Fujitsu 24LMAS1, 18LMAS1 Service Manual

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Page 1

AIR CONDITIONER

Wall mounted type

SERVICE MANUAL

INDOOR

OUTDOOR

ASUH18LMAS ASUH24LMAS

AOUH18LMAS1 AOUH24LMAS1

SR_AS052EF_03

2021.11.17

Page 2

Notices:

• Product specifications and design are subject to change without notice for future improvement.

• For further details, please check with our authorized dealer.

Trademarks

FGLair™ is trademark of Fujitsu General Limited in the United States, other countries or both.

Google Play™ is trademark of Google Inc.

App Store® is a service mark of Apple Inc., registered in the U.S. and other countries.

Page 3

CONTENTS

1. GENERAL INFORMATION

2. TECHNICAL DATA AND PARTS LIST

3. TROUBLESHOOTING

4. CONTROL AND FUNCTIONS

5. FILED WORKING

Page 4

Page 5

1. GENERAL INFORMATION

SR_CH01_AS052EF_01

2021.11.01

Page 6

CONTENTS

1. GENERAL INFORMATION

1. Specifications..............................................................................................01-1

1-1. Indoor unit ......................................................................................................................01-1

1-2. Outdoor unit....................................................................................................................01-3

2. Dimensions..................................................................................................01-4

2-1. Indoor unit ......................................................................................................................01-4

2-2. Outdoor unit....................................................................................................................01-8

Page 7

1. Specifications

GENERAL

1-1. Indoor unit

INFORMATION

Type

Model name ASUH18LMAS ASUH24LMAS

Power supply 208/230 V ~ 60 Hz Power supply intake Outdoor unit Available voltage range 187—253 V

Capacity

Input power

Current

EER Cooling

COP Heating

SEER Cooling Btu/h→ 21.1 22.5 HSPF Heating Btu/h→ 12.5 12.0

Power factor

Moisture removal pints/h (L/h) 4.0 (1.9) 6.3 (3.0)

Maximum operating current*

Fan

Sound pressure level*

Heat exchanger type

Enclosure

Dimensions (H × → × D)

→eight

Connection pipe

Drain hose

Wall mounted

Inverter heat pump

Cooling

Heating

Heating (17°F)

Cooling

Heating

Heating (17°F) Cooling Heating 7.0 8.3

Cooling Heating 98.1 98.0

Cooling

Heating 13.9 15.9

Cooling

Airflow rate

Heating

Type × Q'ty Crossflow fan × 1 Motor output → 59 78

Cooling

Heating

Dimensions (H × → × D) in (mm)

Fin pitch FPI (mm)

Rows × Stages

Pipe type Copper Fin type Aluminum Material Polystyrene

Color

Net

Gross

Net Gross 36 (16.5) 49 (22.0)

Size

Method Flare Material PP+HDPE

Tip diameter in (mm)

Rated

Min.—Max.

Rated

Min.—Max.

Rated

Max.

Rated Min.—Max. 0.45—1.86 0.43—2.63 Rated 1.58 1.87 Min.—Max. 0.55—2.82 0.52—3.53 Rated 1.28 1.51

Max. 0.41—3.06 0.39—3.60

Rated A

HIGH MED 489 (830) 530 (900) LO→ 377 (640) 436 (740) QUIET 300 (510) 371 (630) HIGH 589 (1,000) 730 (1,240) MED 500 (850) 530 (900) LO→ 377 (640) 436 (740) QUIET 300 (510) 371 (630)

HIGH MED 41 42 LO→ 35 37 QUIET 30 33 HIGH 46 48 MED 41 38 LO→ 35 34 QUIET 30 30

Liquid Gas Ø5/8 (Ø15.88)

k→ 5.28 6.45

Btu/h 18,000 22,000

k→ 2.05—5.86 2.67—8.00

Btu/h 7,000—20,000 9,100—27,300

k→ 6.33 7.39

Btu/h 21,600 25,200

k→ 2.34—8.50 2.40—10.84

Btu/h 8,000—29,000 8,200—37,000

k→ 3.99 4.60

Btu/h 13,600 15,700

k→ 6.95 8.41

Btu/h 23,700 28,700

k→

k→/k→ 3.80 3.66 Btu/h→ 13.0 12.5 k→/k→ 4.00 3.95 Btu/h→ 13.6 13.5

CFM (m3/h)

dB (A)

Main 1: 8-1/4 × 31-5/16 × 1-1/16

Main 2: 4-15/16 × 31-5/16 × 1-1/16

Sub 1: 3-5/16 × 31-5/16 × 1/2

in (mm)

lb (kg)

in (mm)

12-11/16 × 42-7/16 × 13-5/8

1.38 1.76

6.2 7.8

96.8 98.1

13.4 15.4

577 (980) 647 (1,100)

46 46

(210 × 796 × 26.6)

(126 × 796 × 26.6)

(84 × 796 × 13.3)

Main 1: 21 (1.2) Main 2: 21 (1.2)

Sub 1: 18 (1.4)

Main 1: 2 × 10

Main 2: 2 × 6

Sub 1: 1 × 4

11 × 38-9/16 × 9-7/16

(280 × 980 × 240)

(322 × 1,078 × 346)

Approximate color of Munsell N 9.25/

29 (13.0) 36 (16.5)

Ø19/32 to 21/32 (Ø15.0 to 16.8) (O.D.)

→hite

Ø3/8 (Ø9.52)

Ø17/32 (Ø13.8) (I.D.),

18-3/16 × 35-6/16 × 1-1/16

13-6/16 × 45-4/16 × 11

(340 × 1,150 × 280)

15-15/16 × 50 × 17-11/16

(405 × 1,270 × 450)

(462 × 898 × 26.6)

21 (1.2)

2 × 22

GENERAL

INFORMATION

1-1. Indoor unit - (01-1) - 1. Specifications

Page 8

Type

Model name ASUH18LMAS ASUH24LMAS

GENERAL

INFORMATION

Operation range

Remote controller type

NOTES:

• Specifications are based on the following conditions: – Cooling: Indoor temperature of 80°FDB (26.67°CDB) /67°F→B (19.44°C→B), and outdoor temperature of 95°FDB (35°CDB) / 75°F→B (23.9°C→B). – Heating: Indoor temperature of 70°FDB (21.11°CDB) /59°F→B (15.56°C→B), and outdoor temperature of 47°FDB (8.33°CDB) /43°F→B (6.11°C→B).

– *1: Heating (17°F): Indoor temperature of 70°FDB (21.11°CDB) /60°F→B (15.56°C→B), and outdoor temperature of 17°FDB (-8.33°CDB) /15°F→B (-9.44°C→B). – Pipe length: 25 ft (7.5 m), Height difference: 0 ft (0 m). (Between outdoor unit and indoor unit.)

• Protective function might work when using it outside the operation range.

• *2: Maximum current is maximum value when operated within the operation range.

• *3: Sound pressure level:

– Measured values in manufacturer’s anechoic chamber. – Because of the surrounding sound environment, the sound levels measured in actual installation conditions might be higher than the specified values here.

• *4: Available on Google Play™ store or on App Store®. Optional →LAN adapter is also required. For details, refer to the setting manual.

Cooling

Heating °F (°C) 86 (30) or less

°F (°C) 64 to 90 (18 to 32)

%RH 80 or less

→ireless (→ired, Mobile app*4 [FGLair™] [option])

Wall mounted

Inverter heat pump

GENERAL

INFORMATION

1-1. Indoor unit - (01-2) - 1. Specifications

Page 9

1-2. Outdoor unit

Type Inverter heat pump

GENERAL

INFORMATION

Model name AOUH18LMAS1 AOUH24LMAS1

Power supply 208/230 V ~ 60 Hz Power supply intake Outdoor unit Available voltage range 187—253 V Starting current A 7.0 8.3

Fan

Sound pressure level *1

Heat exchanger type

Compressor

Refrigerant

Refrigerant oil

Enclosure

Dimensions (H × → × D)

→eight

Connection pipe

Drain hose

Operation range

NOTES:

• Specifications are based on the following conditions: – Cooling: Indoor temperature of 80 °FDB (26.67 °CDB) / 67 °F→B (19.44 °C→B), and outdoor temperature of 95 °FDB (35 °CDB) / 75 °F→B (23.9 °C→B). – Heating: Indoor temperature of 70 °FDB (21.11 °CDB) / 59 °F→B (15 °C→B), and outdoor temperature of 47 °FDB (8.33 °CDB) / 43 °F→B (6.11 °C→B). – Pipe length: 25 ft (7.5 m), Height difference: 0 ft (0 m). (Between outdoor unit and indoor unit.)

• Protective function might work when using it outside the operation range.

• *1: Sound pressure level – Measured values in manufacturer’s anechoic chamber. – Because of the surrounding sound environment, the sound levels measured in actual installation conditions might be higher than the specified values here.

Airflow rate

Type × Q'ty Propeller fan × 1 Motor output → 100

Type DC twin rotary Motor output → 1,360

Net Gross 38-1/16 × 40-7/16 × 17-1/2 (966 × 1,027 × 445) Net Gross 134 (61)

Size

Method Flare Pre-charge length Max. length 164 (50) Max. height difference 98 (30) Material LDPE

Tip diameter in (mm)

Cooling Heating 1,742 (2,960) 2,187 (3,715)

Cooling Heating 50 54 Dimensions (H × → × D)

Fin pitch FPI

Rows × Stages

Pipe type Copper

Fin type

Type R410A

Charge

Type POE (RB68) Amount Material Steel sheet

Color

Liquid Gas Ø5/8 (Ø15.88)

Cooling Heating 5 to 75 (-15 to 24)

CFM (m3/h)

dB (A)

in (mm)

Type (Material) Aluminum Surface treatment Blue fin

lb oz 3 lb 15 oz 4 lb 10 oz

g 1,800 2,100

in3 (cm3)

in (mm)

lb (kg)

in (mm)

ft (m)

°F (°C)

1,683 (2,860) 1,936 (3,290)

49 52

Main 1: 29-3/4 × 35-5/8 × 11/16 (756 × 905 × 18.19) Main 2: 29-3/4 × 35-5/8 × 11/16 (756 × 905 × 18.19)

Approximate color of Munsell 10↔R 7.5/1.0

49 (15) 66 (20)

Main 1: 18 (1.45) Main 2: 18 (1.45)

Main 1: 1 × 36 Main 2: 1 × 36

48.8 (800)

Beige

31 × 37 × 12-5/8 (788 × 940 × 320)

117 (53)

Ø3/8 (Ø9.52)

Ø1/2 (Ø13.0) (I.D.),

Ø5/8 to 11/16 (Ø16.0 to 16.7) (O.D.)

14 to 115 (-10 to 46)

GENERAL

INFORMATION

1-2. Outdoor unit - (01-3) - 1. Specifications

Page 10

2. Dimensions

38-9/16 (980) 9-7/16 (240)

11 (280)

for pipe inlet

Ø3-1/8 (80)

1-15/16 (50)

2-3/8 (60)

16-15/16 (430)

2-1/16 (52)

Outline of indoor unit

for pipe inlet Ø3-1/8 (80)

2-13/16

(72)

16-7/16 (418)

3-9/16

(91)

15-3/4 (400) 3-9/16

(90)

16-1/4 (413)3-1/16

(77)

16-7/16 (417)

19 (482)

20-1/16 (510)

GENERAL

2-1. Indoor unit

INFORMATION

Model: ASUH18LMAS

GENERAL

INFORMATION

Unit: in (mm)

2-1. Indoor unit - (01-4) - 2. Dimensions

Page 11

Installation space requirement

60 (1,500) or more

71 (1,800) or more

2 50) or more

2 (40) or more

5 (117) or more

71 or more

3 (70) or more

7 (160) or more

Wall hook bracket

Outline of the indoor unit



Provide sufficient installation space for product safety.

GENERAL

INFORMATION

CAUTION

GENERAL

INFORMATION

Do not place any other electrical products or household belongings under the product. Condensation dripping from the product might get them wet, and may cause damage or malfunction to the property.

Unit: in (mm)

2-1. Indoor unit - (01-5) - 2. Dimensions

Page 12

¢ Model: ASUH24LMAS

Unit: in (mm)

Outline of unit

20-1/2 (520)

3-9/16 (90)

13/16 (20)

2-1/2 (64)

18-7/8 (479)2-6/16 (61)

4-1/4

(108)19-6/8 (502)

20-1/2 (520)

1-15/16 (50)

7/16 (11)

13-6/16 (340)

ø80

13-6/16 (340)

11 (280)

10/16 (16)

45-1/4 (1,150)

19 (483)

21-7/16 (544)

22-1/16 (560)

45-1/4 (1,150)

GENERAL

INFORMATION

GENERAL

INFORMATION

2-1. Indoor unit - (01-6) - 2. Dimensions

Page 13

Installation space requirement

2-1/2 (63)

or more

3-8/1 (80)

or more

1-15/16 (50)

or more

1-15/16 (50) or more

2-3/4 (70) or more

Outline of unit

5-1/2 (140)

or more

59-1/16 (1,500) or more

70-7/8 (1,800) or more

Unit: in (mm)



Provide sufficient installation space for product safety.

GENERAL

INFORMATION

CAUTION

GENERAL

INFORMATION

Do not place any other electrical products or household belongings under the product. Condensation dripping from the product might get them wet, and may cause damage or malfunction to the property.

2-1. Indoor unit - (01-7) - 2. Dimensions

Page 14

2-2. Outdoor unit

Top view

Bottom view

Side view

Front view

37 (940)

12-5/8 (320)

1-9/16 (40) 9/16 (14)

(25)

1 (25)

7/8 (23)

2-16/16 (75)

2-3/16 (55)

2-1/2

(63) 9/16 (15)

15-3/8 (390)

3-1/2

(89)

31 (788)

7/8 (23)

1/2 (13)

4-3/4 (120)

5-1/16 (129)

3-3/8 (85)

1-15/16 (50)

5/8

(16)

1-7/8

(48)

1-15/16 (50)

2-5/16 (59)

5-3/16 (131)

3-3/4 (95)

3-3/4 (96)

5-1/2

(140)

2-Ф7/8 (22)

Cable port

2-Ф7/8 (22)

Cable port

2-Ф1/8 (28)

Cable port

2-Ф1/8 (28)

Cable port

Pipe port

25-9/16 (650)

13-7/8 (352)

3-way valve

(Gas)

3-way valve

(Liquid)

1-1/4 (48)

Liquid

Detail A

5-5/8

(143)

5-13/16

(147)

2-3/16 (55)

Liquid

1-9/16

(40)

12-5/8 (320)

10-7/16

(265)

13-15/16 (354)

10-1/2 (266)

Liquid

11-5/8 (296)

Gas

2-1/2 (64)

Gas

Rear view

Detail B

Detail C

Models: AOUH18LMAS1 and AOUH24LMAS1

GENERAL

INFORMATION

Unit: in (mm)

GENERAL

INFORMATION

2-2. Outdoor unit - (01-8) - 2. Dimensions

Page 15

2. TECHNICAL DATA AND PARTS LIST

SR_CH02_AS052EF_04

2021.11.17

Page 16

CONTENTS

2. TECHNICAL DATA AND PARTS LIST

1. Precautions..................................................................................................02-1

2. Indoor unit parts list....................................................................................02-2

2-1. Model: ASUH18LMAS....................................................................................................02-2

2-2. Model: ASUH24LMAS....................................................................................................02-6

3. Outdoor unit parts list...............................................................................02-10

3-1. Models: AOUH18LMAS1 and AOUH24LMAS1............................................................02-10

4. Accessories ...............................................................................................02-14

4-1. Indoor unit ....................................................................................................................02-14

4-2. Outdoor unit..................................................................................................................02-16

5. Refrigerant system diagrams...................................................................02-17

5-1. Models: AOUH18LMAS1 and AOUH24LMAS1............................................................02-17

6. Wiring diagrams ........................................................................................02-18

6-1. Indoor unit ....................................................................................................................02-18

6-2. Outdoor unit..................................................................................................................02-19

7. PC board diagrams ...................................................................................02-20

7-1. Models: ASUH18LMAS and ASUH24LMAS.................................................................02-20

7-2. Models: AOUH18LMAS1 and AOUH24LMAS1............................................................02-21

Page 17

1. Precautions

→hen you start servicing, pay attention to the following points. For detailed precautions, refer to the installation manual of the products.

