Yes

Does the fan stop by the foreign matter?

Yes

Connect it correctly.

Faulty

Restart operation.

Check to remove the connector CN14 on PCB1 and CN201, CN203, CN206 and CN207 on ISPM and CN15 and CN110 of trunk connector.

This is normal.

Yes

Alarm code is not indicated.

This is normal.

Yes

Replace the PCB or the fan controller.

Does the motor run?

Restart operation.

Does the motor run?

Restart operation.

Page 86

1-76

TROUBLESHOOTING

 “RUN” light flickers and “ALARM” is indicated on the remote control switch.  The unit No., alarm code and the unit code is alternately indicated on the set temperature section,

and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.

 This alarm code is indicated when a current value of AC chopper becomes (1) less than 0.5A when

outdoor unit fan is operating, or (2) more than 2A while outdoor unit fan stops.

Alarm Code

Abnormality of AC Chopper Circuit Board

(Only for 5 to 20HP & 24, 30HP 380-415/380V 50/60Hz)

Yes

Is the connection of CT5 at outdoor circuit board (PCB1) right?

Is outdoor unit fan operating during the indication of alarm code?

Is the connection of CN13 at outdoor unit circuit board (PCB1) and CN201 at AC chopper circuit board right?

Abnormality of AC chopper circuit board (PCB2).

Yes

Connect CT5 correctly.

Connect correctly.

Yes

Is the connection of S3, R3 at outdoor unit circuit board (PCB1) or faston of EF9 and S1, R1 at AC chopper circuit board right?

Connect correctly.

Faulty AC chopper. Replace the AC chopper.

Replace fuse.

Abnormality of CT5.

Yes

Is the fuse of EF9 melted?

Yes

Is outdoor unit fan operated for more than 2 seconds when the unit is restarted?

Is the connection of MAIN1, COM1, SUB1 at AC chopper circuit board right?

Yes

Is the connection of relay connector CN1 for outdoor fan motor right?

Page 87

1-77

TROUBLESHOOTING

 This alarm code is indicated only when remote control switch PC-2H2 is used being connected to

indoor unit.

 This alarm occurs in the case of incorrect connection like that TL terminal is connected to Vc terminal

as below when indoor units are wired.

The unit No. and unit code are as below regardless of the indoor unit being connected to the remote control switch.

Indoor Unit No. 00 Cycle System 00 Unit Code E.00

Alarm Code

Incorrect Wiring Among Indoor Units

Yes

Is wiring among indoor units right?

JP4

Repair the wiring among indoor units.

Turn off the main power switch and cut the wire JP4 at remote control switch, then turn on the main power switch again.

Cause

Check Item

Action

(Turn OFF Main Switch)

Phenomenon

Wiring Trouble

Check the wiring No.

Repair the wiring correctly.

Incorrect Wiring

CN13(blue)

Vc T

CN12(yellow)

Vc T

I. U. 1

CN13(blue)

Vc T

CN12(yellow)

Vc T

Vc TG T

Remote Control

Switch (yellow)

Remote Control Switch

Incorrect Wiring

Page 88

1-78

TROUBLESHOOTING

 This alarm code appears when one of the following alarms occurs three times within 6 hours, which

may result in serious compressor damages, if the outdoor unit is continuously operated without removing the cause.

Alarm Code: Content of Abnormality

02 Tripping of Protection Device in Outdoor Unit

07 Decrease in Discharge Gas Superheat

08 Increase in Discharge Gas Temperature

39 Abnormality of Running Current at Constant Comp.

43 Pressure Ratio Decrease Protection Activating

44 Low Pressure Increase Protection Activating

45 High Pressure Increase Protection Activating

46 High Pressure Decrease Protection Activating

47 Low Pressure Decrease Protection Activating

These alarms are able to be checked by the CHECK Mode 1. Follow the action indicated in each alarm chart. These alarms are cleared only by turning OFF the main power switch to the system. However,

careful attention is required before starting, since there is a possibility which will result in serious damages to the compressors.

Alarm Code

Compressor Protection

Page 89

1-79

TROUBLESHOOTING

1.2.3 Troubleshooting in Check Mode by Remote Control Switch

Check Mode 1: Current data will be displayed.

Check Mode 2: Data held immediately before

failure, will be displayed.

Check Mode

Normal Mode

(PC-P1H)

Check Mode Released

 Use the remote control CHECK switch in the following cases.

