Mitsubishi SLZ-KA25VAL3 Series, SLZ-KA25VAL3.TH, SLZ-KA50VAL3 Series, SLZ-KA35VAL3 Series, SLZ-KA25VAL3.TH-ER Technical & Service Manual

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

TECHNICAL & SERVICE MANUAL

June 2014

No. OCH564

Indoor unit
[Model Name] [Service Ref.]

SLZ-KA25VAL3

SLZ-KA25VAL3.TH

SLZ-KA25VAL3.TH-ER

SLZ-KA35VAL3

SLZ-KA35VAL3.TH

SLZ-KA35VAL3.TH-ER

SLZ-KA50VAL3

SLZ-KA50VAL3.TH

SLZ-KA50VAL3.TH-ER

Note:

• This manual describes only
service data of the indoor units.

Model name
indication

ON/OFF

TOO

TOO

WARM

COOL

FAN

SELECT

AUTO COOL

TIME

VANE

DRY

HEAT

MODE

RESET

REMOTE CONTROLLER

INDOOR UNIT

WIRED REMOTE CONTROLLER

(Option)

CONTENTS

1. REFERENCE MANUAL

2. PARTS NAMES AND FUNCTIONS

3. SPECIFICATIONS

4. OUTLINES AND DIMENSIONS

5. WIRING DIAGRAM

6.

REFRIGERANT SYSTEM DIAGRAM

7. TROUBLESHOOTING

8. 4-WAY AIR FLOW SYSTEM

9. DISASSEMBLY PROCEDURE

......................

...............................

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..............

..........

PARTS CATALOG (OCB564)

.....

...........

.....

2
2
6

8
11
12
13
27
29

Use the specied refrigerant only

OCH564

Never use any refrigerant other than that specied.

Doing so may cause a burst, an explosion, or re when the unit is being used, serviced, or disposed of.
Correct refrigerant is specied in the manuals and on the spec labels provided with our products.
We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused
by failure to follow the instructions.

1

REFERENCE MANUAL

1-1. OUTDOOR UNIT’S SERVICE MANUAL

Service Ref. Service Manual No.

SUZ-KA25/35/50VA4.TH

OCH545/OCB545

1-2. TECHNICAL DATA BOOK

Series (Outdoor unit) Data Book No.

SUZ-KA

•

VA4 OCS26

2

PARTS NAMES AND FUNCTIONS

2-1. INDOOR UNIT

Horizontal Air Outlet
Sets horizontal airflow automatically

during cooling or dehumidifying.

Filter
Removes dust and pollutants

from drawn in air.

Grille

Auto Air Swing Vane
Disperses airflow up and

down and adjusts the angle
of airflow direction.

Air Intake
Draws in air from room.

2-2. WIRELESS REMOTE CONTROLLER

OCH564

TEMPERATURE
SETTING button

To set any

h

temperature.

desired room

ON/OFF

TOO

WARM

TOO

COOL

ON / OFF button

To start and to stop operation.

MODE SELECT button

To change the operation
mode; Auto, Cooling ,
Heating and Drying . (SLZ)

AUTO COOL

DRY

HEAT

MODE

FAN

VANE

SELECT

TIME

RESET

TIMER SELECT button

To set time to start or stop
unit operation.

FAN SPEED button

To set fan speed to Low,
Medium or High.

VANE CONTROL button

To change the airflow
direction.

Attention:

• Avoid pushing buttons with fingernails and other sharp objects. Sharp objects may damage remote controller.

33

2-3. Wired remote controller (Option) PAR-31MAA

OCH564

The functions which can be used are restricted according to each model.

Display

Full mode

6

7

8

9

10

1

11

The main display can be displayed in two different modes: "Full" and "Basic."
The initial setting is "Full."

15

13

14

12

Room

Cool Auto

Mode Temp. Fan

Set temp.

21

Basic mode

Cool

1

Mode Temp. Fan

Note: All icons are displayed for explanation.

1 Operation mode

Indoor unit operation mode appears here.

181716

3

Fri

19

20

2 Preset temperature

Preset temperature appears here.

3 Clock

(See the Installation Manual.)

Current time appears here.

4 Fan speed

4

Fan speed setting appears here.

5 Button function guide

Functions of the corresponding buttons appear

2

5

here.

6

Appears when the ON/OFF operation is centrally
controlled.

7

2

3

Fri

AutoSet temp.

4

Appears when the operation mode is centrally
controlled.

8

Appears when the preset temperature is centrally
controlled.

9

Appears when the filter reset function is centrally
controlled.

10

Indicates when filter needs maintenance.

11 Room temperature

5

(See the Installation Manual.)

Current room temperature appears here.

12

Appears when the buttons are locked.

13

Appears when the On/Off timer or Night setback
function is enabled.

14

Appears when the Weekly timer is enabled.

15

Appears while the units are operated in the
energy-save mode.

16

Appears while the outdoor units are operated in
the silent mode.

17

Appears when the built-in thermistor on the
remote controller is activated to monitor the
room temperature (a).

appears when the thermistor on the
indoor unit is activated to monitor the room
temperature.

18

Indicates the vane setting.

19

Indicates the louver setting.

20

Indicates the ventilation setting.

21

Appears when the preset temperature range is
restricted.

Controller interface

*

1234

Function buttons

10987

• When the backlight is off, pressing any button turns the backlight on and

does not perform its function. (except for the ON/OFF button)

• Most settings (except ON/OFF, mode, fan speed, temperature) can be

made from the Menu screen.

1 ON/OFF button

Press to turn ON/OFF the indoor unit.

2 SELECT button

Press to save the setting.

3 RETURN button

5

Press to return to the previous screen.

4 MENU button

Press to bring up the Main menu.

6

5 Backlit LCD

Operation settings will appear.
When the backlight is off, pressing any
button turns the backlight on and it
will stay lit for a certain period of time
depending on the screen.

6 ON/OFF lamp

This lamp lights up in green while the unit
is in operation. It blinks while the remote
controller is starting up or when there is
an error.

The functions of the function buttons
change depending on the screen. Refer
to the button function guide that appears
at the bottom of the LCD for the functions
they serve on a given screen.
When the system is centrally controlled,
the button function guide that
corresponds to the locked button will not
appear.

Main display Main menu

Room

Set temp.

Cool Auto

Mode Temp. Fan

7 8 9 0 7 8 9 0

Function guide

Main

Fri

Main menu

Vane·Louver·Vent. (Lossnay)
High power
Timer
Weekly timer
OU silent mode

Main display:

Cursor Page

7 Function button F1

Main display: Press to change the operation
mode.
Main menu: Press to move the cursor down.

8 Function button F2

Main

display
Main menu: Press to move the cursor up.

: Press to decrease temperature.

9 Function button F3

Main

display

Main menu: Press to go to the previous page.

: Press to increase temperature.

10 Function button F4

Main

display

Main menu: Press to go to the next page.

: Press to change the fan speed.

4 5

Main menu list

OCH564

Setting and display items Setting details

Vane · Louver · Vent.

(Lossnay)

High power Use to reach the comfortable room temperature quickly.

Timer On/Off timer* Use to set the operation On/Off times.

Auto-Off timer Use to set the Auto-Off time.

Filter information Use to check the lter status.

Error information Use to check error information when an error occurs.

Weekly timer* Use to set the weekly operation On / Off times.

Energy saving Auto return Use to get the units to operate at the preset temperature after performing energy-save operation for a specied

Schedule* Set the start/stop times to operate the units in the energy-save mode for each day of the week, and set the

Night setback* Use to make Night setback settings.

Restriction Temp. range Use to restrict the preset temperature range.

Operation lock Use to lock selected functions.

Maintenance Auto descending panel Auto descending panel (Optional parts) Up / Down you can do.

Manual vane angle Use to set the vane angle for each vane to a xed position.

Initial setting Main/Sub When connecting two remote controllers, one of them needs to be designated as a sub controller.

Clock Use to set the current time.

Main display Use to switch between "Full" and "Basic" modes for the Main display.

Contrast Use to adjust screen contrast.

Initial setting Display details Make the settings for the remote controller related items as necessary.

Auto mode Whether or not to use the AUTO mode can be selected by using the button.

Administrator

word

Language selection Use to select the desired language.

Service Test run Select "Test run" from the Service menu to bring up the Test run menu.

Input maintenance Select "Input maintenance Info." from the Service menu to bring up the Maintenance information screen.

Function setting Make the settings for the indoor unit functions via the remote controller as necessary.
LOSSNAY setting
(City Multi only)

Check Error history: Display the error history and execute "delete error history".

Self check Error history of each unit can be checked via the remote controller.

Maintenance password Take the following steps to change the maintenance password.

Remote controller
check

* Clock setting is required.

pass-

Use to set the vane angle.

• Select a desired vane setting from ve different settings.