CAUTION

• Service personnel – Any person who is involved with working on or breaking into a refrigerant circuit should hold a

current valid certificate from an industry-accredited assessment authority, which authorizes

TECHNICAL DATA

AND PARTS LIST

their competence to handle refrigerants safely in accordance with an industry recognized assessment specification.

– Servicing shall only be performed as recommended by the equipment manufacturer. Mainte-

nance and repair requiring the assistance of other skilled personnel shall be carried out under the supervision of the person competent in the use of flammable refrigerants.

– Servicing shall be performed only as recommended by the manufacturer.

• →ork – →ork in confined spaces shall be avoided. – The area around the workspace shall be sectioned off. – Electric shock may occur. After turning off the power, always wait 5 minutes before touching

electrical components.

– Do not touch the fins of the heat exchanger. Touching the heat exchanger fins could result in

damage to the fins or personal injury such as skin rupture. – Do not place any other electrical products or household belongings under the product. – Condensation dripping from the product might get them wet, and may cause damage or mal-

function to the property.

TECHNICAL DATA

AND PARTS LIST

• Service parts information and design are subject to change without notice for product improvement.

• For the latest information of the service parts, refer to our Service Portal. https://fujitsu-general.force.com/portal/

• Precise figure of the service parts listed in this manual may differ from the actual service parts.

- (02-1) - 1. Precautions

Page 18

2. Indoor unit parts list

20 19

2-1. Model: ASUH18LMAS

Exterior parts

TECHNICAL DATA

AND PARTS LIST

TECHNICAL DATA

AND PARTS LIST

2-1. Model: ASUH18LMAS - (02-2) - 2. Indoor unit parts list

Page 19

Item no. Part no. Part name Service part

1 9388158013 Bracket panel ♦ 2 9387476002 Screw cap ♦ 3 9313951047 Conduit holder ♦ 4 9383729027 →ire cover assy B ♦ 5 9387597035 →ire cover assy ♦ 6 9383765056 →LAN adapter holder assy ♦ 7 9387479010 Louver assy (Up/Down) ♦ 8 9323342033 Under cover R ♦

TECHNICAL DATA

AND PARTS LIST

9 9332911008 Electric filter holder ♦

TECHNICAL DATA

AND PARTS LIST

10 9317250009 Air cleaning filter assy ♦ 11 9332438895 →ireless remote controller ♦ 12 9318912005 Remote controller holder ♦ 13 9384977007 Front panel total assy ♦ 14 9387756210 Intake grille assy ♦ 15 9323340008 Air filter ♦ 16 9333719009 Grille clamper L ♦ 17 9333704005 Grille clamper R ♦ 18 9323341036 Under cover L ♦ 19 9333608006 Bush ♦ 20 9383730030 Louver spring ♦

a — Front panel — b — Panel cover — c — Front panel B —

2-1. Model: ASUH18LMAS - (02-3) - 2. Indoor unit parts list

Page 20

Chassis

TECHNICAL DATA

AND PARTS LIST

TECHNICAL DATA

AND PARTS LIST

2-1. Model: ASUH18LMAS - (02-4) - 2. Indoor unit parts list

Page 21

Item no. Part no. Part name Service part

50 9383735158 Evaporator total assy ♦ 51 9387467000 Room thermistor holder ♦ 52 9901013010 Terminal 3P ♦ 53 9316577008 Thermistor spring B ♦ 54 9711732026 Main PCB ♦ 55 9900627041 Thermistor assy ♦ 56 9711146052 Display assy ♦ 57 9711147011 Indicator PCB ♦

TECHNICAL DATA

AND PARTS LIST

58 9387587173 Base assy ♦

TECHNICAL DATA

AND PARTS LIST

59 9388150000 Pipe bracket A ♦ 60 9388155005 Under cover C ♦ 61 9388182001 Screw cap ♦ 62 9603821005 DC fan motor ♦ 63 9387488043 Cable guide ♦ 64 9387714012 Gear case assy ♦ 65 9901011016 Stepping motor ♦ 66 9383728006 R and L louver SPM assy ♦ 67 9901011023 Stepping motor ♦ 68 9387590142 Drain pan total assy ♦ 69 9316177017 Drain cap ♦ 70 9316904002 Drain hose assy ♦ 71 9333628004 Bearing D assy ♦ 72 9387055054 Crossflow fan assy ♦

— 9901010071

→ire with connector (CN75 on Main PCB—→LAN adapter [option])

♦

a — Control box — b — Control cover — c — Display case — d — Motor case — e — Motor cover assy —

f — Pipe bracket —

2-1. Model: ASUH18LMAS - (02-5) - 2. Indoor unit parts list

Page 22

2-2. Model: ASUH24LMAS

Exterior parts

TECHNICAL DATA

AND PARTS LIST

TECHNICAL DATA

AND PARTS LIST

2-2. Model: ASUH24LMAS - (02-6) - 2. Indoor unit parts list

Page 23

Item no. Part no. Part name Service part

1 9386990004 Bracket panel ♦ 2 9313951047 Conduit holder ♦ 3 9386958004 Louver U ♦ 4 9386959001 Louver Z ♦ 5 9383765063 →LAN adapter holder assy ♦ 6 9387074017 →ire cover assy ♦ 7 9315212016 Air clean filter assy ♦

TECHNICAL DATA

AND PARTS LIST

8 9386960007 Air filter ♦

TECHNICAL DATA

AND PARTS LIST

9 9332438895 →ireless remote controller ♦ 10 9318912005 Remote controller holder ♦ 11 9386986007 Screw cap ♦ 12 9387072211 Front panel total assy ♦ 13 9382114039 Intake grille assy ♦

a — Front panel —

2-2. Model: ASUH24LMAS - (02-7) - 2. Indoor unit parts list

Page 24

Chassis

TECHNICAL DATA

AND PARTS LIST

TECHNICAL DATA

AND PARTS LIST

2-2. Model: ASUH24LMAS - (02-8) - 2. Indoor unit parts list

Page 25

Item no. Part no. Part name Service part

50 9387064155 Evaporator total assy ♦ 51 9901013010 Terminal ♦ 52 9711732033 Main PCB ♦ 53 9316577008 Thermistor spring B ♦ 54 9900627027 Thermistor assy ♦ 55 9386988001 Room thermistor holder ♦ 56 9711146090 Display assy ♦

TECHNICAL DATA

AND PARTS LIST

57 9711147035 Indicator PCB ♦

TECHNICAL DATA

AND PARTS LIST

58 9603933005 DC fan motor ♦ 59 9361756007 Drain hose insulation T ♦ 60 9387063004 Link holder assy ♦ 61 9900139186 Step motor ♦ 62 9387062007 Gear cover assy ♦ 63 9900384234 Step motor ♦ 64 9387060034 Casing assy ♦ 65 9318743012 Pipe bracket ♦ 66 9388540009 Drain hose assy ♦ 67 9316177017 Drain cap ♦ 68 9387055009 Crossflow fan assy ♦ 69 9306628017 Bearing C assy ♦

a — Box shield assy —

b — Control box —

c — PCB holder A —

d — Control cover —

e — Motor cover —

f — Motor cover — g — Cable guide — h — Casing —

2-2. Model: ASUH24LMAS - (02-9) - 2. Indoor unit parts list

Page 26

3. Outdoor unit parts list

3-1. Models: AOUH18LMAS1 and AOUH24LMAS1

Exterior parts and chassis

TECHNICAL DATA

AND PARTS LIST

TECHNICAL DATA

AND PARTS LIST

3-1. Models: AOUH18LMAS1 and AOUH24LMAS1 - (02-10) - 3. Outdoor unit parts list

Page 27

Item no. Part no. Part name Service part

1 9383880001 Top panel assy ♦ 2 9383779008 Protective net ♦ 3 9375361013 Net rubber ♦ 4 313728262708 Thermistor spring A ♦ 5 9900984038 Thermistor (Heat exchanger temp.) ♦ 6 9900727154 Thermistor assy (Evaporator and Compressor temp.) ♦ 7 9383607004 Thermo holder ♦

TECHNICAL DATA

AND PARTS LIST

8 9383874000 Right panel sub assy ♦

TECHNICAL DATA

AND PARTS LIST

9 9384997005 Rear pipe cover ♦

10 9709686317 Inverter PCB ♦

9711431578 Main PCB (18 model) ♦

9711431585 Main PCB (24 model) ♦ 12 9900203085 Terminal ♦ 13 9383871016 Base assy ♦ 14 313166024302 Drain cap ♦ 15 9303029015 Drain assy ♦ 16 9383876004 Service panel sub assy ♦ 17 9384196019 Front pipe cover ♦ 18 9380114000 Emblem rear ♦ 19 9383863035 Front panel assy ♦ 20 9350680009 Fan guard assy ♦ 21 9383336003 Propeller fan ♦ 22 9603732011 DC fan motor ♦ 23 9383862007 Motor bracket assy ♦ 24 9383882005 Left panel sub assy ♦ 25 9374420711 Condenser sub assy ♦

— 9711198006

— 9711203038

— 9711204004

— 9711205001

— 9711212009

— 9711213006

— 9711214003

→ire with connector (P108 on Main PCB—Terminal)

→ire with connector (P660 on Main PCB—P662 on Inverter PCB)

→ire with connector (P661 on Main PCB—P663 on Inverter PCB)

→ire with connector (P350 on Main PCB—P351 on Inverter PCB)

→ire with connector (P650 on Inverter PCB—DC fan motor)

→ire with connector (P770 on Inverter PCB)

→ire with connector (Pressure switch)

♦

a — Separate wall assy — b — Control box unit —

3-1. Models: AOUH18LMAS1 and AOUH24LMAS1 - (02-11) - 3. Outdoor unit parts list

Page 28

Compressor

TECHNICAL DATA

AND PARTS LIST

TECHNICAL DATA

AND PARTS LIST

3-1. Models: AOUH18LMAS1 and AOUH24LMAS1 - (02-12) - 3. Outdoor unit parts list

Page 29

Item no. Part no. Part name Service part

50 9380516064 Sound insulator (Top) ♦ 51 9379647243 Sound insulator (Body) ♦ 52 9900565091 Thermistor (Outdoor temp.) ♦ 53 9357804002 Thermostat holder ♦ 54 9900186029 Pressure switch ♦ 55 9374425723 4-way valve assy ♦ 56 9970194016 Solenoid ♦

TECHNICAL DATA

AND PARTS LIST

57 9383855115 Refrigerant volume adjustment unit ♦

TECHNICAL DATA

AND PARTS LIST

58 9970209000 Expansion valve coil ♦ 59 9370947328 Expansion valve assy ♦ 60 9379079013 3-way valve assy ♦ 61 9377958037 3-way valve assy ♦ 62 9900985035 Thermistor (Compressor temp.) ♦ 63 9810028006 Thermistor stopper ♦ 64 9379179096 Rubber washer G ♦ 65 9377973016 Special nut ♦ 66 9810666000 Compressor assy ♦

a — Joint pipe D — b — →iring fixation unit —

3-1. Models: AOUH18LMAS1 and AOUH24LMAS1 - (02-13) - 3. Outdoor unit parts list

Page 30

4. Accessories

4-1. Indoor unit

Model: ASUH18LMAS

Part name Exterior Q’ty Part name Exterior Q’ty

TECHNICAL DATA

AND PARTS LIST

Operating manual

1 Tapping screw (large) 5

TECHNICAL DATA

AND PARTS LIST

Installation manual

Remote controller

Remote controller holder

Cloth tape

→all hook bracket

1 Tapping screw (small) 2

1 Battery 2

1 Filter holder 2

1 Air cleaning filters 1

4-1. Indoor unit - (02-14) - 4. Accessories

Page 31

Model: ASUH24LMAS

Part name Exterior Q’ty Part name Exterior Q’ty

Operating manual

TECHNICAL DATA

AND PARTS LIST

Installation manual

→all hook bracket

Remote controller

Battery

Remote controller holder

1 Drain hose insulation 1

1 Cloth tape 1

1 Tapping screw (large) 8

1 Tapping screw (small) 2

2 Air cleaning filters 1

1 Filter holder 2

TECHNICAL DATA

AND PARTS LIST

4-1. Indoor unit - (02-15) - 4. Accessories

Page 32

4-2. Outdoor unit

Models: AOUH18LMAS1 and AOUH24LMAS1

Part name Exterior Q’ty Part name Exterior Q’ty

Installation manual

TECHNICAL DATA

AND PARTS LIST

Drain pipe

1 Drain cap 3

TECHNICAL DATA

AND PARTS LIST

4-2. Outdoor unit - (02-16) - 4. Accessories

Page 33

5. Refrigerant system diagrams

: Cooling : Heating

: Thermistor (Compressor temperature)

: Thermistor (Discharge temperature)

: Thermistor (Outdoor temperature)

: Thermistor (Heat Exchanger Out temperature)

: Thermistor (Room temperature)

: Thermistor (Pipe temperature)

: Thermistor (Heat Exchanger Med temperature)

Heat exchanger

3-way

valve

3-way

valve

Pressure switch

4-way valve

Strainer

Expansion valve

(INDOOR)

Heat exchanger

(OUTDOOR)

Sub accumulator

Compressor

5-1. Models: AOUH18LMAS1 and AOUH24LMAS1

TECHNICAL DATA

AND PARTS LIST

TECHNICAL DATA

AND PARTS LIST

5-1. Models: AOUH18LMAS1 and AOUH24LMAS1 - (02-17) - 5. Refrigerant system diagrams

Page 34

6. Wiring diagrams

6-1. Indoor unit

Models: ASUH18LMAS and ASUH24LMAS

TECHNICAL DATA

AND PARTS LIST

TECHNICAL DATA

AND PARTS LIST

6-1. Indoor unit - (02-18) - 6. →iring diagrams

Page 35

6-2. Outdoor unit

Models: AOUH18LMAS1 and AOUH24LMAS1

TECHNICAL DATA

AND PARTS LIST

TECHNICAL DATA

AND PARTS LIST

6-2. Outdoor unit - (02-19) - 6. →iring diagrams

Page 36

7. PC board diagrams

AWG26 WHITE

AWG26 RED

AWG26 WHITE AWG26 WHITE AWG26 WHITE

AWG26 WHITE AWG26 WHITE

AWG22 WHITE

AWG22 RED

CN13

B07B-PASK-1

WHITE

CN301 B07B-PASK-1

WHITE

CN300

B03B-XNISK-A-1

WHITE

CN1

SM05B-SRSS-TB

WHITE

54321

COMMUNICATION PCB

K16JS-1600HSE-CA0

FLASH

EMI FILTER

ZCAT1518-0730

2 TURNS

REMOTE CONTROLLER ( 2-WIRE )

MAIN PCB 18 model: K20AZ-2002HSE-C1 24 model: K20AZ-2003HSE-C1

DC12V

DC5V

BLACK

BLACK BLACK BLACK

BLACK

CN1

B04B-PLIRK-1

RED

THERMISTOR ( ROOMTEMP. )

THERMISTOR ( PIPE TEMP. )

DC5V-2

CN1 Thermistor Characteristics.