(1) When the RUN lamp is flashing. (2) To trace back the cause of trouble after restarting from

stoppage with the RUN lamp flashing. (3) To check during normal operation or stoppage. (4) To monitor the temperatures of intake and discharge air.

 Forward: Press the switch to rise

from 00 to 01 to 02 …

 Backward: Press the switch to descend

from 15 to 14 to 13 …

 Indication will delay as transmission between the remote

control switch and indoor unit takes about 10 seconds.

 All data may be displayed as "FF" or "-1" or "255".

These transient data produced temporarily by software do not affect device functions at all. (The alarm code may also be indicated as "FF".)

 In Check Mode 2, Data of the first

three units connected serially to a remote control switch are available.

 You can press the CHECK switch to

release Check Mode 2. Check Mode 1 cannot be released even if you press the CHECK switch.

Alarm Code Identifying the Last Fault that has Occurred in the Indicated Unit. Unit number of connected unit or unit number for which checking mode was selected previously.

Unit Number and Alarm Code Displayed

After 7 seconds

Perform within 7 seconds to check another unit.

(A)

Press for more than 3 seconds.

To View the Previous Indication

TEMP

Press

CHECK

Press for more than 3 seconds.

CHECK

Press

CHECK

Unit Number and Alarm Code Displayed

Check Mode 1 (See page 1-80 for details.)

Press to view the next data. Press to view the previous data.

Check Mode 2 (See page 1-83 for details.)

COOL

HIGH

A/C

ADDS. RN

CHECK

COOL

HIGH

A/C

CHECK

COOL

HIGH

A/C

CHECK

COOL

HIGH

A/C

CHECK

COOL

HIGH

VENTI

A/C

CHECK

COOL

HIGH

A/C

ADDS. RN

CHECKCHECK

After 7 seconds

See (A)

To View the Next Indication

TEMP

Press

TEMP

Press

TEMP.

RUN / STOP

MODE

FAN SPEED

VENTI

RESET

CHECK

LOUVER

ON/OFF TIMER

TIME

NO FUNCTION

FAN COOL HEAT DRY AUTO

HIGH MED LOW A/C VENT

SWING

DEFROST CENTRAL H.STRG

SERVICE

ON/OFF TIMER

SET TEMP.

FILTER

T. RU N

ABNML

CHECK

ADDS

UNIT

LOUVER

Page 90

1-80

TROUBLESHOOTING

Although the wireless remote controller is used for wall type indoor unit with built-in receiver part, the alarm code can be checked by connecting PC-P1H to the connector (Blue) of the unit as shown below and pressing the operation switch.

NOTES:

1. The unit is not operated by pressing operation switch.

2. The above function is available only when alarm occurs.

3. The PCB check by remote controller is not available.

4. The indication is the data when connecting PC-P1H, not the data before the alarm occurs.

(1) Contents of Check Mode 1

The next indication is shown by pressing the part of “TEMP” switch. If the part of “TEMP” switch is pressed the previous indication is shown.

Temperature Indication

Normal

Thermistor Open-circuited or PCB Defected

(Temp. for Top of Comp.: 129)

……

Temperature Displayed

Abnormal

Indication of Category Code Indication of Temperature, etc.

Indoor Unit Temp. Setting (

Indoor Unit Intake Air Temp. at Thermistor (

Indoor Unit Discharge Air Temp. at Thermistor (

Indoor Unit Heat Exchanger Liquid Pipe Temp. (

Temperature at Remote Sensor (

Outdoor Unit Ambient Air Temp. (

Indoor Unit Heat Exchanger Gas Pipe Temp. (

Outdoor Unit Evaporating Temp. during Heating (

Control Information9

Discharge Gas Temp. at the Top of Comp. Chamber (

See "1.3.1 Self-Checking of PCB's using Remote Control Switch" in pages 1-103, 104.

(NOTE 1) During transient period such as starting time, etc.,

"- -" may be indicated for a limited time.

This is indicated only when a remote sensor is connected. The indication of "- -" is normally indicated. RPK series can not connect a remote sensor. Therefore indication is "- -".

to next page

- -

129

Thermistor Short-circuited or PCB Defected)

F F

255

(Temp. for Top of Comp.: 127)

127

This indicates the internal information for the remote control switch. In case of SET-FREE, this indication shows the operating compressor quantity.

(ex.) During two compressors operation, average

temperature of two compressors is indicated.

In case that temperature is higher than 126

C, " ".