Use to turn ON / OFF the louver.

• Select a desired setting from "ON" and "OFF."

Use to set the amount of ventilation.

• Select a desired setting from "Off," "Low," and "High."

• Units can be operated in the High-power mode for up to 30 minutes.

• Time can be set in 5-minute increments.

• Time can be set to a value from 30 to 240 in 10-minute increments.

• The lter sign can be reset.

• Check code, error source, refrigerant address, unit model, manufacturing number, contact information (dealer's phone
number) can be displayed.

(The unit model, manufacturing number, and contact information need to be registered in advance to be displayed.)

• Up to eight operation patterns can be set for each day.

(Not valid when the On/Off timer is enabled.)

time period.

• Time can be set to a value from 30 and 120 in 10-minute increments.

(This function will not be valid when the preset temperature ranges are restricted.)

energy-saving rate.

• Up to four energy-save operation patterns can be set for each day.

• Time can be set in 5-minute increments.

• Energy-saving rate can be set to a value from 0% and 50 to 90% in 10% increments.

Select "Yes" to enable the setting, and "No" to disable the setting. The temperature range and the start/stop times can be set.

•

• Different temperature ranges can be set for different operation modes.

• The locked functions cannot be operated.

• The initial setting is "Full."

Clock: The initial settings are "Yes" and "24h" format.
Temperature: Set either Celsius (°C) or Fahrenheit (°F).
Room temp. : Set Show or Hide.
Auto mode: Set the Auto mode display or Only Auto display.

This setting is valid only when indoor units with the AUTO mode function are connected.

The administrator password is required to make the settings for the following items.

• Timer setting • Energy-save setting • Weekly timer setting

• Restriction setting • Outdoor unit silent mode setting • Night set back

• Test run • Drain pump test run

The following settings can be made from the Maintenance Information screen.

• Model name input • Serial No. input • Dealer information input

This setting is required only when the operation of City Multi units is interlocked with LOSSNAY units.

Refrigerant leak check: Refrigerant leaks can be judged.

Smooth maintenance: The indoor and outdoor maintenance data can be displayed.
Request cord: Details of the operation data including each thermistor temperature and error history can be checked.

When the remote controller does not work properly, use the remote controller checking function to trouble­shoot the problem.

5

3

OCH564

SPECIFICATIONS

Indoor service ref.

Mode

Power supply (phase, cycle, voltage)

Input
Running current*
Dew prevention heater
Power factor*

Electrical

data

Fan motor output*

Airflow (Low/Midium/High)

K/h

Noise level (Low/Midium/High)

Width

snoisnemiD

Depth
Height

Weight

NOTE : Test conditions are based on ISO 5151.
Cooling : Indoor D.B. 27˚C W.B. 19˚C
Outdoor D.B. 35˚C W.B. 24˚C
Heating : Indoor D.B. 20˚C W.B. 15˚C
Outdoor D.B. 7˚C W.B. 6˚C
Refrigerant piping length (one way): 5m
*Measured under rated operating frequency

mm (in)
mm (in)
mm (in)

kW

A
W
%

kW

dB

kg

SLZ-KA25VAL3.TH(-ER)

Cooling Heating

Single phase
50 Hz, 230 V

0.05 0.03

0.37 0.26

0.014

59 51

0.05

480/540/660

29/33/38

SLZ-KA35VAL3.TH(-ER)

Cooling

Heating

Single phase
50 Hz, 230 V

0.05 0.03

0.37 0.26

0.014

59 51

0.05

480/540/660

29/33/38

UNIT: 570 (22-7/16) PANEL: 650 (25-9/16)
UNIT: 570 (22-7/16) PANEL: 650 (25-9/16)
UNIT: 235 (9-1/4) PANEL: 20 (13-13/16)
UNIT: 16 PANEL: 3

SLZ-KA50VAL3.TH(-ER)

Cooling

Heating

Single phase
50 Hz, 230 V

0.05 0.03

0.37 0.26

0.014

59 51

0.05

480/540/660

30/34/39

Specifications and rating conditions of main electric parts

INDOOR UNIT

Item

Fuse

Vane motor

Terminal block

Cord Heater

Service ref.

(FUSE)

(MV)

(TB)

(H2)

SLZ-KA25VAL3.TH(-ER)

TO OUTDOOR UNIT: 3P TO WIRED REMOTE CONTROLLER: 2P

SLZ-KA35VAL3.TH(-ER)

250V 6.3A

MSBPC20 12V 250"

240V AC 15W

SLZ-KA50VAL3.TH(-ER)

NOISE CRITERION CURVES

OCH564

SLZ-KA25VAL3.TH(-ER)
SLZ-KA35VAL3.TH(-ER)

NOTCH

High

Medium

Low

90

80

70

60

50

40

30

APPROXIMATE

20

THRESHOLD OF

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)

HEARING FOR
CONTINUOUS
NOISE

10

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

<50Hz>

SPL(dB)33LINE

38

29

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

SLZ-KA50VAL3.TH(-ER)

NOTCH

High

Medium

Low

90

80

70

60

50

40

30

APPROXIMATE

20

THRESHOLD OF

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)

HEARING FOR
CONTINUOUS
NOISE

10

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

<50Hz>

SPL(dB)34LINE

39

30

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

UNIT

CEILING

1.5m

MICROPHONE

NOTE: The sound level is measured in an anechoic room where echoes are few, when compressor stops. The sound

may be bigger than the indicated level in actual use due to surrounding echoes. The sound level can be higher
by about 2 dB than the indicated level during cooling and heating operation.

77

4

OCH564

OUTLINES AND DIMENSIONS

SLZ-KA25VAL3.TH
SLZ-KA35VAL3.TH
SLZ-KA50VAL3.TH
SLZ-KA25VAL3.TH-ER
SLZ-KA35VAL3.TH-ER
SLZ-KA50VAL3.TH-ER

570

335

Unit: mm

Refrigerent pipe

(gas)

flared connection

{ 9.52mm

Refrigerent pipe

(liquid)

flared connection

{ 6.35mm

Models

18248

Wiring entry

Suspension bolt

M10 or 3/8

(procure locally)

87

31

Drain pipe

VP-25 connection

(O.D. { 32)

235

208

193

20

0

Brand label

27

+5

Grille

Auto vane

Drain hole

SLZ-KA25VAL3

377

3/8 inch

flared connection

{ 9.52mm

1/4 inch

flared connection

{ 6.35mm

SLZ-KA35VAL3

Air intake hole

3/8 inch

{ 12.7mm

1/4 inch

{ 6.35mm

1/2 inch

flared connection

1/4 inch

flared connection

SLZ-KA50VAL3

Vane motor

Air intake grille

Fresh air

intake

530

Suspension bolt

pitch

Ceiling hole

{ 73.4

Cut out hole

570

Suspension bolt pitch

420

120

V/M

Ceiling surface

15~37 15~37576~620

352

335

Ceiling hole

576~620

15~37 15~37

230

17 202

66121

Refrigerent pipe (liquid)

Refrigerent pipe (gas)

199

56
57

Grille

301

650

Terminal block

Air outlet hole

Terminal block

(Case of Wired remote controller)

lower edge
Suspension bolt

93

38~58

V/M

55 35

Air outlet hole

301

650

Receiver

V/M

V/M

377

Air intake hole

35 55

25

{ 100

3- { 2.8 hole

Detail drawing of fresh air intake

Burring hole

Operation lamp

118

120

Ceiling surface

(WIRELESS PANEL)

DEFROST/STAND BY lamp

Emergency operation switch(cooling)

Emergency operation switch(heating)

WIRELESS REMOTE CONTROLLER

OCH564

57 17.5

Unit: mm

h

B

D

C

A

140

ON/OFF

AUTO COOL

HEAT

MODE

DRY

TOO

WARM

FAN

VANE

TOO

COOL

SELECT

TIME

RESET

Installation area

• Area in which the remote controller is not exposed to direct sunlight

• Area in which there is no heating source nearby

• Area in which the remote controller is not exposed to cold (or hot) winds

• Area in which the remote controller can be operated easily

• Area in which the remote controller is beyond the reach of children

Installation method

1 Attach the remote controller holder to the desired location using 2 tapping screws.
2 Insert the lower end of the controller into the holder.
A Wireless remote controller (Accessory)
B Wall
C Remote controller holder (Accessory)

D Fixing screw (Accessory)

• The signal can travel up to approximately 7 meters (in a straight line) within 45
degrees to both right and left of the center line of the receiver.
In addition, the signal may not be received if there is interference of light of fluorescent
lights or strong sunlight.