Thermistor

Thermistor ( Pipe temp. )

176.03 k

62.91 k

39.57 k

1.10 V

2.21 V 2.79 V

Thermistor ( Room temp. )

33.62 k

12.54 k

8.04 k

1.15 V

2.22 V 2.77 V

Temperature

CN4

B12B-PASK-1

WHITE

TEST

DC5V

UL1430 AWG26 x 4

WHITE

RED

BLACK

GREEN

CN75

B04B-PAKK-1

BLACK

DC12V-3

( 4 BLACK ) ( 3 GREEN ) ( 2 WHITE ) ( 1 RED )

J2 USB5-A4M2-KNSO-01

WHITE

AWG26 GRAY

AWG26 GRAY AWG26

GRAY

1 2 3 4 5 6 7 8 9 10 11 12

1 2 3

1 21 21 2

1 2

3 4

CN308 B04B-PASK-1

WHITE

CN309

B12B-PASK-1

WHITE

CN314

B3B-XH-AM

WHITE

CN313

B3B-XH-AM

WHITE

CN312

B2B-XH-AM

WHITE

CN311

B2B-XH-AM

WHITE

CN310

B2B-XH-AM

WHITE

UART COMMUNICATION PCB

K14YM-1500HSE-CA0

EX. OUT1 EX. OUT2

EX. OUT3 EX. IN1

EX. IN2

FLASH

AWG26 GRAY

AWG26 GRAY AWG26 GRAY

CN65

B04B-PASK-1

WHITE

DC12V-3

1 2 3 4 5 6 7 8 9 10 11 12

1 2 3

1 21 21 2

1 2

3 4

CN308 B04B-PASK-1

WHITE

CN309

B12B-PASK-1

WHITE

CN314

B3B-XH-AM

WHITE

CN313

B3B-XH-AM

WHITE

CN312

B2B-XH-AM

WHITE

CN311

B2B-XH-AM

WHITE

CN310

B2B-XH-AM

WHITE

COMMUNICATION PCB

K14YM-1500HSE-CA0

EX. OUT1 EX. OUT2

EX. OUT3 EX. IN1

EX. IN2

FLASH

AWG28 WHITE AWG28 WHITE AWG28 WHITE AWG28 WHITE AWG28 WHITE AWG28 WHITE AWG28 WHITE AWG28 WHITE AWG28 WHITE AWG28 WHITE

CN9 B10B-PASK-1

WHITE

CN200

S10B-PASK-2

WHITE

INDICATOR PCB

K18RB-1800HSE-D0

DC12V

DC5V

RED

WHITE

BLACK

YELLOW BLUE

RED

ORANGE YELLOW PINK BLUE

CN5 B5 ( 7-2.3 ) B-XASK-1-A

WHITE

CN7 B05B-PLISK-1

WHITE

LOUVER UP / DOWN

DC FAN MOTOR

DC340V

DC15V

DC12V

CN14 B3 ( 5.0 ) B-XASK-1-A

WHITE

EARTH

AWG22 WHITE

AWG22 BLACK

AWG22 RED

UL1015 AWG16 GREEN

UL1015 AWG20 GREEN

EMI FILTER

ZC7KT 14X8X4

3 TURNS

OUTDOOR UNIT POWER SOURCE AC208-230V 60Hz

SERIAL

TERMINAL

CN47 B2B-XH-AM

WHITE

CN46 B3B-XH-AM

WHITE

EX. IN

EX. OUT

DC12V

DC5V

CONTROL UNIT 18 model: EZ-0200HHSE 24 model: EZ-0200KHSE

CN5 DC Fan motor

Pin No.

Terminal code

GND

Vcc

Vsp

Function of terminal

Revolution pulse output

Speed control voltage input

Control power voltage input

GND

Motor power voltage input

Lead wire color

Red

Black

White

Yellow

Blue

RED

ORANGE YELLOW PINK BLUE

1 2 3 4 5 6

CN8 B06B-PLIRK-1

RED

LOUVER ( RIGHT / LEFT ) M

DC12V

TYPE A OPTION UNIT (WIRELESS LAN ADAPTER)

*Either A or B can be connected.

*Only type B can be connected.

OPTION UNIT (EXTERNAL INPUT AND OUTPUT)

TYPE B OPTION UNIT (EXTERNAL INPUT AND OUTPUT)

OPTION UNIT (2-WIRE REMOTE CONTROLLER)

32℉

68℉86℉

7-1. Models: ASUH18LMAS and ASUH24LMAS

TECHNICAL DATA

AND PARTS LIST

TECHNICAL DATA

AND PARTS LIST

7-1. Models: ASUH18LMAS and ASUH24LMAS - (02-20) - 7. PC board diagrams

Page 37

7-2. Models: AOUH18LMAS1 and AOUH24LMAS1

INVERTER ASSEMBLY 18 model : EZ-02010HUE 24 model : EZ-02010HUE

INDOOR UNIT

POWER SOURCE

1P2W AC208-230V

60Hz

EMI FILTER (A)

GRFC-13

2 TURN

TERMINAL

UL1015 AWG20 GREEN

UL1015 AWG20 BLACK

UL1015 AWG20 WHITE

UL1015 AWG20 RED

UL1015 AWG12 BLACK

UL1015 AWG12 WHITE

EMI FILTER (C)

GRFC-13

2 TURN

EMI FILTER (B)

TRMH-25-15-12E

4 TURN

UL1015 AWG20

GREEN

W102 L-IN

W103 L-IN

P109 E

MAIN PCB 18 model : H18LJTA(U)-A01-00-SV 24 model : H24LJTA(U)-A01-00-SV

TRANSISTOR PCB

18, 24 models : K17PH-2001SUE-TR1-SV

UL1015 AWG12

GREEN

4-WAY VALVE

ELECTTRONIC EXPANTION VALVE.1

4WV

EEV.1

RED

BLUE

ORANGE

YELLOW

WHITE

BLACK

P60 B2P3-VH-B

WHITE

P108 B3 ( 8.0 ) B-PSILE-1

Blue

P106 L-OUT P107 N-OUT

P30 B05B-PLISK-1

WHITE

P710

B12B-PASK-1

WHITE

P350 B04B-XNISK-A-1

WHITE

THERMISTOR ( COMP. TEMP. )

THERMISTOR ( PIPE MID. TEMP. )

THERMISTOR ( OUTDOOR TEMP. )

THERMISTOR ( PIPE OUT TEMP. )

THERMISTOR ( DISCHARGE TEMP. )

MARKING COLOR GRAY

MARKING COLOR RED

BLACK

MARKING COLOR BROWN

P10 B03B-PASK-1

WHITE

P1 B03B-PLIEK-1

BLUE

P15 B04B-PLIRK-1

RED

P5 B03B-PLISK-1

WHITE

P20 B03B-XASK-1-A

WHITE

DC5V-3

DC13V-4

P661

B04B-PASK-1

WHITE

P580

B02B-XAYK-1-A

YELLOW

PA580

B02B-XAMK-1-A

GREEN

P590

B02B-XAKK-1-A

BLACK

PA590

B02B-XAEK-1-A

BLUE

DC13V-3

DC5V-1

A A

EX. IN1

EX. IN2

EX. OUT1

EX. OUT2

EMI FILTER (E)

GRFC-7

3 TURN

EMI FILTER (F)

GRFC-8

2 TURN

EMI FILTER (D)

GRFC-8 1 TURN

UL1015 AWG14 BLACK

UL1015 AWG14 WHITE

UL1430 AWG24 WHITE

UL1430 AWG24

WHITE

UL1430 AWG24 WHITE

UL1430 AWG24

WHITE

W200 L-IN W201 N-IN

W202 RERAY-OUT

W203 DB-IN

DC5V-1

P351 B04B-XNISK-A-1

WHITE

P650 B5 (7-2.3) B-XASK-1-A

WHITE

DC5V-1

DC380V

DC15V-1

UL1430 AWG24

WHITE

UL1430 AWG24

WHITE

UL1430 AWG22

RED

UL1430 AWG22

BLACK

UL1430 AWG22

WHITE

UL1430 AWG22

YELLOW

UL1430 AWG22

BROWN

BLACK

UL1430 AWG22

WHITE

UL1430 AWG22

WHITE

BLACK

WHITE

YELLOW

BROWN

RED

DC FAN MOTOR

SW1

PRESSURE SWITCH 1 HIGH PRESSURE

EMI FILTER (G)

ZCAT2132-1130

1 TURN

COMPRESSOR

COMP

P400 U

P401 V

P402 W

UL3271 AWG12

RED

UL3271 AWG12 WHITE

UL3271 AWG12 BLACK

HEATSINK-THERMISTOR

UL3271 AWG14

RED

FLASH

P600 B128-PASK-1

WHITE

DC13V-3DC13V-3

P660 B05B-PASK-1

WHITE

DC5V-3

DC13V-4

P662 B05B-PASK-1

WHITE

P663 B04B-PASK-1

WHITE

P700 B03B-XAKK-1-A

BLACK

P770 B03B-XNISK-A-1

WHITE

3 4 5

Pin No.

Terminal code

GND

Vcc Vsp

Function of terminal

Revolution pulse output

Speed control voltage input

Control power voltage input

GND

Motor power voltage input

Lead wire color

Red

Black

White Yellow Brown

P650 DC Fan Motor

U-V

V-W

U-W

1.160

(20 )

DC Resistance 1,970

(20 )

EXPANSION VALVE COIL 1

1(Red) - 2(Blue)

1(Red) - 3(Orange)

1(Red) - 4(Yellow)

1(Red) - 5(White)

P30 Expansion Valve Coil

46.0

(20 )

Recommended Drive Condition Unipolar Drive, 1-2 Phase Excitation.

Coil resistance

A WHITE

COM RED

A ORANGE

COM

RED

YELLOW

Connector terminal No.

2 1

Lead wire color

White

Yellow

Orange

Blue Red

Phase

COM(+)

Off

OffOff

Off Off

Off

OnOnOn

OnOn On

On On On

On On

1 2 3 4 5 6 7 8

Excitation state

Excitation order (1-2 phase excitation )

Valve operation

BLUE

P30 ELECTTRONIC EXPANTION VALVE COIL

P10 Thermistor Characteristics.

Thermistor

Thermistor ( Compressor temp. )

168.60 k

0.36 V

Temperature

62.55 k

0.86 V

40.01 k

1.23 V

P1 Thermistor Characteristics.

Thermistor

Thermistor ( Pipe-mid. temp. )

16.05 k

1.14 V

Temperature

5.98 k

2.21 V

3.84 k

2.77 V

P15 Thermistor Characteristics.

Thermistor ( Discharge temp. )

168.60 k

62.55 k

40.01 k

0.36 V

0.86 V 1.23 V

Thermistor ( Pipe-out temp. )

16.05 k

5.98 k

3.84 k

1.14 V

2.21 V 2.77 V

Thermistor

Temperature

P5 Thermistor Characteristics.

Thermistor

Thermistor ( Outdoor temp. )

35.21 k

2.61 V

Temperature

12.64 k

3.76 V

7.97 k

4.14 V

Type of contact

Characteristics of pressure switch

Pressure

Contact : Short Open

Contact : Open Short

4.2 ~ 4.05MPa

3.2 ± 0.15MPa

P770 HIGH PRESSURE SWITCH

P700 Thermistor Characteristics.

Thermistor ( Heatsink temp. )

15.83 k

5.90 k

3.78 k

0.43 V

1.01 V 1.42 V

Thermistor

Temperature

32℉68℉86℉

TECHNICAL DATA

AND PARTS LIST

7-2. Models: AOUH18LMAS1 and AOUH24LMAS1 - (02-21) - 7. PC board diagrams

TECHNICAL DATA

AND PARTS LIST

Page 38

TECHNICAL DATA

AND PARTS LIST

7-2. Models: AOUH18LMAS1 and AOUH24LMAS1 - (02-22) - 7. PC board diagrams

Page 39

3. TROUBLESHOOTING

SR_CH03_AS052EF_01

2021.11.17

Page 40

CONTENTS

3. TROUBLESHOOTING

1. Error code ....................................................................................................03-1

1-1. How to check the error memory......................................................................................03-1

1-2. How to erase the error memory......................................................................................03-1

1-3. Error code table (Indoor unit and wired remote controller)..............................................03-2

1-4. Error code table (Outdoor unit).......................................................................................03-4

1-5. Error code table (→ireless LAN indicator).......................................................................03-6

1-6. Error code table (Mobile app) .........................................................................................03-7

1-7. Error message for wireless LAN control (Mobile app).....................................................03-9

2. Troubleshooting with error code .............................................................03-13

2-1. E: 11.↓. Serial communication error (Serial reverse transfer error) (Outdoor unit) .......03-13

2-2. E: 11.↓. Serial communication error (Serial forward transfer error) (Indoor unit)..........03-15

2-3. E: 12.↓. →ired remote controller communication error (Indoor unit).............................03-17

2-4. E: 18.↓. External communication error (Indoor unit).....................................................03-18

2-5. E: 23.↓. Combination error (Outdoor unit) ....................................................................03-19

2-6. E: 26.↓. Address setting error in wired remote controller (Indoor unit) .........................03-20

2-7. E: 29.↓. Connected unit number error (Indoor unit)......................................................03-21

2-8. E: 32.↓. Indoor unit main PCB error (Indoor unit).........................................................03-22

2-9. E: 35.↓. MANUAL AUTO button error (Indoor unit) ......................................................03-23

2-10. E: 3A.↓. Indoor unit communication circuit error (Indoor unit).....................................03-24

2-11. E: 41.↓. Room temperature sensor error (Indoor unit)................................................03-26

2-12. E: 42.↓. Indoor unit heat exchanger sensor error (Indoor unit)...................................03-27

2-13. E: 51.↓. Indoor unit fan motor error (Indoor unit)........................................................03-28

2-14. E: 58.↓. Intake grille error (Indoor unit).......................................................................03-29

2-15. E: 62.↓. Outdoor unit main PCB error (Outdoor unit)..................................................03-30

2-16. E: 63.↓. Inverter error (Outdoor unit) ..........................................................................03-31

2-17. E: 64.↓. PFC circuit error (Outdoor unit).....................................................................03-32

2-18. E: 65.↓. Trip terminal L error (Outdoor unit) ...............................................................03-33

2-19. E: 71.↓. Discharge thermistor error (Outdoor unit) .....................................................03-34

2-20. E: 73.↓. Heat exchanger (Middle/Outlet) temperature thermistor error (Outdoor unit).........