Page 91

1-81

TROUBLESHOOTING

Indication on Micro-Computer Input/Output

Thermo Temp. of Remote Control Switch

Micro-Computer Input/Output in Outdoor Unit

Cause of Stoppage

Abnormality Occurrence Times

Instantaneous Power Failure Occurrence Times in Indoor Unit

Abnormality Occurrence Times on Inverter

Transmission Error Occurrence Times between Remote Control Switch and Indoor Unit

Louver Sensor19

Micro-Computer Input/Output in Indoor Unit

Heating Thermo-ON

Cooling Thermo-ON

Dark

Alarm

Operation

52H

to next page

Countable up to 99. Over 99 times, "99" is always indicated. (NOTE 1) If a transmitting error continues for 3 minutes, one

is added to the occurrence times.

(NOTE 2) The memorized data can be canceled by the

method indicated in 1.3.1 "Self-checking of PCBs using Remote Control Switch" in pages 1-103, 104.

Symbols with a letter Y are relays on PCB

00 Operation OFF, Power OFF 01 Thermo-OFF (NOTE 1) 02 Alarm (NOTE 2) 03 Freeze Protection, Overheating Protection 05 Instantaneous Power Failure at Outdoor Unit, Reset

(NOTE 3) 06 Instantaneous Power Failure at Indoor Unit, Reset (NOTE 4) 07 Stoppage of Cooling Operation due to Low Outdoor Air

Temperature, Stoppage of Heating Operation due to

High Outdoor Air Temperature 08 Compressor Quantity Changeover, Stoppage (HP > 8) 09 Demand of 4-Way Valve Changeover Stoppage (FX Only) 10 Demand, Enforced Stoppage 11 Retry due to Pressure Ratio Decrease 12 Retry due to Low Pressure Increase 13 Retry due to High Pressure Increase 14 Retry due to Abnormal Current of Constant Compressor

(HP > 8) 15 Retry due to Abnormal High Temperature of Discharge

Gas, Excessively Low Suction Pressure 16 Retry due to Decrease of Discharge Gas Superheat 17 Retry due to Inverter Tripping 18 Retry due to Voltage Decrease 19 Expansion Valve Opening Change Protection 20 Operation Mode Changeover of Indoor Unit (NOTE 5)

(NOTE 1) Explanation of Term,

Thermo-ON: A condition that an indoor unit is

requesting compressor to operate.

Thermo-OFF: A condition that an indoor unit is not

requesting compressor to operate.

(NOTE 2) Even if stoppage is caused by "Alarm", "02" is not

always indicated.

(NOTE 3) If transmission between the inverter printed circuit board

and the control printed circuit board is not performed during 30 seconds, the outdoor unit is stopped. In this case, stoppage is d1-05 cause and the alarm code "04" may be indicated.

(NOTE 4) If transmission between the indoor unit and the

outdoor unit is not performed during 3 minutes, indoor units are stopped. In this case, stoppage is d1-06 cause and the alarm code "03" may be indicated.

(NOTE 5) In the FSG and FS3 system "20" will be indicated

at the difference mode between indoor units.

Indication of Unit Stoppage Cause

Abnormality Occurrence Counter

Indication of Automatic Louver Condition

Y52C2

Y212

Dark

Y211

Y52C1

Y20B

Y20A

Outdoor Fan

TEMP.

RUN / STOP

MODE

FAN SPEED

VENTI

RESET

CHECK

LOUVER

ON/OFF TIMER

TIME

NO FUNCTION

FAN COOL HEAT DRY AUTO

HIGH MED LOW A/C VENT

SWING

DEFROST CENTRAL H.STRG

SERVICE

ON/OFF TIMER

SET TEMP.

FILTER

T. RU N

ABNML

CHECK

ADDS

UNIT

LOUVER

Page 92

1-82

TROUBLESHOOTING

Compressor Pressure/Frequency Indication

Discharge Pressure (High) (x 0.1 MPa)

Suction Pressure (Low) (x 0.01 MPa)

Control Information22

Operation Frequency (Hz)

Outdoor Unit Code25

Refrigerant Cycle Number

Indoor Unit Capacity24

The total current is indicated when several compressors are running. In case of inverter compressor, the running current of primary side of inverter is indicated.

Capacity Code of Indoor Unit

06 0.8 08 1.0 10 1.3 13 1.5 14 1.8 16 2.0 18 2.3 20 2.5 22 2.8 26 3.0 32 4.0 40 5.0 64 8.0 80 10.0

Indication Code Equivalent Capacity (HP)

J3: 01~16 (01: when shipment (DSW5), Decimal Indication) J4: 00~0F (00: when shipment (DSW5), Indication with 16 numbers)

In case of models without Expansion Valve (MV2), the same figure is indicated.