99

WIRED REMOTE CONTROLLER PAR-31MAA

OCH564

(Option)

Unit: mm

19120

120

46

83.5

5

OCH564

WIRING DIAGRAM

SLZ-KA25VAL3.TH SLZ-KA35VAL3.TH SLZ-KA50VAL3.TH
SLZ-KA25VAL3.TH-ER SLZ-KA35VAL3.TH-ER SLZ-KA50VAL3.TH-ER

MS

MF

ON
OFF

LED3

6 1

BRN

3 ~

LED2

GRN

(VANE)

CN6V

RED

YLW

ORN

WHT

5

BLU

YLW

WHT

BLK

6 5 4

7 1

LED1

WHT

(DRAIN)

CN31

3 1

BLU

t°

DS

RED

WHT
(FAN)
CNMF

~

+

~

RED

CN105

5 1

−

BLU

(CONTROL)

CN3C

(D·U·M)

X1

F1

YLW

ORN

3 1

BLU

3 1

CNP

RED

(D-HEATER)

CNC

3

(POWER)

CN01

15

BLK

BLK

TB4

BRN

ORN

YLW
YLW

YLW

YL

1

S3

S2

S1

W

W.B

RU

BZ

LED1

LED2

SW1

SW2

CNB

MV

M

M

M

M

GRILLE

W.R

5

5

5

5

20

H2

REMOTE
CONTROLLER

SKY BLU

PINK

GRY

VLT

BLU

YLW

9

ORN

RED
BRN

RED

ORN

YLW

WHT

BLU

YLW
YLW

I.B

See fig.*1

SW2 SW3

ON
OFF

1 2 3 45 1 2 3 4 5

OFF ON

WHT

WHT

CN32

RED

CN2L

WHT

(LIQUID)

CN21

RED

(INTAKE)

CN20

BLK

(2 PHASE)

CN29

CN51

5 1

3 1

2 1

TH22

t°

2 1

TH21

9
8
7
6
5

4

3
2
1

7
6
3
2
1

10

5

TH23

t°

2 1

t°

2 1

SWE

WHT
CN41

4 1

WHT

(WIRELESS)

CN90

9 1

VLT

BLU

YLW

GRY

PINK

SKY BLU

RED

ORN

9

TO
OUTDOOR
UNIT

2

M

DP

1 ~

1

2

[LEGEND]

SYMBOL NAME SYMBOL NAME

I.B

INDOOR CONTROLLER BOARD

CN2L

CONNECTOR (LOSSNAY)

CN32

CONNECTOR (REMOTE SWITCH)
CONNECTOR (HA TERMINAL-A)

CN41

CN51

CONNECTOR (CENTRALLY CONTROL)

CN105

CONNECTOR (IT)

F1

FUSE (T6.3AL250V)

LED1

POWER SUPPLY (I.B)

LED2

POWER SUPPLY

(WIRED REMOTE CONTROLLER)

LED3

TRANSMISSION (INDOOR-OUTDOOR)

SW2

SWITCH (CAPACITY MODE)

SW3

SWITCH (MODE SELECTION)
SWITCH (EMERGENCY OPERATION)

SWE

W.B

X1

BZ
LED1
LED2
SW1
SW2
RU

(DRAIN PUMP/DEW

RELAY
PREVENTION HEATER)
WIRELESS REMOTE
CONTROLLER BOARD
BUZZER
LED (RUN INDICATOR)
LED (HOT ADJUST)
SWITCH (HEATING ON/OFF)
SWITCH (COOLING ON/OFF)
RECEIVING UNIT

W.R

WIRELESS REMOTE CONTROLLER

DP

DRAIN PUMP
DRAIN SENSOR

DS

DEW PREVENTION HEATER

H2

FAN MOTOR

MF

VANE MOTOR

MV

TB4

TERMINAL BLOCK
CONNECTING LINE)

TB5

TERMINAL BLOCK (REMOTE
CONTROLLER TRANSMISSION LINE)

TH21

ROOM TEMP. THERMISTOR
(0°C / 15kΩ, 25°C / 5.4kΩ DETECT)

TH22

PIPE TEMP. THERMISTOR

(0°C / 15kΩ, 25°C / 5.4kΩ DETECT)

TH23

COND. / EVA. TEMP. THERMISTOR

(0°C/ 15kΩ, 25°C / 5.4kΩ DETECT)

OPTION PART

WIRED REMOTE CONTROLLER BOARD

R.B

TERMINAL BLOCK (REMOTE

TB6

CONTROLLER TRANSMISSION LINE)

(INDOOR/OUTDOOR

*For details on how to operate self-diagnosis refer to the technical manuals etc.

NOTES:

1. Since the outdoor side electric wiring may change be sure to check the
outdoor unit electric wiring for servicing.

2. Indoor and outdoor connecting wires are made with poIarities, make wiring
matching terminal numbers (S1, S2, S3).

3. SymboIs used in wiring diagram above are, :Connector, :Terminal
(block).

<fig.*1>

MODELS SW2

KA25

KA35

KA50

The black square (■) indicates

a switch position. <*1>

1 2 3 45

1 2 3 45

1 2 3 45

ON
OFF

ON
OFF

ON
OFF

1111

6

OCH564

REFRIGERANT SYSTEM DIAGRAM

SLZ-KA25VAL3.TH SLZ-KA35VAL3.TH SLZ-KA50VAL3.TH
SLZ-KA25VAL3.TH-ER SLZ-KA35VAL3.TH-ER SLZ-KA50VAL3.TH-ER

Strainer

Heat exchanger

Room temperature
thermistor (TH21)

Distributor
with strainer
#50

Condenser/evaporator
temperature thermistor
(TH23)

Pipe temperature
thermistor/liquid
(TH22)

#50

Refrigerant GAS pipe connection
(Flare)

Refrigerant LIQUID pipe connection
(Flare)

Strainer
#50

Refrigerant flow in cooling
Refrigerant flow in heating

12 13

7

OCH564

TROUBLESHOOTING

7-1. CAUTIONS ON TROUBLESHOOTING

(1) Before troubleshooting, check the followings:

Check the power supply voltage.

Check that the indoor/outdoor connecting wire is correct.

(2) Take care of the followings during servicing.

Before servicing the air conditioner, be sure to turn off the remote controller first to stop the main unit, and then turn
off the breaker.
When removing the indoor controller board, hold the edge of the board with care NOT to apply stress on the
components.
When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.

Lead wire

7-2. SELF-CHECK

Wireless remote controller

56

24

ON/OFF

AUTO COOL

DRY

HEAT

MODE

TOO

WARM

FAN

VANE

h

TOO
COOL

SELECT

TIME

RESET

24

23

7-2-1. WIRED REMOTE CONTROLLER

For details, refer to the installation manual that comes with each remote controller.

7-2-2. WIRELESS REMOTE CONTROLLER

1 Turn ON the power.
2 While pressing both the MODE SELECT button and

TOO COOL button on the remote controller at the same
time, press the RESET button.

3 Firstly, release the RESET button.
4 And release the other 2 buttons since all LCD in

operation display section of the remote controller is
displayed after 3 seconds.
5 Transmit the signal of remote controller, pressing ON/ OFF
button on the remote controller.
(The above procedure allows OPERATION INDICATOR lamp
to indicate the failure-mode.)
6 Transmit the signal of remote controller, pressing a button other
than ON/ OFF button or VANE button to stop the self-check.

OPERATION INDICATER

13

[Output pattern A] Errors detected by indoor unit

[Output pattern B]

E9

1. If the beeper does not sound again after the initial

2 beeps to confirm the self-check start signal was received and

the OPERATION INDICATOR lamp does not come on,

there are no error records.

2. If the beeper sounds 3 times continuously “beep, beep, beep (0.4 + 0.4 + 0.4 sec.)” after the initial 2 beeps to confirm
the self-check start signal was received, the specified refrigerant address is incorrect.

OPERATION
INDICATOR
lamp blink
pattern

Beep Beep Beep Beep Beep

Beep Beep

Off

Approx. 2.5 sec.OnApprox. 3 sec.On0.5 sec.On0.5 sec.On0.5 sec.On0.5 sec.

Off

Approx. 2.5 sec.OnApprox. 3 sec.On0.5 sec.On0.5 sec.

··· Repeated

Number of blinks/beeps in pattern indicates the check
code in the following table (i.e., n=5 for “U2”)

Number of blinks/beeps in pattern indicates
the check code in the following table

n

th

1st2nd3

rd

1st2

nd

Self-check
starts
(Start signal
received)

Beeper sounds

[Output pattern B]

OPERATION
INDICATOR
lamp blink
pattern

Beep

Beep Beep Beep Beep Beep Beep

Off

Approx. 2.5 sec.On0.5 sec.On0.5 sec.On0.5 sec.

On

0.5 sec.

Off

Approx. 2.5 sec.On0.5 sec.On0.5 sec.