......................................................................................................................................03-35

2-21. E: 74.↓. Outdoor temperature thermistor error (Outdoor unit) ....................................03-36

2-22. E: 77.↓. Heat sink thermistor error (Outdoor unit).......................................................03-37

2-23. E: 84.↓. Current sensor error (Outdoor unit)...............................................................03-38

2-24. E: 86.↓. High pressure switch error (Outdoor unit).....................................................03-39

2-25. E: 86.↓. Pressure sensor error (Outdoor unit) ............................................................03-40

2-26. E: 94.↓. Trip detection (Outdoor unit) .........................................................................03-41

2-27. E: 95.↓. Compressor motor control error (Outdoor unit) .............................................03-42

2-28. E: 97.↓. Outdoor unit fan motor error (Outdoor unit)...................................................03-43

2-29. E: 99.↓. 4-way valve error (Outdoor unit) ...................................................................03-45

2-30. E: A1.↓. Discharge temperature error (Outdoor unit)..................................................03-47

2-31. E: A5.↓. Low pressure error (Outdoor unit) ................................................................03-49

2-32. E: AC.↓. Heat sink temperature error (Outdoor unit) ..................................................03-51

Page 41

CONTENTS (continued)

3. Troubleshooting without error code........................................................03-52

3-1. Indoor unit—No power..................................................................................................03-52

3-2. Outdoor unit—No power...............................................................................................03-53

3-3. No operation (Power is on)...........................................................................................03-54

3-4. No cooling/No heating ..................................................................................................03-55

3-5. Abnormal noise.............................................................................................................03-57

3-6. →ater leaking................................................................................................................03-58

3-7. Too warm .....................................................................................................................03-59

3-8. Too cool........................................................................................................................03-63

4. Troubleshooting with error code (For wireless LAN adapter)...............03-67

4-1. E: 18.↓. External communication error between indoor unit and →LAN adapter..........03-67

4-2. →ireless LAN adapter error ..........................................................................................03-68

4-3. Network communication error between wireless LAN router and →LAN adapter.........03-69

4-4. E: 18.↓. Communication error ......................................................................................03-71

4-5. E: 18.↓. →ireless LAN adapter non-energized .............................................................03-73

4-6. →ireless LAN adapter Sleep mode (Indoor unit) ..........................................................03-74

4-7. Mobile app setting method............................................................................................03-75

5. Service parts information .........................................................................03-80

5-1. Compressor..................................................................................................................03-80

5-2. Inverter compressor......................................................................................................03-81

5-3. Outdoor unit Electronic Expansion Valve (EEV) .........................................................03-82

5-4. Indoor unit fan motor ....................................................................................................03-84

5-5. Outdoor unit fan motor ................................................................................................03-85

5-6. Pressure switch ..........................................................................................................03-86

5-7. 4-way valve coil (solenoid coil)/4-way valve ...............................................................03-87

6. Thermistor resistance values...................................................................03-88

6-1. Indoor unit ....................................................................................................................03-88

6-2. Outdoor unit..................................................................................................................03-89

Page 42

Page 43

1. Error code

Error memory display

2 minutes 20 seconds

Starting operation and then;

- Press TEST RUN button on the remote controller. or

- Press MANUAL AUTO button on the indoor unit for 10 seconds or more.

In case of “No memorized error display” , TEST RUN display will be shown.

Turning on the power supply

→hen a problem occurs in the system or the connected device, the error content is notified by displaying the code.

NOTE: This function is only available in a system with indoor or IR receiver units equipped with

LED lamps to indicate the error content.

Errors, once displayed, will be automatically stored in the PC board of the indoor unit. Even if the power is disconnected, the memory containing the error history will not be erased.

If another error occurs later, the stored error memory will be updated automatically and replaced with the new one. (Previous error will be erased.)

1-1. How to check the error memory

TROUBLESHOOTING

→hen an error occurs, the operation lamp (Green) and the timer lamp (Orange) indicate the error

TROUBLESHOOTING

content by blinking. To check the error memory, follow the procedures below.

1. Stop the operation of the air conditioner, and then disconnect the power supply.

2. Reconnect the power supply.

3. In one of the following two methods, the memorized error is only displayed during the “3 minutes ST”* state period.

• Start the operation and then press the TEST RUN button on the remote controller.

• Press the MANUAL AUTO button on the indoor unit for 10 seconds or more.

*: The “3 minutes ST” period lasts 2 minutes and 20 seconds after turning on the power supply.

1-2. How to erase the error memory

The error memory can be erased in one of the following two methods.

• Manual erase: Pressing the MANUAL AUTO button on the indoor unit while the “Error memory display” is being shown. (Short beep emits for about 3 seconds.)

• Automatic erase: After continuing the normal operation of the air conditioner without error for 2 hours or longer after displaying the error memory as described in How to check the error memory. (Except FAN operation mode.)

1-1. How to check the error memory - (03-1) - 1. Error code

Page 44

1-3. Error code table (Indoor unit and wired remote controller)

The operation, timer, and economy indicators operate according to the error contents. For confirmation of the error contents, refer the flashing pattern as follows.

Indoor unit display Wired

Error contents

E: 11.↓. Serial communication error (Serial reverse transfer error) (Outdoor unit)

E: 11.↓. Serial communication error (Serial forward transfer error) (Indoor unit)

E: 12.↓. →ired remote controller communication error (Indoor unit)

E: 18.↓. External communication error

TROUBLESHOOTING

(Indoor unit) E: 18.↓. External communication error

between indoor unit and →LAN adapter E: 18.↓. Communication error 1 times 8 times Continuous 18 E: 18.↓. →ireless LAN adapter non-

energized E: 23.↓. Combination error (Outdoor unit) 2 times 3 times Continuous 23 E: 26.↓. Address setting error in wired

remote controller (Indoor unit) E: 29.↓. Connected unit number error

(Indoor unit) E: 32.↓. Indoor unit main PCB error (Indoor

unit) E: 35.↓. MANUAL AUTO button error

(Indoor unit) E: 3A.↓. Indoor unit communication circuit

error (Indoor unit) E: 41.↓. Room temperature sensor error

(Indoor unit) E: 42.↓. Indoor unit heat exchanger sensor

error (Indoor unit) E: 51.↓. Indoor unit fan motor error (Indoor

unit) E: 58.↓. Intake grille error (Indoor unit) 5 times 8 times Continuous 58 E: 62.↓. Outdoor unit main PCB error

(Outdoor unit) E: 63.↓. Inverter error (Outdoor unit) 6 times 3 times Continuous 63 E: 64.↓. PFC circuit error (Outdoor unit) 6 times 4 times Continuous 64 E: 65.↓. Trip terminal L error (Outdoor unit) 6 times 5 times Continuous 65 E: 71.↓. Discharge thermistor error

(Outdoor unit) E: 73.↓. Heat exchanger (Middle/Outlet)

temperature thermistor error (Outdoor unit) E: 74.↓. Outdoor temperature thermistor

error (Outdoor unit) E: 77.↓. Heat sink thermistor error (Outdoor

unit) E: 84.↓. Current sensor error (Outdoor unit) 8 times 4 times Continuous 84 E: 86.↓. High pressure switch error

(Outdoor unit) E: 86.↓. Pressure sensor error (Outdoor

unit) E: 94.↓. Trip detection (Outdoor unit) 9 times 4 times Continuous 94

Operation [ ]

(Green)

1 times 1 times Continuous 11

1 times 2 times Continuous 12

1 times 8 times Continuous 18

2 times 6 times Continuous 26

2 times 9 times Continuous 29

3 times 2 times Continuous 32

3 times 5 times Continuous 35

3 times 10 times Continuous 3A

4 times 1 times Continuous 41

4 times 2 times Continuous 42

5 times 1 times Continuous 51

6 times 2 times Continuous 62

7 times 1 times Continuous 71

7 times 3 times Continuous 73

7 times 4 times Continuous 74

7 times 7 times Continuous 77

8 times 6 times Continuous 86

Timer [

(Orange)

]

Economy [ ]

(Green)

remote

controller

display

TROUBLESHOOTING

1-3. Error code table (Indoor unit and wired remote controller) - (03-2) - 1. Error code

Page 45

Indoor unit display Wired

Error contents

E: 95.↓. Compressor motor control error (Outdoor unit)

E: 97.↓. Outdoor unit fan motor error (Outdoor unit)

Operation [ ]

(Green)

Timer [

(Orange)

]

Economy [

(Green)

9 times 5 times Continuous 95

9 times 7 times Continuous 97

]

remote

controller

display

E: 99.↓. 4-way valve error (Outdoor unit) 9 times 9 times Continuous 99 E: A1.↓. Discharge temperature error

(Outdoor unit)

10 times 1 times Continuous A1

E: A5.↓. Low pressure error (Outdoor unit) 10 times 5 times Continuous A5 E: AC.↓. Heat sink temperature error

(Outdoor unit)

10 times 12 times Continuous AC

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1-3. Error code table (Indoor unit and wired remote controller) - (03-3) - 1. Error code

Page 46

1-4. Error code table (Outdoor unit)

The operation status is determined by the lighting up and blinking of the LED lamp. After check that ERROR LED lamp blinks, press the ENTER button once.

NOTE: For the positions of LED lamp and buttons, refer to "Function settings (for outdoor unit)" in

Chapter 5. FIELD →ORK.

Error contents

E: 11.↓. Serial communication error (Serial forward transfer error) (Indoor unit)

(Occurs immediately after starting operation)

TROUBLESHOOTING

E: 11.↓. Serial communication error (Serial forward transfer error) (Indoor unit)

(Occurs during operation)

E: 12.↓. →ired remote controller communication error (Indoor unit)

E: 18.↓. External communication error (Indoor unit)

E: 23.↓. Combination error (Outdoor unit)

E: 26.↓. Address setting error in wired remote controller (Indoor unit)

E: 29.↓. Connected unit number error (Indoor unit)

E: 32.↓. Indoor unit main PCB error (Indoor unit)

E: 35.↓. MANUAL AUTO button error (Indoor unit)

E: 3A.↓. Indoor unit communication circuit error (Indoor unit)

E: 41.↓. Room temperature sensor error (Indoor unit)

E: 42.↓. Indoor unit heat exchanger sensor error (Indoor unit)

E: 51.↓. Indoor unit fan motor error (Indoor unit)

E: 62.↓. Outdoor unit main PCB error (Outdoor unit)

E: 63.↓. Inverter error (Outdoor unit)

E: 65.↓. Trip terminal L error (Outdoor unit)

E: 71.↓. Discharge thermistor error (Outdoor unit)

E: 73.↓. Heat exchanger (Middle/Outlet) temperature thermistor error (Outdoor unit)

E: 74.↓. Outdoor temperature thermistor error (Outdoor unit)

E: 77.↓. Heat sink thermistor error (Outdoor unit)

E: 84.↓. Current sensor error (Outdoor unit)

E: 86.↓. High pressure switch error (Outdoor unit)

POWER/

MODE

■

ERROR

● ■

PUMP

DOWN

L1 L2 L3 L4 L5 L6

LOW NOISE PEAK CUT

■

○ ○ ● ●

○ ● ○ ○

○ ○ ○ ●

○ ○ ● ●

○ ○ ○ ●

○ ○ ● ○

○ ○ ○ ●

○ ● ● ○

TROUBLESHOOTING

1-4. Error code table (Outdoor unit) - (03-4) - 1. Error code

Page 47

Error contents

E: 86.↓. Pressure sensor error (Outdoor unit)

E: 94.↓. Trip detection (Outdoor unit)

E: 95.↓. Compressor motor control error (Outdoor unit)

E: 97.↓. Outdoor unit fan motor error (Outdoor unit)

E: 99.↓. 4-way valve error (Outdoor unit)

E: A1.↓. Discharge temperature error (Outdoor unit)

E: A5.↓. Low pressure error (Outdoor

TROUBLESHOOTING

unit) E: AC.↓. Heat sink temperature error

(Outdoor unit)

POWER/

MODE

■

ERROR

● ■

PUMP

DOWN

L1 L2 L3 L4 L5 L6

LOW NOISE PEAK CUT

■

○ ● ● ○

○ ○ ○ ●

○ ○ ● ●

○ ○ ○ ●

○ ○ ● ●

TROUBLESHOOTING

: Light on

●

: Light off

○

(n) : n Times blinking

■

1-4. Error code table (Outdoor unit) - (03-5) - 1. Error code

Page 48

1-5. Error code table (Wireless LAN indicator)

Internet

Indoor unit

Controller PCB

Parts:

WLAN adapter

Cloud

Mobile app

(Smart device)

Wireless

LAN

router

Outdoor unit

Wireless LAN label

Connection port

MAC: SSID: AP-WF PIN:

Wireless LAN adapter

• →ireless LAN control system diagram example

• Name of parts

TROUBLESHOOTING

• →ireless LAN indicator For confirmation of the error contents, refer the flashing pattern as follows.

→ireless LAN LED (orange) on the indoor unit operate according to the error contents.

Error contents Wireless LAN LED (orange) Error code

On: Connection information with router is

E: 18.↓. External communication error between indoor unit and →LAN adapter

Off: Connection information with router is

available

unavailable

→ireless LAN adapter error Flashing slow No error Network communication error between

wireless LAN router and →LAN adapter

On No error

E: 18.↓. Communication error Flashing slow 18 E: 18.↓. →ireless LAN adapter non-

energized →ireless LAN adapter Sleep mode

(Indoor unit)

Off 18

Off No error

Flashing slow: Repeating 7 seconds on/2 seconds off

1-5. Error code table (→ireless LAN indicator) - (03-6) - 1. Error code

Page 49

1-6. Error code table (Mobile app)

Error Name

Error button

Error code

Error Name

Error code

Error button

• Error display

If there is an abnormality on the air conditioning, refer to

→hen the

(error button) on the home screen is tapped, error code and error name is displayed.

as follows.

– For Android

TROUBLESHOOTING

– For iOS

1-6. Error code table (Mobile app) - (03-7) - 1. Error code

Page 50

• Error code

Error message Error contents Error code

Serial communication error (Serial Reverse Transfer Error)

Serial communication error (Serial Forward Transfer Error)

→ired remote controller communication error

Indoor unit PCB model information error

Manual auto switch error

Room temp. sensor error

Indoor unit Heat Ex. Middle temp. sensor

TROUBLESHOOTING

error

Indoor unit fan motor error

Outdoor unit main PCB model information error

E: 11.↓. Serial communication error (Serial reverse transfer error) (Outdoor unit)

E: 11.↓. Serial communication error (Serial forward transfer error) (Indoor unit)

E: 12.↓. →ired remote controller communication error (Indoor unit)

E: 32.↓. Indoor unit main PCB error (Indoor unit)

E: 35.↓. MANUAL AUTO button error (Indoor unit)

E: 41.↓. Room temperature sensor error (Indoor unit)

E: 42.↓. Indoor unit heat exchanger sensor error (Indoor unit)

E: 51.↓. Indoor unit fan motor error (Indoor unit)

E: 62.↓. Outdoor unit main PCB error (Outdoor unit)

Inverter error E: 63.↓. Inverter error (Outdoor unit)

PC circuit error E: 64.↓. PFC circuit error (Outdoor unit)

Discharge temp. sensor error

Outdoor temp. sensor error

E: 71.↓. Discharge thermistor error (Outdoor unit)

E: 74.↓. Outdoor temperature thermistor

error (Outdoor unit)

Current sensor error E: 84.↓. Current sensor error (Outdoor unit) 84.1 Trip detection E: 94.↓. Trip detection (Outdoor unit) 94.1

Compressor rotor position detection error

Outdoor unit fan motor error

E: 95.↓. Compressor motor control error

(Outdoor unit)

E: 97.↓. Outdoor unit fan motor error

(Outdoor unit)

4-way valve error E: 99.↓. 4-way valve error (Outdoor unit) 99.1

Discharge temp. error

E: A1.↓. Discharge temperature error

(Outdoor unit)

11.1

11.2

11.3

11.4

12.1

32.1

35.1

41.1

42.2

51.1

51.2

62.1

62.2

63.1

63.2

64.1

64.3

64.4

64.8

71.1

74.1

95.1

95.3

97.3

A1.1

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1-6. Error code table (Mobile app) - (03-8) - 1. Error code

Page 51

1-7. Error message for wireless LAN control (Mobile app)

Error message

For Android For iOS

• Error display If there is an abnormality on the wireless control system, refer to error messages as follows.

The error message disappears after 5 seconds and the normal screen is displayed.

TROUBLESHOOTING

1-7. Error message for wireless LAN control (Mobile app) - (03-9) - 1. Error code

Page 52

• Error message list

– For Android

Registration error

Error message Cause Solution

→i-Fi must be enabled to set up new device

→e weren’t able to sign you onto null. Please goto the →iFi settings and join the network from there. Return to the app when you’re done.

Could not connect to the device at this time. Please reset the device and try again.

TROUBLESHOOTING

The device failed to connect with service.

Could not register the device. Make sure the device is ready for registration.

Please ensure your air conditioner is ready to pair, and that you have entered its SSID and password correctly.

The user has disabled →i-Fi

Enable the →i-Fi on the smart device.

on the smart device. The smart device and air

conditioner are connected to difference →i-Fi networks

Connect the mobile device to the same network as air conditioner, then retry the registration.

when attempting to register.

The air conditioner is not connected to →i-Fi.