FX Series Only

This is an indication for internal information for the remote control switch. This does not have any specific meaning.

The total frequency is indicated when two compressors are running.

The capacity of the indoor unit is indicated as shown in the table below.

Indoor Unit Capacity Indication

Outdoor Unit Expansion Valve MV1 Opening (%)

Outdoor Unit Expansion Valve MV2 Opening (%)

Outdoor Unit Expansion Valve MVB Opening (%)

Indoor Unit Expansion Valve Opening (%)

Expansion Opening Indication

Compressor Running Current (A)

Estimated Electric Current Indication

Temperature Indication

Returns to Temperature Indication

"n" indicates total number of indoor units; n = ~

,,,,,,,

(10) (11) (12)(13) (14) (15) (16)

Page 93

1-83

TROUBLESHOOTING

Temperature Indication

Normal

Thermistor Open-circuited or PCB Defected

(Temp. for Top of Comp.: 129)

……

Temperature Displayed

Abnormal

Indication of Category Code Indication of Temperature, etc.

Indoor Unit Intake Air Temp. at Thermistor (

Indoor Unit Discharge Air Temp. at Thermistor (

Indoor Unit Heat Exchanger Liquid Pipe Temp. (Freeze Protection) (

Outdoor Air Temp. (

Indoor Heat Exchanger Gas Pipe Temp. (

Evaporating Temp. at Heating (

Control Information7

Discharge Gas Temp. at the Top of Comp. Chamber (

See "1.3.1 Self-Checking of PCB's using Remote Control Switch" in pages 1-103, 104.

(NOTE 1) During transient period such as starting time, etc.,

"- -" may be indicated for a limited time.

(NOTE 2) All the data during the check mode 2 will be

changed to "00" if a power failure occurs during alarm indication.

to next page

- or

129

Thermistor Short-circuited or PCB Defected)

F F

255

(Temp. for Top of Comp.: 127)

127

This is an indication for internal information for the remote control switch. This does not have any specific meaning.

The average temperature is indicated when two compressors are running.

(2) Contents of Check Mode 2

The latest data of the first three indoor units only connected serially are indicated when more than three indoor units are connected to one remote control switch. By pressing the part of “TEMP” switch, the next display is indicated, If the part of “TEMP” switch is pressed, the previous display is indicated.

Page 94

1-84

TROUBLESHOOTING

Compressor Pressure/Frequency Indication

Discharge Pressure (High) (x 0.1 MPa)

Suction Pressure (Low) (x 0.01 MPa)

Control Information11

Operating Frequency (Hz)

The total value is indicated when plural compressors are running.

This is an indication for internal information for the remote control switch. This does not have any specific meaning.

The total frequency is indicated when plural compressor are running.

Outdoor Unit Expansion Valve MV1 Opening (%)

Indoor Unit Expansion Valve Opening (%)

Expansion Opening Indication

Compressor Running Current (A)

Estimated Electric Current Indication

Temperature Indication

Returns to Temperature Indication

Page 95

1-85

TROUBLESHOOTING

1.2.4 Troubleshooting by 7-Segment Display

(1) Checking Method by 7-Segment Display

By using the 7-segments and check switch (PSW) on the PCB1 in the outdoor unit, total quantity of combined indoor units, 7-segments operation conditions and each part of refrigeration cycle, can be checked.

Output State of Outdoor Micro-Computer

Checking Item

PSW

7-Segment

PSW3

SEG3

PSW2

Y20D

Y20A

Y20C

Y52C3

Y21

YOH

Y20B

PSW3 PSW2

 To start checking, press the "PSW2" switch

for more than 3 seconds.

 To proceed checking, press the "PSW2" switch

for less than 2 seconds.

 To proceed reversely, press the "PSW3" switch

for less than 2 seconds.

 To cancel this checking, press the "PSW2"

switch for more than 3 seconds. The display will be changed to the indication one step before. Then, press the "PSW2" switch once again for more than 3 seconds.