··· Repeated

Number of blinks/beeps in pattern indicates the check
code in the following table (i.e., n=5 for “P5”)

Number of blinks/beeps in pattern indicates
the check code in the following table

n

th

1st2nd3

rd

1st2

nd

Self-check
starts
(Start signal
received)

Beeper sounds

• Refer to the following tables for details on the check codes.
[Output pattern A]

Notes:

Beeper sounds/OPERATION

INDICATOR lamp blinks 1 Check code

Symptom Remarks

(Number of times)

Wireless remote controller

Wired remote controller

Beeper sounds/OPERATION

INDICATOR lamp blinks 1 Check code

(Number of times)

Wireless remote controller

Wired remote controller

1 P1

Intake sensor error

P9 Pipe (TH23) sensor error

2

P2 Pipe (TH22) sensor error

3 E6,E7

Indoor/outdoor unit communication error

4 P4 Drain sensor error
5 P5 Drain pump error
6 P6 Freezing/Overheating protection operation
7 EE Communication error between indoor and outdoor units
8 P8 Pipe temperature error
9 E4, E5 Remote controller signal receiving error

10

–

11

–

–

–

Errors detected by unit other than indoor unit (outdoor unit, etc.)

Symptom Remarks

1

Indoor/outdoor unit communication error

2

(Transmitting error) (Outdoor unit)

3

Open/short of outdoor unit thermistors

4

Compressor overcurrent interruption (When compressor locked)

5

Abnormal high discharging temperature/49C operated/
insufficient refrigerant

6

Abnormal high pressure (63H operated)/Overheating
protection operation

7

Abnormal temperature of heatsink

8

Outdoor unit fan protection stop

9

Compressor overcurrent interruption/Abnormal of power module

10

Abnormality of superheat due to low discharge temperature

11

Abnormality such as overvoltage or voltage shortage and
abnormal synchronous signal to main circuit/Current sensor error

12

13

U2

U5

UP
U3,U4
UF

U1,Ud

U8
U6
U7

U9,UH

Others

–
–

–
–

14

Other errors (Refer to the technical manual for the outdoor unit.)

For details, check
the LED display
of the outdoor
controller board.
As for outdoor
unit, refer to
outdoor unit’s
service manual.

12 Fb Indoor unit control system error (memory error, etc.)
14 PL Refrigerant circuit abnomal

–

E0, E3

– E1, E2 Remote controller control board error

Remote controller transmission error

Compressor overcurrent interruption

OCH564

14 15

continued to the next page.

•

If the unit cannot be operated properly after the test run, refer to the following table to find out the cause.

Symptom

Cause

Wired remote controller

On the wireless remote controller with condition above, following phenomena take place.

• No signals from the remote controller can be received.

• Operation lamp is blinking.

• The buzzer makes a short ping sound.

PLEASE WAIT

PLEASE WAIT → check code

No messages appear even
when operation switch is turned
ON (operation lamp does not
light up).

For about 2 minutes after power-on

Subsequent to about 2 minutes
after power-on

•

For about 2 minutes after power-on,operation

of the
remote controller is not possible due to system start-up.
(Correct operation)

•Connector for the outdoor unit’s protection device is not

connected.

•Reverse or open phase wiring for the outdoor unit’s

power terminal block

•Incorrect wiring between indoor and outdoor units.

(incorrect polarity of S1, S2, S3)

•Remote controller wire short

Note:
Operation is not possible for about 30 seconds after cancellation of function selection. (Correct operation)

For description of each LED (LED1, 2, 3) provided on the indoor controller, refer to the following table.

LED1 (power for microprocessor)

Indicates whether control power is supplied. Make sure that this LED is
always lit.

LED2 (power for remote controller)

Indicates whether power is supplied to the remote controller.
This LED lights only in the case of the indoor unit which is connected to the
outdoor unit refrigerant address “0”.

LED3 (communication between indoor and
outdoor units)

Indicates state of communication between the indoor and outdoor units.
Make sure that this LED is always blinking.

• On wireless remote controller

1 The continuous buzzer sounds from receiving section of indoor unit.
2 Blink of operation lamp

• On wired remote controller

1 Check code displayed on the LCD.

OCH564

15

7-3. SELF-DIAGNOSIS ACTION TABLE

OCH564

Check code

P1

P2

Abnormal point and detection method

Room temperature thermistor (TH21)

1The unit is in 3-minute resume prevention

mode if short/open of

thermistor is detected. Abnormal if the

unit does not reset normally after 3
minutes. (The unit returns to normal
operation, if it has been reset normally.)

2 Constantly detected during cooling,

drying and heating operation
Short: -90˚C or more
Open: -40˚C or less

Pipe temperature thermistor/Liquid
(TH22)

1 The unit is in 3-minute resume

prevention mode if short/open of
thermistor is detected. Abnormal if the

unit does not reset normally after 3

minutes. (The unit returns to normal

operation, if it has been reset normally.)
2 Constantly detected during cooling,

drying, and heating (except defrosting)

operation.
Short: 90˚C or more
Open: -40˚C or less

Note: Errors to be detected in outdoor unit, such as codes starting

with F, U or E (excluding E0 to E7), are not covered in this
document. Please refer to the outdoor unit's service manual
for the details.

Cause

1 Defective thermistor

characteristics

2 Contact failure of connector

(CN20) on the indoor controller
board (Insert failure)

Breaking of wire or contact

failure of thermistor wiring

Defective indoor controller

board

1 Defective thermistor

characteristics

2 Contact failure of connector

(CN21) on the indoor controller
board (Insert failure)

Breaking of wire or contact

failure of thermistor wiring

Defective refrigerant circuit is

causing thermistor temperature
of 90˚C or more or -40˚C or
less.

Defective indoor controller board

Countermeasure

1~

Check resistance value of thermistor.

.....

0˚C

15.0 kΩ

.......

10˚C

20˚C
30˚C
40˚C

If you put force on (draw or bend) the lead wire
with measuring resistance value of thermistor,
breaking of wire or contact failure can be detected.
2 Check contact failure of connector (CN20)

on the indoor controller board. Refer to "7-5.
TEST POINT DIAGRAM". Turn the power
back on and check restart after inserting
connector again.

Check room temperature display on remote

controller.

Replace indoor controller board if there

is abnormal difference with actual room
temperature.

Turn the power off, and on again to operate
after checking.

~ Check resistance value of thermistor.

For characteristics, refer to (P1) above.
2 Check contact failure of connector (CN21)

on the indoor controller board. Refer to "7-5.
TEST POINT DIAGRAM". Turn the power on
and check restart after inserting connector
again.

Check pipe <liquid> temperature with remote

controller in test run mode. If pipe <liquid>
temperature is extremely low (in cooling
mode) or high (in heating mode), refrigerant
circuit may have defect.

Check pipe <liquid> temperature with

remote controller in test run mode. If there is
extreme difference with actual pipe <liquid>

temperature, replace indoor controller board.
Turn the power off, and on again to operate
after checking.

.......

.......

.......

9.6 kΩ

6.3 kΩ

4.3 kΩ

3.0 kΩ

P4

P5

Drain sensor (DS)

1 Suspensive abnormality, if short/open

of thermistor is detected for 30 seconds
continuously.

Turn off compressor and indoor fan.
2 Short/open is detected for 30 seconds

continuously during suspensive

abnormality.
(The unit returns to normal operation,
if it has been reset normally.)

Detect the following condition.

• During cooling and drying operation

• In case that pipe <liquid> temperature ­room temperature <-10deg

(Except defrosting)

• When pipe <liquid> temperature
or room temperature is short/open
temperature.

• During drain pump operation

Malfunction of drain pump (DP)

1 Suspensive abnormality, if thermistor of

drain sensor heats itself and temperature
rises slightly. Turn off compressor and
indoor fan.

2Drain pump is abnormal if the condition

above is detected during suspensive
abnormality.

Constantly detected during drain pump

operation

1 Defective thermistor

characteristics

2 Contact failure of connector

(CN31) on the indoor controller
board (Insert failure)

Breaking of wire or contact

failure of drain sensor wiring

Defective indoor controller board

1 Malfunction of drain pump
2 Defective drain

Clogged drain pump
Clogged drain pipe

Attached drop of water at the

drain sensor

• Drops of drain trickles from
lead wire

• Clogged filter is causing
wave of drain.

Defective indoor controller board

1~3 Check resistance value of thermistor.

2 Check contact failure of connector (CN31)

on the indoor controller board. Refer to "7-5.
TEST POINT DIAGRAM". Turn the power
back on and check restart after inserting
connector again.

4 Replace indoor controller board if drain

pump operates with the line of drain sensor
connector CN31-1 and 2 is short-circuited,
and abnormality reappears.

Turn the power off, and on again to operate
after checking.

1 Check if drain pump operates.
2 Check drain function.
3 Check the setting of lead wire of drain

sensor and check clogs of the filter.

4 Replace indoor controller board if drain

pump operates with the line of drain sensor
connector CN31-1 and 2 is short-circuited
and abnormality reappears.