Check if the router connected to the air conditioner has internet access. (↔ou can check by connecting the smart device to the router, then opening the website.) If there is no access, connect the router to the internet.

Smart device is not connected to the same network as the air

Connect the mobile device to the same network as the air conditioner, then retry the registration.

conditioner. ↔our internet access may be

down or a firewall may be blocking requests to the service.

The air conditioner is not connected to the router.

Enter the →i-Fi setting on the smart device, then check if the SSID of the air conditioner (AP-→F) is connected. If the air conditioner is connected, retry the registration.

The router the air conditioner is connected to, has no internet access.

The air conditioner is already registered.

If there is a smart device that has already been registered to the air conditioner, unregister by using the registered smart device. Retry the registration with the smart device you wish to register. If you do not own the smart device registered to the air conditioner (lost, property of previous owner, etc.), ask your maker service to unregister the smart device. Notify the MAC address of the →LAN adapter as written on the →ireless LAN label.

If the problem persists even if the all of the above is conducted, please contact your dealer or authorized service personnel. →hen asking for advice, Notify the MAC address of the →LAN adapter as written on the →ireless LAN label.

Occurs when pairing is executed, when the user erroneously enter the SSID

Enter the SSID literally. (Uppercase and lowercase letters also match)

of the adapter.

TROUBLESHOOTING

1-7. Error message for wireless LAN control (Mobile app) - (03-10) - 1. Error code

Page 53

General error

Error message Cause Solution

No connectivity to →i-Fi or the cloud. Please check your

The smart device has no internet access.

Connect the mobile device to the internet.

network connection. An error occurred while trying

to update your profile. Please try again later.

Device is offline and cannot be modified.

The router the air conditioner is connected to, has no internet access.

Check if the router connected to the air conditioner has internet access. (↔ou can check by connecting the mobile device to the router, then opening the website.) If there is no access, connect the router to the internet.

The air conditioner is not connected to the router.

TROUBLESHOOTING

Check the →-LAN LED indicators on the air conditioner. If the →-LAN LED lamp is flashing or off, refer to "Error code table

TROUBLESHOOTING

(→ireless LAN indicator)" on page 03-6

Error message Cause Solution

Could not reach service. The smart device has no

Connect the smart device to the internet.

internet access.

– For iOS

Error message Cause Solution

↔ou need an internet connection to add new devices.

Could not register same LAN device. Make sure both devices are in the same LAN and try again to register.

No registrable device was found. Make sure →i-Fi setup was successful. This method only works if the →i-Fi was recently performed.

Could not register the device. Make sure the device is ready for registration.

Registration error

The user has disabled →i-Fi on their smart device.

The smart device and air conditioner are connected to different →i-Fi networks when attempting to register.

The air conditioner is not connected to →i-Fi.

Smart device is not connected to the same network as the air conditioner.

The air conditioner is not connected to the router.

Enable →i-Fi from the iOS setting.

Connect the smart device to the same network as the air conditioner, then retry the registration.

Connect the mobile device to the same network as the air conditioner, then tap register button.

1-7. Error message for wireless LAN control (Mobile app) - (03-11) - 1. Error code

Page 54

Registration error

Error message Cause Solution

Could not register the device. Make sure the device is ready for registration.

The router the air conditioner is connected to, has no internet access.

The air conditioner is already registered.

TROUBLESHOOTING

unregister the smart device. Notify the MAC address of the →LAN adapter as

TROUBLESHOOTING

written on the →ireless LAN label.

If the problem persists even if the all of the above is conducted, please contact your dealer or authorized service personnel. →hen asking for advice, please notify the MAC address of the →LAN adapter as written on the →ireless LAN label.

Please ensure your air conditioner is ready to pair, and that you have entered its SSID and password correctly.

Occurs when pairing is executed, when the user erroneously enter the SSID of the adapter.

Enter the SSID literally. (Uppercase and lowercase letters also match)

General error

Error message Cause Solution

Failed to change password. The smart device has no Cloud not determine service

internet access. reachability. Failed to update property. Could not retrieve schedules. The operation couldn’t be

completed. Operation timed out.

The router the air conditioner

“Device name” is offline. (Device name varies

is connected to has no

internet access.

depending on the air conditioner)

The air conditioner is not

connected to the router.

Connect the mobile device to the internet.

Check if the router connected to the air conditioner has internet access. (↔ou can check by connecting the mobile device to the router, then opening the website to check access.) If there is no access, connect the router to the internet.

Check the →-LAN LED indicators on the air conditioner. If the →-LAN LED lamp is flashing or off, refer to "Error code table

(→ireless LAN indicator)" on page 03-6

Error message Cause Solution

Could not reach service. The smart device has no

Connect the smart device to the internet.

internet access.

1-7. Error message for wireless LAN control (Mobile app) - (03-12) - 1. Error code

Page 55

2. Troubleshooting with error code

2-1. E: 11.X. Serial communication error (Serial reverse transfer

error) (Outdoor unit)

Operation indicator 1 time flash

Indicator

Detective actuator Outdoor unit

TROUBLESHOOTING

Forecast of cause

Indoor unit

outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4

Check point 1. Reset the power and operate

Timer indicator 1 time flash Economy indicator Continuous flash Error code E: 11

Main PCB →hen the indoor unit cannot receive the serial signal

from outdoor unit more than 2 minutes after power on,

Fan motor

or the indoor unit cannot receive the serial signal more than 15 seconds during normal operation.

Connection failure

External cause

Main PCB failure

Outdoor unit fan motor failure

TROUBLESHOOTING

Does error indication show again?  If no, go to "Check point 1-2".



Check point 2. Check connection

Check any loose or removed connection line of indoor unit and outdoor unit. Check connection condition is control unit. (If there is loose connector, open cable or mis-wiring.)  If there is an abnormal condition, correct it by referring to the installation manual or the “DESIGN

& TECHNICAL MANUAL”.



Check point 3. Check the voltage of power supply

Check the voltage of power supply Check if AC 187 V (AC 208 V -10%) to AC 253 V (AC 230 V +10%) appears at

outdoor unit terminal L—N.



2-1. E: 11.↓. Serial communication error (Serial reverse transfer error) (Outdoor unit) - (03-13) - 2. Troubleshooting with error code

Page 56

Check point 4. Check serial signal (Reverse transfer signal)

RED

WHITE

BLACK

WHITE

GREEN

Check serial signal (Reverse transfer signal)

• Check if indicated value swings between AC 90 V and AC 270 V at the outdoor unit terminal 1 —3.

• If it is abnormal, check the parts below.

– Outdoor unit fan motor in "Service parts information" on page 03-80

TROUBLESHOOTING

• If outdoor fan motor is abnormal, replace outdoor unit fan motor and main PCB.

• If the checked parts are normal, replace the main PCB.

TROUBLESHOOTING



End

Check point 1-2. Check external cause such as noise

• Check the complete insulation of the grounding.

• Check if there is any equipment that causes harmonic wave near the power cable (Neon light bulb or any electronic equipment which causes harmonic wave).



End

2-1. E: 11.↓. Serial communication error (Serial reverse transfer error) (Outdoor unit) - (03-14) - 2. Troubleshooting with error code

Page 57

2-2. E: 11.X. Serial communication error (Serial forward transfer

error) (Indoor unit)

Operation indicator 1 time flash

Indicator

Detective actuator Indoor unit

Forecast of cause

TROUBLESHOOTING

Indoor unit

Outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4

Check point 1. Reset the power and operate

Does error indication show again?  If no, go to "Check point 1-2".

Timer indicator 1 time flash Economy indicator Continuous flash Error code E: 11

Main PCB →hen the indoor unit cannot receive the serial signal

from outdoor unit more than 2 minutes after power on,

Fan motor

or the indoor unit cannot receive the serial signal more than 15 seconds during normal operation.

Connection failure

External cause

Main PCB failure

Indoor unit fan motor failure

TROUBLESHOOTING



Check point 2. Check connection

& TECHNICAL MANUAL.



Check point 3. Check the voltage of power supply

Check the voltage of power supply Check if AC 187 V (AC 208 V -10%) to AC 253 V (AC 230 V +10%) appears at

outdoor unit terminal L—N.



2-2. E: 11.↓. Serial communication error (Serial forward transfer error) (Indoor unit) - (03-15) - 2. Troubleshooting with error code

Page 58

Check point 4. Check serial signal (reverse transfer signal)

RED

WHITE

BLACK

WHITE

GREEN

Check serial signal (Forward transfer signal)

• Check if indicated value swings between AC 30 V and AC 130 V at outdoor unit terminal 2—3.

• If it is abnormal, replace main PCB.

• If it is abnormal, check indoor unit fan motor. (Indoor unit fan motor in "Service parts informa-

tion" on page 03-80)

TROUBLESHOOTING

• If indoor unit fan motor is abnormal, replace indoor unit fan motor and main PCB.

TROUBLESHOOTING



End

Check point 1-2. Check external cause such as noise

• Check the complete insulation of the grounding.

• Check if there is any equipment that causes harmonic wave near the power cable (Neon light bulb or any electronic equipment which causes harmonic wave).



End

2-2. E: 11.↓. Serial communication error (Serial forward transfer error) (Indoor unit) - (03-16) - 2. Troubleshooting with error code

Page 59

2-3. E: 12.X. Wired remote controller communication error

(Indoor unit)

Operation indicator 1 time flash Timer indicator 2 time flash Economy indicator Continuous flash Error code E: 12

→ired remote controller more than 1 minute during normal operation.

Terminal connection abnormal

→ired remote control failure

Main PCB failure

Indicator

Detective actuator

Forecast of cause

Indoor unit

outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 Indoor unit Main PCB →hen the indoor unit cannot receive the signal from

→ired remote control

TROUBLESHOOTING

Check point 1. Check the connection of terminal

After turning off the power, check & correct the followings.

• Check the connection of terminal between remote controller and indoor unit, and check if there is a disconnection of the cable.



Check point 2. Check connection

Check voltage at CN2 (terminal 1—3) of UT↔-T→R↓Z2 (Communication kit) (for 18 model). Check voltage at CN12 of main PCB (terminal 1—2) (for 24 model). (Power supply to the remote controller)

Upon correcting the removed connec-

• If it is DC 5 V (for 18 model) or DC 12 V (for 24 model), remote controller is failure. (Main PCB is normal)

– Replace Remote Control

• If it is DC 0 V, main PCB is failure. (Check remote controller once again)

– Replace main PCB

tor or mis-wiring, reset the power.



End

2-3. E: 12.↓. →ired remote controller communication error (Indoor unit) - (03-17) - 2. Troubleshooting with error code

Page 60

2-4. E: 18.X. External communication error (Indoor unit)

Operation indicator 1 time flash

Indicator

Detective actuator Indoor unit

Forecast of cause

Indoor unit

outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4

Check point 1. Check the connection

TROUBLESHOOTING

• Check any loose or removed connection between the main PCB to the →AN adapter.

-> If there is an abnormal condition, correct it by refer to the installation manual or the “DESIGN & TECHNICAL MANUAL”.

• Check the connection condition on the →LAN adapter and the main PCB (If there is loose connector, open cable or mis-wiring.)

Timer indicator 8 time flash Economy indicator Continuous flash Error code E: 18

External communication error

After receiving a signal from the external input and output PCB, the same signal has not been received for 15 seconds.

Connection failure

→LAN adapter failure

Main PCB

TROUBLESHOOTING



Check point 2. Replace the →LAN adapter

If check point 1 do not improve the symptom, change →LAN adapter.



Check point 3. Replace main PCB

If check point 2 do not improve the symptom, change main PCB



End

2-4. E: 18.↓. External communication error (Indoor unit) - (03-18) - 2. Troubleshooting with error code

Page 61

2-5. E: 23.X. Combination error (Outdoor unit)

Operation indicator 2 time flash

Indicator

Detective actuator Indoor unit

Forecast of cause Incorrect indoor unit is selected.

Indoor unit

Outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4

Check point 1. Check the type of indoor unit

• Check the type of the connected indoor unit.

-> If there is an abnormal condition, correct it by refer to the installation manual or the “DESIGN

TROUBLESHOOTING

& TECHNICAL MANAL”.



Check point 2. Replace main PCB

If check point 1 do not improve the symptom, replace main PCB of the outdoor unit.

Timer indicator 3 time flash Economy indicator Continuous flash Error code E: 23

The outdoor unit receives the serial signal of applied refrigerant information from indoor unit.

TROUBLESHOOTING



End

2-5. E: 23.↓. Combination error (Outdoor unit) - (03-19) - 2. Troubleshooting with error code

Page 62

2-6. E: 26.X. Address setting error in wired remote controller

(Indoor unit)

Operation indicator 2 time flash

Indicator

Detective actuator

TROUBLESHOOTING

Forecast of cause

Indoor unit

outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 →ired remote controller (2-wire) • →hen the address number set by auto setting and

Indoor unit controller PCB

Check point 1. →ire installation

• Check the wire connection in the remote controller group (For installation method, refer to installation manual)

-> If there is an abnormal condition, correct it by refer to the installation manual or the “DESIGN & TECHNICAL MANUAL”.

Timer indicator 6 time flash Economy indicator Continuous flash Error code E: 26

manual setting are mixed in one remote controller group

• →hen the duplicated address number exists in one remote controller group

→rong wiring of remote controller group →rong remote controller address setting

Indoor unit main PCB failure

Remote controller failure

TROUBLESHOOTING



Check point 2. →rong remote controller group setting

• The given address number by auto setting (00) and the manual set number (except 00) are not existing in one remote controller group.

• The remote controller address setting by UI is not existing same address.

• The duplicate address number is not existing in one remote controller group.



Check point 3. Check indoor unit main PCB

• Check if main PCB is damaged.

• Change main PCB and check the error after setting remote controller address.



End

2-6. E: 26.↓. Address setting error in wired remote controller (Indoor unit) - (03-20) - 2. Troubleshooting with error code

Page 63

2-7. E: 29.X. Connected unit number error (Indoor unit)

Operation indicator 2 time flash Timer indicator 9 time flash Economy indicator Continuous flash Error code E: 29

→hen the number of the connected indoor unit exceeds the limitation.

→rong wiring of indoor unit or remote controller

Number of indoor unit or remote controller in remote

controller group

Indoor unit main PCB failure

Indicator

Detective actuator

Forecast of cause

Indoor unit

outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 →ired remote controller (2-wire) Indoor unit main PCB

TROUBLESHOOTING

• →rong number of connected indoor unit

-> If there is an abnormal condition, correct it by refer to the installation manual or the “DESIGN & TECHNICAL MANUAL”.



Check point 2. Check indoor unit main PCB

• Check if main PCB is damaged.

• Change main PCB and check the error after setting remote controller address.



End

Check point 1. →ire installation

2-7. E: 29.↓. Connected unit number error (Indoor unit) - (03-21) - 2. Troubleshooting with error code

Page 64

2-8. E: 32.X. Indoor unit main PCB error (Indoor unit)

Operation indicator 3 time flash

Indicator

Detective actuator Indoor unit main PCB

Forecast of cause

Indoor unit

outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4

Timer indicator 2 time flash Economy indicator Continuous flash Error code E: 32

→hen power is on and there is some below case.

1. →hen model information of EEPROM is incorrect.

2. →hen the access to EEPROM failed. External cause

Defective connection of electric components

Main PCB failure

TROUBLESHOOTING

Does error indication show again?  If no, go to "Check point 1-2".



Check point 2. Check Indoor unit electric components

• Check all connectors. (loose connector or incorrect wiring)

• Check any shortage or corrosion on PCB.



Check point 3. Replace main PCB

Change main PCB.



End

Check point 1-2. Check external cause such as noise

Check point 1. Reset power supply and operate

• Check if the ground connection is proper.

• Check if there is any equipment that causes harmonic wave near the power cable (Neon light bulb or any electronic equipment which causes harmonic wave).