Backward Forward

PSW2 PSW3

Total of Thermo-ON Indoor Units Capacity

PSW3 PSW2

PSW2 PSW3

Running Frequency of Inverter Compressor MC1

Checking Contents

(Unit)

(Hz)

PSW3 PSW2

PSW2 PSW3

Number of Running Compressor

PSW3 PSW2

PSW2 PSW3

(x HP)

(%)

Air Flow Ratio

PSW3 PSW2

PSW2 PSW3

Outdoor Expansion Valve MV1 Opening

PSW3 PSW2

PSW2 PSW3

Outdoor Expansion Valve MV2 Opening

PSW3 PSW2

PSW2 PSW3

(For 16 to 30HP)

Y52C4

Y52C1

YFAN2

AC Chopper

YRS

Y52C2

SEG2 SEG1

PSW4

Check

Manual Defrost

Ref. Cycle Auto Check

PSW3PSW2PSW1

Page 96

1-86

TROUBLESHOOTING

Discharge Pressure (High)

Checking Item

from Previous Page

PSW3 PSW2

PSW2 PSW3

Suction Pressure (Low)

PSW3 PSW2

PSW2 PSW3

Discharge Gas Temperature on the Top of Compressor MC1 (TD1)

Checking Contents

(MPa)

PSW3 PSW2

Discharge Gas Temperature on the Top of Compressor MC2 (TD2)

PSW2 PSW3

: Open-circuited : Short-circuited

PSW3 PSW2

PSW2 PSW3

PSW3 PSW2

PSW2 PSW3

PSW3 PSW2

(oC)

: Open-circuited : Short-circuited

(oC)

: Open-circuited : Short-circuited

(oC)

: Open-circuited : Short-circuited

(oC)

: Open-circuited : Short-circuited

(oC)

: Open-circuited : Short-circuited

(oC)

: Open-circuited : Short-circuited

PSW2 PSW3

PSW3 PSW2

PSW2 PSW3

(For 8 to 30HP)

(For 24, 30HP)

PSW3 PSW2

PSW2 PSW3

Discharge Gas Temperature on the Top of Compressor MC3 (TD3)

(For 16 to 30HP)

Discharge Gas Temperature on the Top of Compressor MC4 (TD4)

Evaporating Temperature 1 at Heating

Evaporating Temperature 2 at Heating

PSW3 PSW2

PSW2 PSW3

(For 16 to 30HP)

Evaporating Temperature 3 at Heating

(For 24, 30HP)

(For 20 to 30HP)

(%)

Outdoor Expansion Valve MV3 Opening

PSW3 PSW2

PSW2 PSW3

Outdoor Expansion Valve MVB Opening

PSW3 PSW2

PSW2 PSW3

Page 97

1-87

TROUBLESHOOTING

Estimated Running Current of Compressor MC3

Checking Item

from Previous Page

PSW3 PSW2

PSW2 PSW3

PSW3 PSW2

PSW2 PSW3

Indoor Unit Expansion Valve Opening

(No.0 Unit)

(No.F Unit)

Checking Contents

PSW3 PSW2

PSW2 PSW3

PSW3 PSW2

PSW2 PSW3

(oC)

(A)

(No.0 Unit)

(%)

(No.F Unit)

(%)

(No.0 Unit)

(oC)

(No.F Unit)

(For 16 to 30HP)

Estimated Running Current of Compressor MC4

(For 20 to 30P)

(Indicates only the units number connected)

Indoor Unit Heat Exchanger Liquid Pipe Temperature (Freeze Protection)

(No.0 Unit)

(No.F Unit)

PSW2 PSW3

PSW3 PSW2

PSW2 PSW3

(Indicates only the units number connected)

(

(No.0 Unit)

(oC)

(No.F Unit)

Indoor Unit Heat Exchanger Gas Pipe Temperature

(No.0 Unit)

(No.F Unit)

PSW2 PSW3

PSW3 PSW2

PSW2 PSW3

(Indicates only the units number connected)

(A)

(oC)

: Open-circuited : Short-circuited

Indicates running current of primary side of inverter.

(For 8 to 30HP)

Ambient Air Temperature (TO)

PSW3 PSW2

PSW2 PSW3

Estimated Running Current of Compressor MC1

PSW3 PSW2

PSW2 PSW3

PSW3 PSW2

PSW2 PSW3

Estimated Running Current of Compressor MC2

Page 98

1-88

TROUBLESHOOTING

Checking Item

from Previous Page

Indoor Unit Discharge Air Temperature

(No.0 Unit)

(No.F Unit)

Checking Contents

PSW3 PSW2

PSW2 PSW3

PSW3 PSW2

PSW2 PSW3

(oC)

(No.0 Unit)

(No.F Unit)

(No.0 Unit)

(oC)

(No.F Unit)

(Indicates only the units number connected)

Refer to the "Capacity Code of Indoor Unit" table for the capacity code indication.