Refer to "7-5. TEST POINT DIAGRAM".

Turn the power off, and on again to operate
after checking.

0˚C
10˚C

20˚C
30˚C
40˚C

.......

.......

.......

.......

.......

6.0 kΩ

3.9 kΩ

2.6 kΩ

1.8 kΩ

1.3 kΩ

16 17

Check code

OCH564

P6

Abnormal point and detection method

Freezing/overheating protection is
operating

Freezing protection (Cooling mode)

The unit is in 6-minute resume prevention
mode if pipe <liquid or condenser/
evaporator> temperature stays under

-15˚C for 3 minutes after the compressor
started. Abnormal if it stays under -15˚C
for 3 minutes again within 16 minutes
after 6-minute resume prevention mode.

Overheating protection (Heating mode)

The units is in 6-minute resume
prevention mode if pipe <condenser /
evaporator> temperature is detected as
over 70˚C after the compressor started.
Abnormal if the temperature of over
70˚C is detected again within 10 minutes
after 6-minute resume prevention mode.

Cause

(Cooling or drying mode)
1 Clogged filter (reduced airflow)

Short cycle of air path
Low-load (low temperature)

operation out of the tolerance
range

Defective indoor fan motor

• Fan motor is defective.

• Indoor controller board is
defective.

Defective outdoor fan control
Overcharge of refrigerant
Defective refrigerant circuit

(clogging)

(Heating mode)
1 Clogged filter (reduced airflow)

Short cycle of air path
Overload (high temperature)

operation out of the tolerance
range

Defective indoor fan motor

• Fan motor is defective.

• Indoor controller board is
defective.

Defective outdoor fan control
Overcharge of refrigerant
Defective refrigerant circuit

(clogging)

Bypass circuit of outdoor unit is

defective.

Countermeasure

(Cooling or drying mode)
1 Check clogging of the filter.

Remove blockage.

Refer to "7-7-2. DC FAN MOTOR (FAN

MOTOR/ INDOOR CONTROLLER BOARD)".

Check outdoor fan motor. Refer to "7-5.

TEST POINT DIAGRAM".

Check operating condition of refrigerant 　
circuit.

(Heating mode)
1 Check clogs of the filter.

Remove blockage.

Refer to "7-7-2. DC FAN MOTOR (FAN

4

MOTOR/ INDOOR CONTROLLER BOARD)".

Check outdoor fan motor.
~ Check operating condition of refrigerant

circuit.

P8

Pipe temperature

<Cooling mode>
Detected as abnormal when the pipe tem­perature is not in the cooling range 3 min­utes after compressor start and 6 minutes
after the liquid or condenser/evaporator pipe
is out of cooling range.
Note 1) It takes at least 9 minutes to

detect.

Note 2) Abnormality P8 is not detected in

drying mode.

Cooling range: -3 deg (TH-TH21)
TH: Lower temperature between liquid pipe

temperature (TH22) and condenser/
evaporator temperature (TH23)

TH21: Intake temperature

<Heating mode>
When 10 seconds have passed after the
compressor starts operation and the hot
adjustment mode has finished, the unit is
detected as abnormal when condenser/
evaporator pipe temperature is not in heat­ing range within 20 minutes.

Note 3) It takes at least 27 minutes to

detect abnormality.

Note 4) It excludes the period of defrosting

(Detection restarts when defrosting
mode is over)

Heating range: 3 deg (TH23-TH21)

1 Slight temperature difference

between indoor room
temperature and pipe <liquid
or condenser / evaporator>
temperature thermistor

• Shortage of refrigerant

• Disconnected holder of
pipe <liquid or condenser /
evaporator> thermistor

• Defective refrigerant circuit

Converse connection of

extension pipe (on plural units
connection)

Converse wiring of indoor/

outdoor unit connecting wire
(on plural units connection)

Defective detection of indoor

room temperature and pipe
<condenser / evaporator>
temperature thermistor

Stop valve is not opened

completely.

Check pipe <liquid or condenser /

1~

evaporator> temperature with room
temperature display on remote controller
and outdoor controller circuit board.

Pipe <liquid or condenser / evaporator>

temperature display is indicated by setting

SW2 of outdoor controller circuit board as

follows.

Conduct temperature check with outdoor
controller circuit board after connecting

(

‘A-Control Service Tool (PAC-SK52ST)’.

Check converse connection of extension
pipe or converse wiring of indoor/outdoor
unit connecting wire.

)

17

Check code

OCH564

P9

PL

Abnormal point and detection method

Pipe temperature thermistor / Condenser
/ Evaporator (TH23)

1 The unit is in 3-minute resume protec-

tion mode if short/open of thermistor is
detected. Abnormal if the unit does not
get back to normal within 3 minutes. (The
unit returns to normal operation, if it has
been reset normally.)

2 Constantly detected during cooling,

drying, and heating operation (except

defrosting)
Short: 90°C or more
Open: -40°C or less

Abnormal refrigerant circuit

During Cooling, Dry, or Auto Cooling

operation, the following conditions are
regarded as failures when detected for
one second.

a) The compressor continues to run for 30

or more seconds.

b) The liquid pipe temperature or the

condense/evaporator temperature is
75°C or more.

These detected errors will not be
cancelled until the power source is

reset.

Cause

1 Defective thermistor

characteristics

2 Contact failure of connector

(CN29) on the indoor controller
board (Insert failure)

Breaking of wire or contact

failure of thermistor wiring

Temperature of thermistor is

90°C or more or -40°C or less
caused by defective refrigerant
circuit.

Defective indoor controller

board

1 Abnormal operation of 4-way

valve

2 Disconnection of or leakage in

refrigerant pipes
Air into refrigerant piping
Abnormal operation (no

rotation) of indoor fan

· Defective fan motor.

· Defective indoor control board.

Defective refrigerant circuit

(clogging)

Countermeasure

Check resistance value of thermistor.

1~

For characteristics, refer to (P1) above.
2 Check contact failure of connector (CN29)

on the indoor controller board.
Refer "7-5. TEST POINT DIAGRAM".
Turn the power on and check restart after

inserting connector again.

Operate in test run mode and check pipe

<condenser/evaporator> temperature with

outdoor controller circuit board. If pipe

<condenser/evaporator> temperature is

extremely low (in cooling mode) or high (in

heating mode), refrigerant circuit may have

defect.

Operate in test run mode and check pipe

<condenser/evaporator> temperature

with outdoor control circuit board. If there

is extreme difference with actual pipe

<condenser/evaporator> temperature replace

indoor controller board.
There is no abnormality if none of the above

comes within the unit.
Turn the power off and on again to operate.

In case of checking pipe temperature
with outdoor controller circuit board,
be sure to connect A-control service

(

tool (PAC-SK52ST).

1 When this error occurs, be sure to

replace the 4-way valve.

2 Check refrigerant pipes for disconnection or

leakage.

3 After the recovery of refrigerant, vacuum

dry the whole refrigerant circuit.

4 Refer to section "7-7. TROUBLE

CRITERION OF MAIN PARTS".

5 Check refrigerant circuit for operation.

To avoid entry of moisture or air into

refrigerant circuit which could cause
abnormal high pressure, purge air in
refrigerant circuit or replace refrigerant.

)

E0

or

E4

Remote controller transmission

error(E0)/signal receiving error(E4)

1 Abnormal if main or sub remote con-

troller cannot receive any transmission
normally from indoor unit of refrigerant
address “0” for 3 minutes.

(Check code : E0)
2 Abnormal if sub-remote controller could

not receive for any signal for 2 minutes.
(Check code: E0)

1 Abnormal if indoor controller board

cannot receive normally any data from
remote controller board or from other
indoor controller board for 3 minutes.
(Check code: E4)

2 Indoor controller board cannot receive

any signal from remote controller for 2
minutes. (Check code: E4)

1 Contact failure at transmission

wire of remote controller

2 All remote controllers are set

as “sub” remote controller. In
this case, E0 is displayed on
remote controller, and E4 is
displayed at LED (LED1, LED2)
on the outdoor controller circuit

board.
Miswiring of remote controller
Defective transmitting/receiving

circuit of remote controller
Defective transmitting/receiving

circuit of indoor controller board

of refrigerant address “0”
Noise has entered into the

transmission wire of remote

controller.

18 19

1 Check disconnection or looseness of indoor

unit or transmission wire of remote controller.

2 Set one of the remote controllers “main”, if

there is no problem with the action above.

3 Check wiring of remote controller.

• Total wiring length: max. 500 m
(Do not use cable × 3 or more)

• The number of connecting indoor units:
max. 16 units

• The number of connecting remote
controller: max. 2 units

When the above-mentioned problem of
1~3are not seen.