End

NOTE: EEPROM

EEPROM (Electronically Erasable and Programmable Read Only Memory) is a non-volatile memory which keeps memorized information even if the power is turned off. It can change the contents electronically. To change the contents, it uses higher voltage than normal, and it cannot change a partial contents. (Rewriting shall be done upon erasing the all contents.) There is a limit in a number of rewriting.

2-8. E: 32.↓. Indoor unit main PCB error (Indoor unit) - (03-22) - 2. Troubleshooting with error code

Page 65

2-9. E: 35.X. MANUAL AUTO button error (Indoor unit)

Operation indicator 3 time flash

Indicator

Detective actuator

Forecast of cause

Indoor unit

outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 Indoor unit controller PCB Indicator PCB Manual auto switch

Check point 1. Check the MANUAL AUTO but-

TROUBLESHOOTING

ton

• Check if MANUAL AUTO button is kept pressed.

• Check On/Off switching operation by using a meter.



Timer indicator 5 time flash Economy indicator Continuous flash Error code E: 35

→hen the MANUAL AUTO button becomes on for consecutive 30 (for 18 model) or 60 (for 24 model) or more seconds.

MANUAL AUTO button failure

Controller PCB and indicator PCB failure

TROUBLESHOOTING

If MANUAL AUTO button is disabled (on/off switching), replace it.

Check point 2. Replace main PCB and indicator PCB

If Check Point 1 does not improve the symptom, change main PCB and indicator PCB.



End

2-9. E: 35.↓. MANUAL AUTO button error (Indoor unit) - (03-23) - 2. Troubleshooting with error code

Page 66

2-10. E: 3A.X. Indoor unit communication circuit error (Indoor

unit)

Operation indicator 3 time flash Timer indicator 10 time flash Economy indicator Continuous flash Error code E: 3A

controller group abnormal or the indoor unit detects lack of the primary remote controller

Terminal connection abnormal

→ired remote controller failure

Indoor unit main PCB defective

Indicator

Detective actuator

Forecast of cause

Indoor unit

outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 →ired remote controller (2-wire) →hen the indoor unit detects the configuration of remote

Indoor unit controller PCB circuit

TROUBLESHOOTING

Check point 1. Check the connection of terminal

• After turning off the power supply, check and correct as follows: Indoor unit: Check the connection of the terminal between the remote controller and indoor unit, or between indoor units and check if there is a disconnection or short of the cable.



Check point 2. Check the indoor unit main PCB

• Check terminal voltage of CN2 (terminal 1—3) of UT↔-T→R↓Z2 (Communication kit) (for 18 model). Check voltage at CN12 of main PCB (terminal 1—2) (for 24 model) (Power supply for remote) If terminal voltage is DC 5 V (for 18 model) or DC 12 V (for 24 model), remote controller failure (Control PCB is OK).

If terminal voltage is DC 0 V, main PCB failure (Remote controller is OK).

NOTE: In case of re-installation is done due to removed connector or incorrect wiring, turn on the

power again.



End

2-10. E: 3A.↓. Indoor unit communication circuit error (Indoor unit) - (03-24) - 2. Troubleshooting with error code

Page 67

Tip

Factory setting: 2WIRE

2WIRE/3WIRE

JM9

Disconnected

2WIRE/

3WIRE

Factory setting: 3WIRE

Connected

(Factory setting)

JM9

Depending on the connected remote controller type, following setting is required:

Connected remote controller DIP switch Jumper (JM9)

2-wire type

3-wire type

• 2-wire type remote main PCB If the communication PCB is not connected and JM9 is disconnected, 3A error is displayed.

If the communication PCB is connected and JM9 is connected, the 2-wire remote controller does not work.

TROUBLESHOOTING

If the DIP switch is 3-wire side, the 2-wire type remote controller does not work.

TROUBLESHOOTING

• 3-wire type remote main PCB If the DIP switch is 2-wire side, the 3-wire type remote controller does not work.

2-10. E: 3A.↓. Indoor unit communication circuit error (Indoor unit) - (03-25) - 2. Troubleshooting with error code

Page 68

2-11. E: 41.X. Room temperature sensor error (Indoor unit)

Operation indicator 4 time flash

Indicator

Detective actuator

Forecast of cause

Indoor unit

outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 Indoor unit main PCB Room temperature thermistor

Check point 1. Check connection of connector

Timer indicator 1 time flash Economy indicator Continuous flash Error code E: 41

Room temperature thermistor is open or short is detected always.

Connector failure Thermistor failure

Main PCB failure

TROUBLESHOOTING

• Check if connector is loose or removed.

TROUBLESHOOTING

• Check erroneous connection.

• Check if thermistor cable is open

-> Reset power when reinstalling due to removed connector or incorrect wiring.



Check point 2. Remove connector and check thermistor resistance value

• For the room thermistor resistance value, refer to "Thermistor resistance values" on page 03-88.

• If thermistor is either open or shorted, replace it and reset the power.



Check point 3. Check voltage of main PCB

Make sure circuit diagram of each indoor unit and check terminal voltage at thermistor (DC 5.0 V).

NOTE: For details of thermistor connector, refer to "→iring diagrams" in Chapter 2.

TECHNICAL DATA AND PARTS LIST on page 02-18.

If the voltage does not appear, replace main PCB.



End

2-11. E: 41.↓. Room temperature sensor error (Indoor unit) - (03-26) - 2. Troubleshooting with error code

Page 69

2-12. E: 42.X. Indoor unit heat exchanger sensor error (Indoor

unit)

Operation indicator 4 time flash Timer indicator 2 time flash Economy indicator Continuous flash Error code E: 42

→hen heat exchanger temperature thermistor open or short circuit is detected.

Connector connection failure

Thermistor failure

Main PCB failure

Indicator

Detective actuator

Forecast of cause

Indoor unit

outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 Indoor unit main PCB Heat exchanger temperature

thermistor

TROUBLESHOOTING

Check point 1. Check connection of connector

• Check if connector is loose or removed.

• Check erroneous connection.

• Check if thermistor cable is open

-> Reset power when reinstalling due to removed connector or incorrect wiring.



Check point 2. Remove connector and check thermistor resistance value

• For the heat exchanger thermistor resistance value, refer to "Thermistor resis-

tance values" on page 03-88.

• If thermistor is either open or shorted, replace it and reset the power.



Check point 3. Check voltage of main PCB

Make sure circuit diagram of each indoor unit and check terminal voltage at thermistor (DC 5.0 V).

NOTE: For details of thermistor connector, refer to "→iring diagrams" in Chapter 2.

TECHNICAL DATA AND PARTS LIST on page 02-18.

If the voltage does not appear, replace main PCB.



End

2-12. E: 42.↓. Indoor unit heat exchanger sensor error (Indoor unit) - (03-27) - 2. Troubleshooting with error code

Page 70

2-13. E: 51.X. Indoor unit fan motor error (Indoor unit)

Operation indicator 5 time flash

Indicator

Detective actuator Indoor unit

Forecast of cause

Indoor unit

outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4

Timer indicator 1 time flash Economy indicator Continuous flash Error code E: 51

main PCB →hen the actual rotation number of the indoor unit fan

Fan motor

motor is below 1/3 of the target rotation number continuously for more than 56 seconds.

Fan rotation failure

Fan motor winding open

Motor protection by surrounding temperature rise

Control PCB failure

Indoor unit fan motor failure

TROUBLESHOOTING

Check point 1. Check rotation of fan

Rotate the fan by hand when operation is off. (Check if fan is caught, dropped off or locked motor)  If fan or bearing is abnormal, replace it.



Check point 2. Check ambient temperature around motor

Check excessively high temperature around the motor. (If there is any surrounding equipment that causes heat)  Upon the temperature coming down, restart operation.



Check point 3. Check indoor unit fan motor

Check Indoor unit fan motor. (Refer to indoor unit fan motor in "Service parts information" on page 03-80.)  If Indoor unit fan motor is abnormal, replace Indoor unit fan motor.



Check point 4. Replace main PCB

If Check Point 1 to 3 do not improve the symptom, replace main PCB.



End

2-13. E: 51.↓. Indoor unit fan motor error (Indoor unit) - (03-28) - 2. Troubleshooting with error code

Page 71

2-14. E: 58.X. Intake grille error (Indoor unit)

Operation indicator 5 time flash

Indicator

Detective actuator

Forecast of cause

Indoor unit

Outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 Indoor unit main PCB Micro switch

Check point 1. Check limit switch

Timer indicator 8 time flash Economy indicator Continuous flash Error code E: 58

→hen the Micro switch is detected open while running the compressor.

Micro switch failure

Shorted connector/wire

Main PCB failure

TROUBLESHOOTING

• Check operation of Micro switch. (any blocking by dust, etc.)

TROUBLESHOOTING

• Remove Micro switch and check ON/OFF switching operation by using a meter.

-> If micro switch is detective, replace it.



Check point 2. Check connector (CN11)/wire

Check loose contact of CN11/shorted wire (pinched wire).

-> Replace micro switch if the wire is abnormal



Check point 3. Replace main PCB

If Check Point 1 and 2 do not improve the symptom, change main PCB.



End

2-14. E: 58.↓. Intake grille error (Indoor unit) - (03-29) - 2. Troubleshooting with error code

Page 72

2-15. E: 62.X. Outdoor unit main PCB error (Outdoor unit)

Operation indicator 6 time flash

Indicator

Detective actuator Outdoor unit Main PCB

Forecast of cause

Indoor unit

outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4

Timer indicator 2 time flash Economy indicator Continuous flash Error code E: 62

Access to EEPROM failed due to some cause after outdoor unit started.

External cause (Noise, temporary open, voltage drop)

Main PCB failure

Check point 1. Reset power supply and operate

If no, go to "Check point 1-2".

Does error indication show again?

TROUBLESHOOTING



Check point 2. Replace main PCB

Change main PCB.



End

Check point 1-2. Check external cause

• Check if temporary voltage drop was not generated.

• Check if momentary open was not generated.

• Check if ground is connection correctly or there are no related cables near the power line.



End

2-15. E: 62.↓. Outdoor unit main PCB error (Outdoor unit) - (03-30) - 2. Troubleshooting with error code

Page 73

2-16. E: 63.X. Inverter error (Outdoor unit)

Operation indicator 6 time flash

Indicator

Detective actuator Outdoor unit Inverter PCB Error information received from inverter PCB Forecast of cause

Indoor unit

outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4

Timer indicator 3 time flash Economy indicator Continuous flash Error code E: 63

External cause

Power supply to inverter PCB wiring disconnection or

open

Inverter PCB failure

Check point 1. Turn the power on again?

If no, go to "Check point 1-2".

TROUBLESHOOTING

Error displayed again?

TROUBLESHOOTING



Check point 2. Check the wiring (power supply to inverter PCB)

• Connector and wiring connection state check

• Cable open check



Check point 3. Replace inverter PCB

Replace inverter PCB



End

Check point 1-2. Check external cause

• Check if temporary voltage drop was not generated.

• Check if momentary open was not generated.

• Check if ground is connection correctly or there are no related cables near the power line.



End

2-16. E: 63.↓. Inverter error (Outdoor unit) - (03-31) - 2. Troubleshooting with error code

Page 74

2-17. E: 64.X. PFC circuit error (Outdoor unit)

Operation indicator 6 time flash

Indicator

Detective actuator Outdoor unit Main PCB

Forecast of cause

Indoor unit

outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4

Timer indicator 4 time flash Economy indicator Continuous flash Error code E: 64

• →hen inverter input DC voltage is higher than 420 V for over 3 seconds, the compressor stops.

• If the same operation is repeated 5 times, the compressor stops permanently.

External cause

Connector connection failure

Main PCB failure

TROUBLESHOOTING

Check point 1. Check external cause at indoor and outdoor (Voltage drop or Noise)

TROUBLESHOOTING

• Instant drop: Check if there is a large load electric apparatus in the same circuit.

• Momentary power failure: Check if there is a defective contact or leak current in the power supply circuit.

• Noise: Check if there is any equipment causing harmonic wave near electric line. (Neon bulb or electric equipment that may cause harmonic wave) Check the complete insulation of grounding.



Check point 2. Check connection of Connector

• Check if connector is removed.

• Check erroneous connection.

• Check if cable is open.

 Upon correcting the removed connector or mis-wiring, reset the power.



Check point 3. Replace main PCB

If check point 1 to 2 do not improve the symptom, change main PCB.



End

2-17. E: 64.↓. PFC circuit error (Outdoor unit) - (03-32) - 2. Troubleshooting with error code

Page 75

2-18. E: 65.X. Trip terminal L error (Outdoor unit)

Operation indicator 6 time flash

Indicator

Detective actuator Outdoor unit Main PCB

Forecast of cause Main PCB failure

Indoor unit

outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4

Check point 1. Check main PCB

Replace the outdoor unit main PCB.

Timer indicator 5 time flash Economy indicator Continuous flash Error code E: 65

→hen the signal from FO terminal of IPM is “L” (0 V) during the compressor stopping.

TROUBLESHOOTING



TROUBLESHOOTING

End

2-18. E: 65.↓. Trip terminal L error (Outdoor unit) - (03-33) - 2. Troubleshooting with error code

Page 76

2-19. E: 71.X. Discharge thermistor error (Outdoor unit)

Operation indicator 7 time flash Timer indicator 1 time flash Economy indicator Continuous flash Error code E: 71

→hen discharge pipe temperature thermistor open or short circuit is detected at power on or while running the compressor

Connector failure Thermistor failure

Main PCB failure

Indicator

Detective actuator

Forecast of cause

Indoor unit

outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 Outdoor unit main PCB Discharge pipe temperature

thermistor

TROUBLESHOOTING

• Check if connector is loose or removed.

• Check erroneous connection.

• Check if thermistor cable is open

 Reset power when reinstalling due to removed connector or incorrect wiring.



Check point 2. Remove connector and check thermistor resistance value

• For the discharge temperature thermistor resistance value, refer to "Thermistor

resistance values" on page 03-88.

• If thermistor is either open or shorted, replace it and reset the power.



Check point 3. Check voltage of main PCB

Make sure circuit diagram of outdoor unit and check terminal voltage at thermistor (DC 5.0 V).

NOTE: For details of thermistor connector, refer to "→iring diagrams" in Chapter 2.

TECHNICAL DATA AND PARTS LIST on page 02-18.

Check point 1. Check connection of connector

If the voltage does not appear, replace main PCB.



End

2-19. E: 71.↓. Discharge thermistor error (Outdoor unit) - (03-34) - 2. Troubleshooting with error code

Page 77

2-20. E: 73.X. Heat exchanger (Middle/Outlet) temperature

thermistor error (Outdoor unit)

Operation indicator 7 time flash

Indicator

Detective actuator

Forecast of cause

TROUBLESHOOTING

Indoor unit

outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 Heat exchanger liquid temperature

thermistor Heat exchanger middle

temperature thermistor

Check Point 1 : Check the connector connection and cable open

• Connector connection state check

• Cable open check

Timer indicator 3 time flash Economy indicator Continuous flash Error code E: 73

• Heat exchanger liquid temperature thermistor short or open detected

• Heat exchanger middle temperature thermistor short or open detected

Connector failure Thermistor failure

Main PCB failure

TROUBLESHOOTING



Check Point 2 : Check the thermistor

• For the outdoor unit heat exchanger thermistor resistance value, refer to "Ther-

mistor resistance values" on page 03-88.

• If thermistor is either open or shorted, replace it and reset the power.



Check point 3. Check voltage of main PCB

Make sure circuit diagram of outdoor unit and check terminal voltage at thermistor (DC 5.0 V).

NOTE: For details of thermistor connector, refer to "→iring diagrams" in Chapter 2.

TECHNICAL DATA AND PARTS LIST on page 02-18.

If the voltage does not appear, replace main PCB.