Indoor Unit Capacity Setting

(No.0 Unit)

(No.F Unit)

PSW3 PSW2

PSW2 PSW3

PSW3 PSW2

PSW2 PSW3

(Indicates only the units number connected)

(No.F Unit)

: Degeneration Control is

in Operation

: Degeneration Control is not

in Operation

(No.0 Unit)

Refer to page 1-81.

Indoor Unit Cause of Stoppage

(No.0 Unit)

(No.F Unit)

PSW3 PSW2

PSW2 PSW3

PSW3 PSW2

PSW2 PSW3

(Indicates only the units number connected)

Pressure Ratio Fall Protection Degeneration Control

PSW3 PSW2

PSW2 PSW3

: Degeneration Control is

in Operation

: Degeneration Control is not

in Operation

High-Pressure Rise Protection Degeneration Control

PSW3 PSW2

PSW2 PSW3

: Degeneration Control is

in Operation

: Degeneration Control is not

in Operation

Discharge Gas Temp. Increase Protection Degeneration Control

PSW3 PSW2

PSW2 PSW3

(x HP)

PSW3 PSW2

(oC)

(No.0 Unit)

(oC)

(No.F Unit)

Indoor Unit Intake Air Temperature

(No.0 Unit)

(No.F Unit)

PSW2 PSW3

PSW3 PSW2

PSW2 PSW3

(Indicates only the units number connected)

Refer to page 1-81.

Page 99

1-89

TROUBLESHOOTING

Checking Item

from Previous Page

Checking Contents

(x 10 times hours)

Current Protection Degeneration Control

PSW3 PSW2

PSW2 PSW3

: Degeneration Control is

in Operation

: Degeneration Control is not

in Operation

Total Accumulated hours of Compressor MC1

PSW3 PSW2

PSW2 PSW3

(x 10 times hours)

Total Accumulated hours of Compressor MC2

PSW3 PSW2

PSW2 PSW3

(x 10 times hours)

Total Accumulated hours of Compressor MC3

PSW3 PSW2

PSW2 PSW3

(x 10 times hours)

Total Accumulated hours of Compressor MC4

PSW3 PSW2

PSW2 PSW3

The Latest Alarm Code Cause of Stoppage at Outdoor Unit

PSW3 PSW2

PSW2 PSW3

Cause of Stoppage at Inverter

PSW3 PSW2

PSW2 PSW3

Total Capacity Setting of Indoor Unit

PSW3 PSW2

PSW2 PSW3

Total Quantity of Combined Indoor Unit

PSW3 PSW2

PSW2 PSW3

Address of Refrigerant System

PSW3 PSW2

PSW2 PSW3

(sets)

(x HP)

(For 8 to 30HP)

(For 16 to 30HP)

(For 20 to 30HP)

displayed in 4 digit number

The latest alarm code of stoppage cause is indicated.

Indicates setting address by DSW1

Returns to START " "

: Degeneration Control is

in Operation

: Degeneration Control is not

in Operation

Discharge Gas Temp. Decrease Protection Degeneration Control

PSW3 PSW2

PSW2 PSW3

Page 100

1-90

TROUBLESHOOTING

Upper Limit

Lower Limit

Invent Primary Current (A)

30252015105

Running Current of Compressor MC1 Indicated on 7- segment

(2) Running Current of Compressor  Inverter Primary Current

The inverter primary current is estimated from the running current of the compressor MC1 indicated on 7-segments, as chart below.

Remark

Cause of Stoppage for Corresponding Unit

Automatic Stoppage of Transistor Module (IPM Error) (Over Current, Decrease Voltage, Increase Temperature)

Instantaneous Over Current

Electronic Thermal Activation

Inverter Voltage Decrease

Increase Voltage

Abnormal Current Sensor

Instantaneous Power Failure Detection

Reset of Micro-Computer for Inverter

Code Cause

Alarm Code

Indication during Retry

Abnormal Inverter Fin Thermistor

Earth Fault Detection for Compressor (Only Starting)

Abnormal Power Source Phase

 Indicated Running Current of Compressor MC2, MC3, MC4

The running current of the compressor MC2, MC3, MC4 is detected by current sensor. (CT2 to CT4)

 Cause of Stoppage for Inverter (Content of Check Item " ")