Diagnose remote controllers.

a) When “RC OK” is displayed, remote

controllers have no problem.
Turn the power off, and on again to check.
If abnormality generates again, replace
indoor controller board.

b) When “RC NG” is displayed, replace

remote controller.

c)

When “RC E3” or “ERC 00-66” is displayed,
noise may be causing abnormality.

Check code

OCH564

E3

or

E5

E6

Abnormal point and detection method

Remote controller transmission

error(E3)/signal receiving error(E5)

1 Abnormal if remote controller could not

find blank of transmission path for 6
seconds and could not transmit.

(Check code: E3)
2 Remote controller receives transmitted

data at the same time, compares the
data, and when detecting it, judges
different data to be abnormal 30
continuous times. (Check code: E3)

1 Abnormal if indoor controller board could

not find blank of transmission path.

(Check code: E5)
2 Indoor controller board receives

transmitted data at the same time,
compares the data, and when detecting
it, judges different data to be abnormal
30 continuous times. (Check code: E5)

Indoor/outdoor unit communication

error (Signal receiving error)

1 Abnormal if indoor controller board

cannot receive any signal normally for 6
minutes after turning the power on.

2 Abnormal if indoor controller board

cannot receive any signal normally for 3
minutes.

Consider the unit abnormal under the

following condition: When 2 or more
indoor units are connected to one
outdoor unit, indoor controller board
cannot receive a signal for 3 minutes
from outdoor controller circuit board, a
signal which allows outdoor controller
circuit board to transmit signals.

Cause

1 2 remote controllers are set as

“main.”

(In case of 2 remote controllers)

2 Remote controller is connected

with 2 indoor units or more.

Repetition of refrigerant

address

Defective transmitting/receiving

circuit of remote controller

Defective transmitting/receiving

circuit of indoor controller board
Noise has entered into transmis­sion wire of remote controller.

1 Contact failure, short circuit or,

miswiring (converse wiring) of
indoor/outdoor unit connecting
wire

2 Defective transmitting/receiv-

ing circuit of indoor controller
board

Defective transmitting/receiving

circuit of indoor controller board

Noise has entered into indoor/

outdoor unit connecting wire.

Countermeasure

1 Set a remote controller to main, and the

other to sub.

2 Remote controller is connected with only one

indoor unit.

3 The address changes to a separate setting.

~ Diagnose remote controller.

a) When “RC OK” is displayed, remote con-

trollers have no problem.
Turn the power off, and on again to check.
When becoming abnormal again, replace

indoor controller board.
b) When “RC NG” is displayed, replace

remote controller.
c)

When “RC E3” or “ERC 00-66” is displayed,

noise may be causing abnormality.

1 Check disconnection or looseness of indoor/

outdoor unit connecting wire of indoor unit or
outdoor unit.

Check all the units in case of twin indoor unit

system.

2~4Turn the power off, and on again to

check. If abnormality generates again,
replace indoor controller board or outdoor
controller circuit board.

* Other indoor controller board may have

defect in case of twin indoor unit system.

E7

Fb

(FB)*

E1

or

E2

Indoor/outdoor unit communication

error (Transmitting error)

Abnormal if “1” receiving is detected 30
times continuously though indoor controller
board has transmitted “0”.

Indoor controller board

Abnormal if data cannot be normally read
from the nonvolatile memory of the indoor
controller board.

Remote controller control board

1 Abnormal if data cannot be normally

read from the nonvolatile memory of the
remote controller control board.

(Check code: E1)

2 Abnormal if the clock function of remote

controller cannot be normally operated.

(Check code: E2)

1 Defective transmitting receiving

circuit of indoor controller board

2 Noise has entered into power

supply.

3 Noise has entered into outdoor

control wire.

1 Defective indoor controller

board

1 Defective remote controller 1 Replace remote controller.

1~3 Turn the power off, and on again to

check. If abnormality generates again,

replace indoor controller board.

1 Replace indoor controller board.

* The check code in the parenthesis indicates

PAR-31MAA model.

19

Check code

OCH564

PA

(2502)
(2500)

Abnormal point and detection method

Forced compressor stop

(due to water leakage abnormality)

1 When the intake temperature subtracted

from liquid pipe temperature is less than

-10°C, drain sensor detects whether it is
soaked in the water or not at the interval
of 90 seconds. (Drain pump will start
operating when the drain sensor detects
to be soaked in the water.)

2 The unit has a water leakage abnormality

when the following conditions, a) and b),
are satisfied while the above-mentioned
detection is performed.

a) The drain sensor detects to be

soaked in the water 10 times in a row.

b) The intake temperature subtracted

from liquid pipe temperature is
detected to be less than -10°C for a
total of 30 minutes.
(When the drain sensor detects to
be NOT soaked in the water, the
detection record of a) and b) will be
cleared.)

　The drain sensor detection is performed

in operations other than cooling. (When
the unit stops operating, during heat
ing or fan operation, when the unit stops
because of some abnormalities)

* Once the water leakage abnormality is

detected, abnormality state will not be
released until the main power is reset.

Cause

1 Drain pump trouble

2 Drain defective

· Drain pump clogging

· Drain pipe clogging

Open circuit of drain sensor
side heater

Contact failure of drain sensor
connector

Dew condensation on drain
sensor

· Drain water trickles along lead
wire

· Drain water waving due to filter

clogging

Extension piping connection
difference at twin, triple,
quadruple system

Miswiring of indoor/outdoor
connecting at twin, triple,

quadruple system

Room temperature thermistor/

liquid pipe temperature
themistor detection is defective.

Countermeasure

1 Check the drain pump.

2 Please check whether water can be drained.

Check the resistance of the drain sensor side

　heater.

Check the connector contact failure.

Check the drain sensor lead wire mounted.

Check the filter clogging.

Check the piping connection.

Check the indoor/outdoor connecting wires.

Check the room temperature display of

remote controller.

Check the indoor liquid pipe temperature

display of outdoor controller board.

20 21

7-4. TROUBLESHOOTING OF PROBLEMS

OCH564

Phenomena

(1) LED2 on indoor controller board

is off.

• When LED1 on indoor controller board is also off.
1 Power supply of rated voltage is not supplied to out-

door unit.

2 Defective outdoor controller circuit board

Power supply of 220~240V is not supplied to indoor

unit.

4 Defective indoor controller board

Cause

Note: Refer to the manual of outdoor unit for the detail of remote
controller.

Countermeasure

1 Check the voltage of outdoor power

supply terminal block (L, N) or (L

• When AC 220~240V is not detected,
check the power wiring to outdoor unit
and the breaker.

• When AC 220~240V is detected,
check 2 (below).

2 Check the voltage between outdoor

terminal block S1 and S2.

• When AC 220~240V is not detected,

—check the fuse on outdoor controller

circuit board.

—check the wiring connection.

• When AC 220~240V is detected,

check

Check the voltage between indoor terminal

block S1 and S2.

• When AC 220~240V is not detected,
check indoor/outdoor unit connecting
wire for miswiring.

• When AC 220~240V is detected,

check

4 Check the wiring connection between

TB4 and CN01. Check the fuse on indoor
controller board. If no problems are found,
indoor controller board is defective.

(below).

(below).

3, N).

(2) LED2 on indoor controller board

is blinking.

• When LED1 on indoor controller board is lit.
1 Mis-setting of refrigerant address for outdoor unit
(There is no unit corresponding to refrigerant

address “0”.)

• When LED1 on indoor controller board is also blinking.
Connection failure of indoor/outdoor unit connecting

wire

• When LED1 is lit
1 Miswiring of remote controller wires

Under twin indoor unit system, 2 or more indoor

2 Refrigerant address for outdoor unit is wrong or not

set.

Under grouping control system, there are some units

whose refrigerant address is 0.

Short-cut of remote controller wires
Defective remote controller

units

1 Check the setting of refrigerant address

for outdoor unit.
Set the refrigerant address to “0”.
(For grouping control system under

which 2 or more outdoor units are
connected, set one of the units to “0”.)

Set refrigerant address using SW1 (3-6)

on outdoor controller circuit board.

Check indoor/outdoor unit connecting wire
for connection failure.

1 Check the connection of remote

controller wires in case of twin triple
indoor unit system. When 2 or more
indoor units are wired in one refrigerant
system, connect remote controller wires
to one of those units.

2 Check the setting of refrigerant address

in case of grouping control system. If
there are some units whose refrigerant
addresses are 0 in one group, set one of
the units to 0 using SW1 (3-6) on outdoor
controller circuit board.

Remove remote controller wires and
check LED2 on indoor controller board.

• When LED2 is blinking, check the
short-cut of remote controller wires.

• When LED2 is lit, connect remote
controller wires again and:

if LED2 is blinking, remote controller
is defective; if LED2 is lit, connection
failure of remote controller terminal
block etc. has returned to normal.