End

2-20. E: 73.↓. Heat exchanger (Middle/Outlet) temperature thermistor error (Outdoor unit)

- (03-35) - 2. Troubleshooting with error code

Page 78

2-21. E: 74.X. Outdoor temperature thermistor error (Outdoor

unit)

Operation indicator 7 time flash Timer indicator 4 time flash Economy indicator Continuous flash Error code E: 74

circuit is detected at power on or while running the compressor

Connector failure Thermistor failure

Main PCB failure

Indicator

Detective actuator

Forecast of cause

Indoor unit

outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 Outdoor unit main PCB →hen outdoor temperature thermistor open or short

Outdoor temperature thermistor

TROUBLESHOOTING

Check point 1. Check connection of connector

• Check if connector is loose or removed.

• Check erroneous connection.

• Check if thermistor cable is open

-> Reset power when reinstalling due to removed connector or incorrect wiring.



Check point 2. Remove connector and check thermistor resistance value

• For the outdoor temperature thermistor resistance value, refer to "Thermistor re-

sistance values" on page 03-88.

• If thermistor is either open or shorted, replace it and reset the power.



Check point 3. Check voltage of main PCB

Make sure circuit diagram of outdoor unit and check terminal voltage at thermistor (DC 5.0 V).

NOTE: For details of thermistor connector, refer to "→iring diagrams" in Chapter 2.

TECHNICAL DATA AND PARTS LIST on page 02-18.

If the voltage does not appear, replace main PCB.



End

2-21. E: 74.↓. Outdoor temperature thermistor error (Outdoor unit) - (03-36) - 2. Troubleshooting with error code

Page 79

2-22. E: 77.X. Heat sink thermistor error (Outdoor unit)

Operation indicator 7 time flash

Indicator

Detective actuator Heat sink temperature thermistor Heat sink temperature thermistor short or open detected

Forecast of cause

Indoor unit

outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4

Check point 1. Check connection of connector

• Check if connector is loose or removed.

TROUBLESHOOTING

• Check erroneous connection.

• Check if thermistor cable is open

-> Reset power when reinstalling due to removed connector or incorrect wiring.

Timer indicator 7 time flash Economy indicator Continuous flash Error code E: 77

Connector failure Thermistor failure

Inverter PCB failure

TROUBLESHOOTING



Check point 2. Remove connector and check thermistor resistance value

• For the Heat sink thermistor resistance value, refer to "Thermistor resistance val-

ues" on page 03-88.

• If thermistor is either open or shorted, replace it and reset the power.



Check point 3. Check voltage of inverter PCB

Make sure circuit diagram of outdoor unit and check terminal voltage at thermistor (DC 5.0 V).

NOTE: For details of thermistor connector, refer to "→iring diagrams" in Chapter 2.

TECHNICAL DATA AND PARTS LIST on page 02-18.

If the voltage does not appear, replace inverter PCB.



End

2-22. E: 77.↓. Heat sink thermistor error (Outdoor unit) - (03-37) - 2. Troubleshooting with error code

Page 80

2-23. E: 84.X. Current sensor error (Outdoor unit)

Operation indicator 8 time flash

Indicator

Detective actuator Outdoor unit main PCB

Forecast of cause

Indoor unit

outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4

Timer indicator 4 time flash Economy indicator Continuous flash Error code E: 84

→hen input current sensor has detected 0 A, while inverter compressor is operating at higher than 56 rps, after 1 minute upon starting the compressor. (Except during the defrost operation)

Defective connection of electric components

External cause

Main PCB failure

TROUBLESHOOTING

Check point 1. Reset power supply and operate

TROUBLESHOOTING

If no, go to "Check point 1-2".

Does error indication show again?



Check point 2. Check connections of outdoor unit electrical components

• Check if the terminal connection is loose.

• Check if connector is removed.

Upon correcting the removed connector or miswiring, reset the power.

• Check erroneous connection.

• Check if cable is open.



Check point 3. Replace main PCB

If Check point 1, 2 do not improve the symptom, change main PCB.



End

Check point 1-2. Check external cause at Indoor and Outdoor (Voltage drop or Noise)

• Instant drop: Check if there is a large load electric apparatus in the same circuit.

• Momentary power failure: Check if there is a defective contact or leak current in the power supply circuit.

• Noise: Check if there is any equipment causing harmonic wave near electric line. (Neon bulb or electric equipment that may cause harmonic wave) Check the complete insulation of grounding.



End

2-23. E: 84.↓. Current sensor error (Outdoor unit) - (03-38) - 2. Troubleshooting with error code

Page 81

2-24. E: 86.X. High pressure switch error (Outdoor unit)

Pressure

Operation indicator 8 time flash

Indicator

Detective actuator

Forecast of cause

Indoor unit

outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 Outdoor unit main PCB High pressure switch

Check point 1. Check the high pressure switch connection state

Timer indicator 6 time flash Economy indicator Continuous flash Error code E: 86

→hen pressure switch open is detected in 10 seconds after the power is turned on.

High pressure switch connector disconnection or open

High pressure switch characteristics failure

Main PCB failure

TROUBLESHOOTING

• Check connector and wiring connection state.

TROUBLESHOOTING

• Check if cable is open

-> Reset power when reinstalling due to removed connector or incorrect wiring.



Check point 2. Check the high pressure switch characteristics

• Check switch characteristics. For the characteristics of the high pressure switch, refer to below.



Check point 3. Replace main PCB

Change main PCB and check operation again.



End

• Type of contact

• Characteristics of pressure switch

Pressure switch 1

Contact: Short  Open 4.2 ±0.1 MPa Contact: Open  Short 3.2 ±0.15 MPa

18/24 model: P770

2-24. E: 86.↓. High pressure switch error (Outdoor unit) - (03-39) - 2. Troubleshooting with error code

Page 82

2-25. E: 86.X. Pressure sensor error (Outdoor unit)

4.5

0.5

0 5

Pressure [MPa]

Voltage [V]

Operation indicator 8 time flash Timer indicator 6 time flash Economy indicator Continuous flash Error code E: 86

sensor detection value detects the condition below continuously for 30 seconds or more. Ps ≤ 0 or Ps ≥ 5 [MPa]

Connector connection failure

Pressure sensor failure

Main PCB failure

Indicator

Detective actuator

Forecast of cause

Indoor unit

Outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 Outdoor unit main PCB 30 seconds or more after power-on, when pressure

High pressure switch

TROUBLESHOOTING

Check point 1. Check connection of the pressure sensor

TROUBLESHOOTING

• Check if the terminal connection is loose.

• Check if connector is removed.

• Check erroneous connection.

• Check if cable is open.

-> Upon correcting the removed connector or mis-wiring, reset the power.



Check point 2. Check output voltage of main PCB

Make sure circuit diagram of outdoor unit and check terminal voltage at thermistor (DC 5.0 V ± 5%).

NOTE: For details of thermistor connector, refer to "→iring diagrams" in Chapter 2.

TECHNICAL DATA AND PARTS LIST on page 02-18.

If the voltage is not correct, replace main PCB.



Check point 3. Check output voltage of pressure sensor

Make sure circuit diagram of outdoor unit and check terminal voltage. Voltage is refer to the following graph.

If the voltage is not correct, replace pressure sensor.



End

2-25. E: 86.↓. Pressure sensor error (Outdoor unit) - (03-40) - 2. Troubleshooting with error code

Page 83

2-26. E: 94.X. Trip detection (Outdoor unit)

Operation indicator 9 time flash

Indicator

Detective actuator Outdoor unit

Forecast of cause

TROUBLESHOOTING

Indoor unit

outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4

Check point 1. Check the outdoor unit fan operation, heat-exchanger, ambient temperature

• No obstructions in air passages?

• Heat exchange fins clogged

• Outdoor unit fan motor check

• Ambient temperature not raised by the effect of other heat sources?

• Discharged air not sucked in?

Timer indicator 4 time flash Economy indicator Continuous flash Error code E: 94

Inverter PCB Protection stop by over-current generation after inverter Main PCB

Compressor

compressor start processing completed generated consecutively 10 times.

NOTE: The number of generations is reset when the

compressor starts up.

Outdoor unit fan operation defective, foreign matter on

heat-exchanger, excessive rise of ambient temperature

Main PCB failure

Inverter compressor failure (lock, winding short)

Inverter PCB

TROUBLESHOOTING



Check point 2. Replace inverter PCB

If Check point 1 do not improve the symptom, change inverter PCB.



Check point 3. Replace main PCB

If Check point 1, 2 do not improve the symptom, change main PCB.



Check point 4. Replace compressor

If Check point 3 do not improve the symptom, change compressor.



End

2-26. E: 94.↓. Trip detection (Outdoor unit) - (03-41) - 2. Troubleshooting with error code

Page 84

2-27. E: 95.X. Compressor motor control error (Outdoor unit)

Operation indicator 9 time flash

Indicator

Detective actuator Outdoor unit

TROUBLESHOOTING

Forecast of cause

Indoor unit

outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4

Check point 1. Check noise from compressor

Turn on power and check operation noise.  If an abnormal noise show, replace compressor.

Timer indicator 5 time flash Economy indicator Continuous flash Error code E: 95

Inverter PCB 1. →hen running the compressor, if the detected rotor Main PCB

Compressor

location is out of phase with actual rotor location more than 90°, the compressor stops.

2. After the compressor restarts, if the same operation is repeated within 40 seconds, the compressor stops again.

3. If 1. and 2. repeats 5 times, the compressor stops permanently.

Defective connection of electric components

Inverter PCB failure

Main PCB failure

Compressor failure

TROUBLESHOOTING



Check point 2. Check connection of around the compressor components

For compressor terminal, main PCB

• Check if connector is removed.

• Check erroneous connection.

• Check if cable is open. (Refer to inverter compressor in "Service parts information" on page 03-

80.)

 Upon correcting the removed connector or mis-wiring, reset the power.



Check point 3. Replace inverter PCB

If Check point 1, 2 do not improve the symptom, change inverter PCB.



Check point 4. Replace main PCB

If Check point 1 to 3 do not improve the symptom, change main PCB.



Check point 5. Replace compressor

If Check point 4 do not improve the symptom, change compressor.



End

2-27. E: 95.↓. Compressor motor control error (Outdoor unit) - (03-42) - 2. Troubleshooting with error code

Page 85

2-28. E: 97.X. Outdoor unit fan motor error (Outdoor unit)

Operation indicator 9 time flash

Indicator

Detective actuator Outdoor unit

TROUBLESHOOTING

Forecast of cause

Indoor unit

outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4

Check point 1. Check rotation of fan

Timer indicator 7 time flash Economy indicator Continuous flash Error code E: 97

Inverter PCB 1. →hen outdoor fan rotation speed is less than 100 Main PCB

Fan motor

rpm in 20 seconds after fan motor starts, fan motor stops.

2. After fan motor restarts, if the same operation within 60 seconds is repeated 3 times in a row, compressor and fan motor stops.

3. If 1. and 2. repeats 5 times in a row, compressor and fan motor stops permanently.

Fan rotation failure

Motor protection by surrounding temperature rise

Inverter PCB failure

Main PCB failure

Outdoor unit fan motor

TROUBLESHOOTING

Rotate the fan by hand when operation is off. (Check if fan is caught, dropped off or locked motor)  If fan or bearing is abnormal, replace it.



Check point 2. Check ambient temperature around motor

Check excessively high temperature around the motor. (If there is any surrounding equipment that causes heat)  Upon the temperature coming down, restart operation.



Check point 3. Check outdoor unit fan motor

Check outdoor unit fan motor. (Refer to outdoor unit fan motor in "Service parts information" on page 03-80.)  If outdoor unit fan motor is abnormal, replace outdoor unit fan motor and main PCB.



2-28. E: 97.↓. Outdoor unit fan motor error (Outdoor unit) - (03-43) - 2. Troubleshooting with error code

Page 86

Check point 4. Check output voltage of inverter PCB

1 2 3 4 5 6 7

BLACK WHITE YELLOW

RED

FAN MOTOR

BROWN

Check outdoor unit circuit diagram and the voltage. (Measure at inverter PCB side connector)

NOTE: For details of wiring diagram, refer to "→iring diagrams" in Chapter 2.

TECHNICAL DATA AND PARTS LIST on page 02-18.

Read wire DC voltage

Red—Black 280 V (AC 220 V -10 %) to 373 V (AC 240 V +10 %)

TROUBLESHOOTING

→hite—Black 15±1.5 V

TROUBLESHOOTING

-> If the voltage is not correct, replace inverter PCB.



Check point 5. Replace main PCB

If Check point 1 to 4 do not improve the symptom, change main PCB.



End

2-28. E: 97.↓. Outdoor unit fan motor error (Outdoor unit) - (03-44) - 2. Troubleshooting with error code

Page 87

2-29. E: 99.X. 4-way valve error (Outdoor unit)

Operation indicator 9 time flash

Indicator

Detective actuator

TROUBLESHOOTING

Forecast of cause

Indoor unit

outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 Indoor unit main PCB →hen the indoor heat exchanger temperature is Heat exchanger temperature

thermistor Room temperature thermistor

4-way valve

Timer indicator 9 time flash Economy indicator Continuous flash Error code E: 99

compared with the room temperature, and either following condition is detected continuously two times, the compressor stops. Indoor heat exchanger temp. - Room temp. > 20 °F (10 °C) (Cooling or Dry operation)

Indoor heat exchanger temp. - Room temp. < -20 °F (-10 °C) (Heating operation)

If the same operation is repeated 5 times, the compressor stops permanently.

Air filter clogged

Connector connection failure

Thermistor failure

Coil failure

4-way valve failure

Main PCB failure

TROUBLESHOOTING

Check point 1. Check air filter condition

Check air filter dirty.  If the air filter dirty, clean up the air filter.



Check point 2. Check connection of connector

• Check if connector is removed.

• Check erroneous connection.

• Check if thermistor cable is open.

 Upon correcting the removed connector or mis-wiring, reset the power.



Check point 3. Check each thermistor

• Isn’t it fallen off the holder?

• Is there a cable pinched?

Check characteristics of room thermistor and indoor unit heat exchanger thermistor. For the thermistor resistance value, refer to "Thermistor resistance values" on page 03-88.  If defective, replace the thermistor.



2-29. E: 99.↓. 4-way valve error (Outdoor unit) - (03-45) - 2. Troubleshooting with error code

Page 88

Check point 4. Check the solenoid coil and 4-way valve

NOTE: Refer solenoid coil and 4-way valve in "Service parts information" on page 03-80.

• Solenoid coil Remove P60 from PCB and check the resistance value of coil. Resistance value is 1.97 kΩ.

 If it is open or abnormal resistance value, replace solenoid coil.

• 4-way valve Check each piping temperature, and the location of the valve by the temperature difference.

If the value location is not proper, replace 4-way valve.



Check point 5. Replace main PCB

If Check Point 1 to 4 do not improve the symptom, replace main PCB.

TROUBLESHOOTING



TROUBLESHOOTING

End

2-29. E: 99.↓. 4-way valve error (Outdoor unit) - (03-46) - 2. Troubleshooting with error code

Page 89

2-30. E: A1.X. Discharge temperature error (Outdoor unit)

Operation indicator 10 time flash

Indicator

Detective actuator

Forecast of cause

TROUBLESHOOTING

Indoor unit

outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 Outdoor unit main PCB Protection stop by discharge temperature ≥ 230 °F

Discharge temperature thermistor

Check point 1. Check if 3-way valve is open

If the 3-way valve is closed, open the 3-way valve and check operation. NOTE: For cooling operation, check gas side of the 3-way valve.

For heating operation, check liquid side of the 3-way valve.

Timer indicator 1 time flash Economy indicator Continuous flash Error code E: A1

(110 °C) during compressor operation generated 2 times within 24 hours.