21

7-5. TEST POINT DIAGRAM

OCH564

7-5-1. Indoor controller board

SLZ-KA25VAL3.TH SLZ-KA35VAL3.TH SLZ-KA50VAL3.TH
SLZ-KA25VAL3.TH-ER SLZ-KA35VAL3.TH-ER SLZ-KA50VAL3.TH-ER

CN51
Centrally control

- : Control signal

13V pulse input ( : +)

- : Operation indicator

13V DC ( : +)

- :

Malfunction indicator

13V DC ( : +)

CN2L

Connector
(LOSSNAY)

LED3

Transmission
(Indoor/outdoor)

CN21
Pipe temperature
Thermistor (TH22)

CN20

Room temperature
thermistor (TH21)

CN29
Condenser/evaporator
temperature thermistor
(TH23)

CN41
Connector
(HA terminal-A)

SWE

Emergency
operation

CN6V

Vane motor
output (MV)

SW2

Capacity
setting

SW3
Mode

selection

CN31
Drain sensor
(DS)

LED2

Power supply
(R.B)

CN105
Connector (IT)

CNMF
Fan motor output

F1
FUSE
(6.3A 250V)

CN22

Remote controller

–

connecting wire

}

(10.4~14.6V DC)

+

CN3C

Transmission
(Indoor/outdoor)
(0~24V DC)

CNP

Drain-pump
output (DP)
(208/230V AC)

CNC

Dew prevention
heater (H2)
(208/230V AC)

CN01
Power supply input
(208/230V AC)

CN90
Connect to the
wireless remote
controller board
(CNB)

LED1
Power supply
(I.B)

22

7-6. FUNCTIONS OF DIP SWITCH AND JUMPER WIRE

OCH564

Each function is controlled by the dip switch on control P.C. board.
Model setting and capacity setting are memorised in the nonvolatile memory of the indoor controller board.

The black square (■) indicates a switch position.

Switch

SW2

SW3

• Function setting becomes effective when the Dip switch SW3-5 is ON.
* Switch off SW3-5 when the function setting is done by wired remote controller.

Functions

Capacity
setting

Function
setting

Model

SLZ-KA25VAL3

SLZ-KA35VAL3

SLZ-KA50VAL3

Dip switch Function

SW3-1

SW3-2

SW3-3

SW3-4

SW3-5*

Setting by the DIP switch

Setting

1 2 3 4 5

1 2 3 4 5

1 2 3 4 5

Power failure
automatic recovery

Set temperature in
heating mode (4 deg up)

Fan speed when the
thermostat is OFF
(during heating mode)

SW3 function

ON
OFF

ON
OFF

ON
OFF

Action by switch opration

Available

Extra low

Not available

OFF

OFF

ON

ON

Not available

Stop

Available

Remarks

<Initial setting>
SW3

1 2 3 4 5

ON
OFF

23

7-7. TROUBLE CRITERION OF MAIN PARTS

OCH564

SLZ-KA25VAL3.TH SLZ-KA35VAL3.TH SLZ-KA50VAL3.TH
SLZ-KA25VAL3.TH-ER SLZ-KA35VAL3.TH-ER SLZ-KA50VAL3.TH-ER

Parts name

Room temperature
thermistor
(TH21)

Pipe temperature
thermistor/liquid
(TH22)

Condenser/evaporator
temperature thermistor
(TH23)

Vane motor (MV)

White

4

Blue

M

35

Yellow

Orange

Red

2
1

Drain pump (DP)

Yellow

1

2

Yellow

Drain sensor (DS)

1
2
3

Check method and criterion

Measure the resistance with a tester.
(Parts temperature 10 to 30°C)

Normal

4.3 to 9.6 k"

Measure the resistance between the terminals with a tester.
(At the ambient temperature 20 to 30°C)

Red — Yellow

Red — Blue

Red — Orange

Red — White

Measure the resistance between the terminals with a tester.
(At the ambient temperature 20 to 30°C)

Normal Abnormal

290 "

Measure the resistance between the terminals with a tester.
Measure the resistance after 3 minutes have passed since the power supply was intercepted.
(At the ambient temperature 0 to 60°C)

Normal

0.6 to 6.0 k"

Opened or short-circuited

Open or short

Open or short

Abnormal

NormalConnector Abnormal

300 " Open or short

Abnormal

(Refer to the next page for a detail.)

24 25

7-7-1. THERMIISTOR CHARACTERISTIC GRAPH

OCH564

<Thermistor Characteristic graph>

Thermistor for
lower temperature

•Room temperature thermistor (TH21)

•Pipe temperature thermistor/liquid (TH22)

•Condenser/evaporator temperature
thermistor (TH23)

Thermistor R0=15 kΩ ± 3%
Fixed number of B=3480 ± 2%

Rt=15exp { 3480( ) }

1

273+t

1

273

0˚C 15 kΩ

10˚C 9.6 kΩ

20˚C 6.3 kΩ
25˚C 5.2 kΩ
30˚C 4.3 kΩ
40˚C 3.0 kΩ

Thermistor for
drain sensor

< Thermistor for lower temperature >

50

40

30

20

Resistance (k")

10

0

-20 -10 0 10 20 30 40 50

10

Temperature (:)

< Thermistor for drain sensor >

Thermistor R

0=6.0 kΩ ±5%

Fixed number of B=3390 ± 2%

Rt=6exp { 3390( ) }

1

273+t

˚C 6.0 kΩ

0

˚C 3.9 kΩ

10

1

273

20˚C 2.6 kΩ
25˚C 2.2 kΩ

˚C 1.8 kΩ

30
40˚C 1.3 kΩ
60˚C 0.6 kΩ

9

8

7

6

5

4

Resistance (k")

3

2

1

0

-20 0 20 40 60 80

Temperature (:)

25

7-7-2. DC FAN MOTOR (FAN MOTOR/ INDOOR CONTROLLER BOARD)

OCH564

Check method of DC fan motor (fan motor / indoor controller circuit board)

Notes

1

· High voltage is applied to the connector (CNMF) for the fan motor. Pay attention to the service.

· Do not pull out the connector (CNMF) for the motor with the power supply on.
(It causes trouble of the indoor controller circuit
Self check

2

Symptom : The indoor fan cannot turn around.

Indoor controller board fuse check

board and fan motor.)

Is the fuse normal?

Yes

Wiring contact check

Contact of fan motor connector (CNMF)

Is there contact failure?

No

Power supply check (Remove the connector (CNMF))

Measure the voltage in the indoor controller circuit

No

Yes

Is the resistance
between the terminals of
drain pump normal?

Replace the drain pump.

Wiring recovery

board.

No

Yes

TEST POINT 1 : VDC (between 1 (+) and 4 (-) of the fan connector): VDC DC 310~340 V
TEST POINT 2 : VCC (between 5 (+) and 4 (-) of the fan connector): VCC DC 15 V

Is the voltage normal?

No

Replace indoor
controller board

Yes

Replace the fan motor.

OK

Check the operation of fan. END

NG

Replace indoor controller board.

OK

Check the operation

NG

END

Replace the fan motor.

Replace the fan motor.
Replace the indoor controller board.

8 4-WAY AIR FLOW SYSTEM

OCH564

8-1. FRESH AIR INTAKE (LOCATION FOR INSTALLATION)

At the time of installation, use the duct holes (cut out) located at the positions shown in following diagram, as and when required.

Fresh air intake

Detail drawing of fresh air intake

25

[100

3-[2.8 hole

Burring hole

120

Ceiling surface

118

[73.4

Cut out hole

120

Refrigerant pipe

Electrical Box

Drain pipe

8-2. FRESH AIR INTAKE AMOUNT & STATIC PRESSURE CHARACTERISTICS
SLZ-KA25VAL3.TH SLZ-KA35VAL3.TH SLZ-KA50VAL3.TH
SLZ-KA25VAL3.TH-ER SLZ-KA35VAL3.TH-ER SLZ-KA50VAL3.TH-ER

Taking air into the unit

Static pressure : P [Pa]

50

0.5 1.0 1.5 2.0 2.5 3.0 3.5

0

-50

-100

-150

-200

-250

NOTE: Fresh air intake amount should be 20% or less of

whole air amount to prevent dew dripping.

Air flow : Q [m

3

/min]

How to read curves

Q

Duct characteristics
at site

A

C

B

A

E C

A D

Curve in the

1

left graphs

0

2

3

Q

Qa

Q

Q…Designed amount of fresh air intake

<m3/min>

A…Static pressure loss of fresh air

intake duct system with air flow
amount Q <Pa>

B…Forced static pressure at air condi-

tioner inlet with air flow amount Q

<Pa>

C…Static pressure of booster fan with

air flow amount Q <Pa>

D…Static pressure loss increase

amount of fresh air intake duct sys­tem for air flow amount Q <Pa>

E…Static pressure of indoor unit with

air flow amount Q <Pa>

Qa…Estimated amount of fresh air

intake without D <m3/min>

8-3. OPERATION IN CONJUNCTION WITH DUCT FAN (BOOSTER FAN)

● Whenever the indoor unit operates, the
duct fan operates.
(1) Connect the optional multiple

remote controller adapter(PAC­SA88HA-E) to the connector CN51
on the indoor controller board.

(2) Drive the relay after connecting the

12V DC relay between the Yellow
and Orange connector wires.

Use a relay of 1W or smaller.

MB: Electromagnetic switch power

relay for duct fan.

X: Auxiliary relay (12V DC LY-1F)

Multiple remote
controller adapter
PAC-SA88HA-E

CN51

CN51
on
indoor unit
board

5

1

Connector (5P)

Indoor unit side

Indoor controller board

Green

Be sure to secure insulation
material by tape, etc.

Yellow

Orange

Red

Brown

Multiple remote
controller adapter
PAC-SA88HA-E

+

2727

~

MB

Installation at site

Be sure to secure insulation
material by tape, etc.

Distance between indoor
controller board and relay
must be within 10m.

8-4. FIxING HORIZONTAL VANE

OCH564

Horizontal vane of each air outlet can be fixed according to the environment where it is installed.

Setting procedure

1) Turn off a main power supply (Turn off a breaker).

2) Remove the vane motor connector in the direction of the arrow shown below with pressing the unlocking button as in the
figure below.

Insulate the disconnected connector with the plastic tape.

Vane motor

Vane motor

Connector

Horizontal vane

3) Set the vertical vane of the air outlet by hand slowly within the range in the table below.

Measured standard
position of the grille

Horizontal vane

<Set range>

Standard of

horizontal position

Level 30°

(Min.)

Downward 45° Downward 55°

Downward 70°

(Max.)

Unlocking button

Dimension A (mm) 21 25 28 30

* Dimension between 21 mm and 30 mm can be arbitrarily set.

Caution

.

Do not set the dimension out of the range.

Erroneous setting could cause dew drips, smudge on ceiling or malfunction of unit.

9 DISASSEMBLY PROCEDURE

OCH564

SLZ-KA25VAL3.TH SLZ-KA35VAL3.TH SLZ-KA50VAL3.TH
SLZ-KA25VAL3.TH-ER SLZ-KA35VAL3.TH-ER SLZ-KA50VAL3.TH-ER

Be careful when removing heavy parts.

OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS

1. Removing the air intake grille

(1) Slide the knob of air intake grille to the direction of the

arrow to open the air intake grille.

(2) Remove the string hook from the panel to prevent the grille

from dropping.

(3) Slide the hinge of the intake grille to the direction of the

arrow 2 and remove the air intake grille.

2. Removing the fan guard

(1) Open the air intake grille.
(2) Remove the 3 screws of fan guard.

3. Removing the panel

(1) Remove the air intake grille. (Refer to procedure 1)

Corner panel (See Figure 2)

(1) Remove the screw of the corner.
(2) Slide the corner panel to the direction of the arrow

remove the corner panel.

Panel (See Photo 2)

(1) Disconnect the connector that connects with the unit.
(2) Remove the 2 screws from the panel and loose another

2 screws, which are fixed to the oval hole, have different
diameter.

(3) Rotate the panel a little to remove the screws. (Slide the

panel so that the screw comes to a larger diameter of the
oval hole, which has 2 different diameters.)

, and

Figure 1

Air intake grille

Air intake grille knob

Photo 1

Fan guard

Figure 2

Corner
panel

Photo 2

Connectors

Screws

Grille

Screw

Corner
panel

Screws

Air intake grille

Panel

Screws

Panel

4. Removing the electrical parts

(1) Remove the 2 screws and the control box cover.

<Electrical parts in the control box>

• Indoor controller board (I.B)

• Terminal block (TB4)

2929

Photo 3

Indoor controller board
(I.B)

Terminal block
(TB4)

OPERATING PROCEDURE

OCH564

PHOTOS & ILLUSTRATIONS

5. Removing the room temperature thermistor (TH21)

(1) Remove the panel. (Refer to procedure 3)
(2) Pull out the room temperature thermistor from the drain

pan.

(3) Remove the 2 screws fixed to the control box cover, and

remove the control box cover.

(4) Remove the connector (CN20) from the indoor controller

board, and disconnect the room temperature thermistor.

6. Removing the drain pan

(1) Remove the panel. (Refer to procedure 3)
(2) Remove the room temperature thermistor and the 2 lead

wires held with fastener; wireless controller board relay
connector (9P red) and panel relay connector (10P white).

(3) Remove the 4 screws fixed to the drain pan, and remove

the drain pan.

(4) Remove the fan guard. (Refer to procedure 2)

7. Removing the pipe temperature thermistor/liquid (TH22)

and condenser/evaporator temperature thermistor (TH23)

(1) Remove the panel. (Refer to procedure 3)
(2) Remove the drain pan. (Refer to procedure 6)
(3) Disconnect the indoor coil thermistor from the holder.
(4) Remove the 3 screws fixed to the piping cover, and remove

the piping cover. (See Photo 9)

(5) Remove the 2 screws fixed to the control box cover, and

remove the control box cover.

Photo 4

Screw

Room

temperature
thermistor
(TH21)

Screw

Photo 5

Control box

Control box

Connectors

Drain plug

Screw

Drain pan

Screw

Fan guard

Pipe temperature thermistor/liquid (TH22)

(6) Remove the connector (CN21) from the indoor controller

board, and disconnect the pipe temperature thermistor/liquid.

Condenser/evaporator temperature thermistor (TH23)

(6) Remove the connector (CN29) from the indoor controller

board, and disconnect the condenser/evaporator temperature
thermistor.

8. Removing the fan motor (MF)

(1) Remove the panel. (Refer to procedure 3)
(2) Remove the drain pan. (Refer to procedure 6)
(3) Remove the nut and the washer from the turbo fan, and

remove the turbo fan.

(4) Remove the 2 screws fixed to the control box cover, and

remove the control box cover.

(5) Disconnect the connectors of the (fan 1) and the (fan 2)

from the indoor controller board.

(6) Remove the 3 screws fixed to the piping cover, and remove

the piping cover. (See Photo 9)

(7) Remove the 6 screws fixed to the flat plate, and remove

the flat plate.

(8) Disconnect the lead wires to the direction of the fan motor,

and remove the 3 nuts of the fan motor.

Pipe temperature
thermistor/liquid
(TH22)

Photo 6

Screws

Lead

wires

Flat plate

Condenser/evaporator
temperature thermistor
(TH23)

Screw

Nut

Fan motor
(MF)

Nut

Screws

30

Screw

Nut

OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS

OCH564

9. Removing the drain pump (DP) and drain sensor (DS)

(1) Remove the panel. (Refer to procedure 3 )
(2) Remove the drain pan. (Refer to procedure 6)
(3) Remove the 2 screws fixed to the control box cover, and

remove the control box cover.

(4) Remove the connectors of the (CNP) and the (CN31)

from the indoor controller board.

(5) Remove the 1 screw fixed to the cover, and remove the

cover.

(6) Disconnect the lead wires to the direction of the drain

pump. (See Photo 7)
(7) Remove the 3 screws of the drain pump.
(8) Cut the drain hose band, pull out the drain hose from the

drain pump.
(9) Pull out the drain pump.
(10) Remove the drain sensor and the holder.

10. Removing the heat exchanger

(1) Remove the panel. (Refer to procedure 3 )
(2) Remove the drain pan. (Refer to procedure 6)
(3) Remove the nut and the washer from the turbo fan, and

remove the turbo fan.

(4) Remove the 2 screws fixed to the control box cover, and

remove the control box cover.

(5) Disconnect the connector of the (fan) from the indoor con-

troller board.

(6) Remove the 3 screws fixed to the piping cover, and remove

the piping cover. (See Photo 9)
(7) Remove the pipe temperature thermistor/liquid and
condenser/evaporator temperature thermistor. (Refer to

procedure 7)
(8) Disconnect the lead wires to the direction of the fan motor.
(9) Remove the 1 coil support screw, the 2 inside coil screws

(See Photo 10), and the 4 outside coil screws (See Photo 9)

from the heat exchanger, and remove the heat exchanger.

Photo 7

Control
box

Photo 8

Drain
hose

Screw

Photo 9

Coil

screws

Screws of
piping cover

Piping cover

Screw

Drain sensor (DS) Drain pump (DP)

Fixing band

Cover

Lead wires

Lead wires

Screws

Control box

Coil

screws

Control box

31

Photo 10

Coil

screws

Coil

support

Heat exchanger

Coil support screw

HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN

Copyright 2014 MITSUBISHI ELECTRIC CORPORATION
Distributed in Jun. 2014 No.OCH564
Made in Japan

New publication, effective Jun. 2014
Specifications are subject to change without notice.