3-way valve not opened

EEV or capillary tube defective, strainer clogged

Outdoor unit operation failure, foreign matter on heat

exchanger

Discharge temperature thermistor failure

Insufficient refrigerant

Main PCB failure

TROUBLESHOOTING



Check point 2. Check any of the electronic expansion valve (EEV), capillary tube, or strainer, or all

• Check if EEV open or there is a capillary tube defect. Refer to outdoor unit Electrronic Expansion Valve (EEV) or Capillary tube in "Service parts in-

formation" on page 03-80.

• Check the strainer clogging.



Check point 3. Check the outdoor unit fan and heat exchanger

• Check for foreign object at heat exchanger

• Check if fan can be rotated by hand.

• Check the motor. (Refer to outdoor unit fan motor in "Service parts information" on page 03-

80.)



Check point 4. Check the discharge thermistor

The discharge temperature thermistor characteristics check. (Check by disconnecting thermistor from PCB.)

NOTE: For the characteristics of the thermistor, refer to "Thermistor resistance values" on page

03-88.



2-30. E: A1.↓. Discharge temperature error (Outdoor unit) - (03-47) - 2. Troubleshooting with error code

Page 90

Check point 5. Check the refrigerant amount

Check the refrigerant leakage.



Check point 6. Replace main PCB

If check point 1 to 5 do not improve the symptom, replace the main PCB.



End

TROUBLESHOOTING

2-30. E: A1.↓. Discharge temperature error (Outdoor unit) - (03-48) - 2. Troubleshooting with error code

Page 91

2-31. E: A5.X. Low pressure error (Outdoor unit)

Operation indicator 10 time flash

Indicator

Detective actuator

Forecast of cause

TROUBLESHOOTING

Indoor unit

outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 Outdoor unit main PCB Suction pressure sensor

Check point 1. Check if 3-way valve is open

If the 3-way valve is closed, open the 3-way valve and check operation. NOTE: For cooling operation, check gas side of the 3-way valve.

For heating operation, check liquid side of the 3-way valve.

Timer indicator 5 time flash Economy indicator Continuous flash Error code E: A5

Protection stop by suction pressure ≥ 0.02 MPaG continued 5 minutes repeats 5 times within 24 hours.

3-way valve not opened

Outdoor unit ambient temperature too low

Outdoor unit operation failure, foreign matter on heat

exchanger

EEV defective, strainer clogged

Solenoid valve defective

Low pressure sensor characteristics defective

Insufficient refrigerant

Main PCB failure

TROUBLESHOOTING



Check point 2. Check the outdoor unit ambient temperature (Only when heating operation)

Outdoor unit ambient temperature lower than operating range?



Check point 3. Check the outdoor unit fan and heat exchanger (Only when heating operation)

• No foreign object in air passage?

• Heat exchanger fins clogged?

• Fan rotes?

• Check the motor. (Refer to outdoor unit fan motor in "Service parts information" on page 03-

80.)



Check point 4. Check the electronic expansion valve (EEV) and strainer

• Check if EEV open. Refer to outdoor unit Electronic Expansion Valve (EEV) in "Service parts information" on page 03-80.

• Check the strainer clogging.



Check point 5. Check the suction pressure sensor

Check the suction pressure sensor characteristics. NOTE: For the characteristics of the thermistor, refer to suction pressure sensor in

"Service parts

information" on page 03-80.



2-31. E: A5.↓. Low pressure error (Outdoor unit) - (03-49) - 2. Troubleshooting with error code

Page 92

Check point 6. Check the refrigerant amount

Check the refrigerant leakage.



Check point 7. Replace main PCB

If check point 1 to 6 do not improve the symptom, replace the main PCB.



End

TROUBLESHOOTING

2-31. E: A5.↓. Low pressure error (Outdoor unit) - (03-50) - 2. Troubleshooting with error code

Page 93

2-32. E: AC.X. Heat sink temperature error (Outdoor unit)

Operation indicator 10 time flash Timer indicator 12 time flash Economy indicator Continuous flash Error code E: AC

(80 °C) during heat sink operation generated 2 times within 24 hours.

Foreign matter on heat sink, heat sink dirty

Foreign matter on heat exchanger, excessive ambient

temperature rise

Heat sink temp. thermistor defective

Indicator

Detective actuator

Forecast of cause

Indoor unit

outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4 Outdoor unit inverter PCB Protection stop by heat sink temperature ≥ 176 °F

Heat sink temperature thermistor

TROUBLESHOOTING

Check point 1. Check the heat sink state

TROUBLESHOOTING

Heat sink foreign matter, soiling check



Check point 2. Check the foreign matter and ambient temperature of heat exchanger

• Heat exchange foreign matter check

• Ambient temperature not raised by effect of other heat sources?

• Discharged air not sucked in?



Check point 3. Check the heat sink temperature thermistor

The heat sink temperature thermistor characteristics check. (Check by disconnecting thermistor from PCB.)

NOTE: For the characteristics of the thermistor, refer to "Thermistor resistance values" on page

03-88.



Check point 4. Replace inverter PCB

Replace inverter PCB



End

2-32. E: AC.↓. Heat sink temperature error (Outdoor unit) - (03-51) - 2. Troubleshooting with error code

Page 94

3. Troubleshooting without error code

3-1. Indoor unit—No power

Power supply failure

Forecast of cause

Electrical components defective

Check point 1. Check installation condition

• Isn’t the breaker down?

• Check loose or removed connection cable.

-> If abnormal condition is found, correct it by referring to the installation manual or the “DESIGN &

TROUBLESHOOTING

TECHNICAL MANUAL”.



Check point 2. Check external cause at indoor and outdoor (voltage drop or noise)

• Instant drop: Check if there is a large load electric apparatus in the same circuit.

• Momentary power failure: Check if there is a defective contact or leak current in the power supply circuit.

• Noise: Check if there is any equipment causing harmonic wave near electric line. (Neon bulb or electric equipment that may cause harmonic wave) Check the complete insulation of grounding.

External cause

TROUBLESHOOTING



Check point 3. Check electrical components

Check the voltage of power supply. Check if AC 187 to 253 V appears at outdoor unit terminal L—N.

-> If no, go to "Check point 1" and "Check point 2".



• Check fuse in filter PCB. If fuse is open, check if the wiring between terminal and filter PCB is loose, and replace fuse.

• Check varistor in filter PCB. If varistor is defective, there is a possibility of an abnormal power supply.

Check the correct power supply and replace varistor. Upon checking the normal power supply, replace varistor.



End

3-1. Indoor unit—No power - (03-52) - 3. Troubleshooting without error code

Page 95

3-2. Outdoor unit—No power

Power supply failure

Forecast of cause

Electrical components defective

Check point 1. Check installation condition

• Is the circuit breaker on or off?

• Check loose or removed connection cable.

 If abnormal condition is found, correct it by referring to the installation manual or the “DESIGN & TECHNICAL MANUAL”.



External cause

TROUBLESHOOTING

Check point 2. Check external cause at indoor and outdoor (voltage drop or noise)

TROUBLESHOOTING

• Instant drop: Check if there is a large load electric apparatus in the same circuit.

• Momentary power failure: Check if there is a defective contact or leak current in the power supply circuit.

• Noise: Check if there is any equipment causing harmonic wave near electric line. (Neon bulb or electric equipment that may cause harmonic wave) Check the complete insulation of grounding.



Check point 3. Check electrical components

Check the voltage of power supply. Check if AC 198 to 264 V appears at outdoor unit terminal L—N  If no, go to "Check point 1" and "Check point 2".



• Check fuse in main PCB. If fuse is open, check if the wiring between terminal and main PCB is loose, and replace fuse.

• Check varistor in main PCB. If varistor is defective, there is a possibility of an abnormal power supply. Check the correct power supply and replace varistor.

 Upon checking the normal power supply, replace varistor.



Check point 4. Replace main PCB

If check point 1 to 3 do not improve the symptom, change main PCB.



End

3-2. Outdoor unit—No power - (03-53) - 3. Troubleshooting without error code

Page 96

3-3. No operation (Power is on)

Setting/ Connection failure

Forecast of cause

Electrical components defective

Check point 1. Check indoor and outdoor installation condition

• Indoor unit: – Check incorrect wiring between indoor unit and remote controller. – Check if there is an open cable connection.

• Are these indoor unit, outdoor unit, and remote controller suitable model numbers to connect?

-> If there is some abnormal condition, correct it by referring to the installation manual and “DESIGN & TECHNICAL MANUAL”.

TROUBLESHOOTING



Turn off the power and check correct followings.

• Is there loose or removed communication line of indoor unit and outdoor unit?



External cause

TROUBLESHOOTING

Check point 2. Check external cause at indoor and outdoor (Voltage drop or Noise)

• Instant drop: Check if there is a large load electric apparatus in the same circuit.

• Momentary power failure: Check if there is a defective contact or leak current in the power supply circuit.

• Noise: Check if there is any equipment causing harmonic wave near electric line. (Neon bulb or electric equipment that may cause harmonic wave) Check the complete insulation of grounding.



Check point 3. Check wired remote controller and controller PCB

Check voltage at CN2 (terminal 1—3) of UT↔-T→R↓Z2 (Communication kit) (for 18 model). Check voltage at CN12 of main PCB (terminal 1—2) (for 24 model).

(Power supply to remote controller)

• If it is DC 5 V (for 18 model) and DC 12 V (for 24 model), remote controller is failure. (The controller PCB is normal)

-> Replace remote controller.

• If it is DC 0 V, controller PCB is failure. (Check the remote controller once again)

-> Replace controller PCB.



Check point 4. Replace main PCB

If check point 1 to 3 do not improve the symptom, change main PCB.



End

3-3. No operation (Power is on) - (03-54) - 3. Troubleshooting without error code

Page 97

3-4. No cooling/No heating

MPa MPa

Forecast of cause

Check point 1. Check Indoor unit

• Does Indoor unit fan run in the HIGH mode?

• Is air filter dirty?

• Is heat exchanger clogged?

• Check if energy save function is operated.

Indoor unit error

Outdoor unit error

Effect by surrounding environment

Connection pipe/Connection wire failure

Refrigeration cycle failure

TROUBLESHOOTING



TROUBLESHOOTING

Check point 2. Check outdoor unit operation

• Check if outdoor unit is operating.

• Check any objects that obstruct the air flow route.

• Check if heat exchanger is clogged.

• Is the valve open?



Check point 3. Check site condition

• Is capacity of Indoor unit fitted to the room size?

• Any windows open or direct sunlight?



Check point 4. Check Indoor/ Outdoor installation condition

• Check connection pipe (specified pipe length and pipe diameter?)

• Check any loose or removed communication line.

 If there is an abnormal condition, correct it by referring to the installation manual or the “DESIGN & TECHNICAL MANUAL”.



Check point 5. Check Refrigeration cycle

• Check if strainer is clogged (Refer to the figure below).

• Measure gas pressure, and if there is a leakage, correct it.

• Check if EEV open or there is a capillary tube defect. Refer to outdoor unit Electrronic Expansion Valve (EEV) or Capillary tube in

"Service parts information" on page 03-80.

• Check compressor. Refer to compressor in "Service parts information" on page 03-80.

Refer to inverter compressor in "Service parts information" on page 03-80.

NOTE: →hen recharging the refrigerant, make sure to perform vacuuming,

and recharge the specified amount.



End

3-4. No cooling/No heating - (03-55) - 3. Troubleshooting without error code

Page 98

NOTES:

Pipe (In) Pipe (Out)

• Strainer normally does not have temperature difference between inlet and outlet as shown below.

• If there is a difference like shown below, there is a possibility of inside clogged. In this case, replace the strainer.

TROUBLESHOOTING

3-4. No cooling/No heating - (03-56) - 3. Troubleshooting without error code

Page 99

3-5. Abnormal noise

Forecast of cause

Diagnosis method when abnormal noise is occurred

Abnormal installation (indoor unit/outdoor unit)

Fan failure (indoor unit/outdoor unit)

Compressor failure (outdoor)

Abnormal noise is coming from Indoor unit. (Check and correct followings)

Abnormal noise is coming from Outdoor unit.

(Check and correct followings)

 

TROUBLESHOOTING

tion?

• Is the installation of air suction grille and front panel normal?

• Is main unit installed in stable condi-

• Is main unit installed in stable condition?

• Is fan guard installed normally?

TROUBLESHOOTING

 

• Is fan broken or deformed?

• Is the screw of fan loose?

• Is there any object which obstruct the fan rotation?

• Is fan broken or deformed?

• Is the screw of fan loose?

• Is there any object which obstruct the fan rotation?

 

End

Check if vibration noise by loose bolt or contact noise of piping is happening.



Is compressor locked?

• Check Compressor Refer to compressor and inverter compressor in "Service parts information" on page 03-80.



End

3-5. Abnormal noise - (03-57) - 3. Troubleshooting without error code

Page 100

3-6. Water leaking

MPa MPa

Forecast of cause

Diagnosis method when water leak occurs

Diagnosis method when water is spitting

Erroneous installation

Drain hose failure

out

• Is main unit installed in stable condition?

• Is main unit broken or deformed at the

Is the filter clogged?

time of transportation or maintenance?

 

TROUBLESHOOTING

• Is drain hose connection loose?

• Is there a trap in drain hose?

Check gas pressure and correct it if there was a gas leak.

• Is drain hose clogged?

 

Is fan rotating? End



End

3-6. →ater leaking - (03-58) - 3. Troubleshooting without error code

Fujitsu 24LMAS1, 18LMAS1 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

SERVICE MANUAL

1. GENERAL INFORMATION

1. Specifications

1-1. Indoor unit

1-2. Outdoor unit

2. Dimensions

2-1. Indoor unit

Model: ASUH18LMAS

¢ Model: ASUH24LMAS

2-2. Outdoor unit

Models: AOUH18LMAS1 and AOUH24LMAS1

2. TECHNICAL DATA AND PARTS LIST

1. Precautions

2. Indoor unit parts list

2-1. Model: ASUH18LMAS

Exterior parts

Chassis

2-2. Model: ASUH24LMAS

Exterior parts

Chassis

3. Outdoor unit parts list

3-1. Models: AOUH18LMAS1 and AOUH24LMAS1

Exterior parts and chassis

Compressor

4. Accessories

4-1. Indoor unit

Model: ASUH18LMAS

Model: ASUH24LMAS

4-2. Outdoor unit

Models: AOUH18LMAS1 and AOUH24LMAS1

5. Refrigerant system diagrams

5-1. Models: AOUH18LMAS1 and AOUH24LMAS1

6. Wiring diagrams

6-1. Indoor unit

Models: ASUH18LMAS and ASUH24LMAS

6-2. Outdoor unit

Models: AOUH18LMAS1 and AOUH24LMAS1

7. PC board diagrams

7-1. Models: ASUH18LMAS and ASUH24LMAS

7-2. Models: AOUH18LMAS1 and AOUH24LMAS1

3. TROUBLESHOOTING

1. Error code

1-1. How to check the error memory

1-2. How to erase the error memory

1-3. Error code table (Indoor unit and wired remote controller)

1-4. Error code table (Outdoor unit)

1-5. Error code table (Wireless LAN indicator)

1-6. Error code table (Mobile app)

1-7. Error message for wireless LAN control (Mobile app)

2. Troubleshooting with error code

2-4. E: 18.X. External communication error (Indoor unit)

2-5. E: 23.X. Combination error (Outdoor unit)

2-7. E: 29.X. Connected unit number error (Indoor unit)

2-8. E: 32.X. Indoor unit main PCB error (Indoor unit)

2-9. E: 35.X. MANUAL AUTO button error (Indoor unit)

2-11. E: 41.X. Room temperature sensor error (Indoor unit)

2-13. E: 51.X. Indoor unit fan motor error (Indoor unit)

2-14. E: 58.X. Intake grille error (Indoor unit)

2-15. E: 62.X. Outdoor unit main PCB error (Outdoor unit)

2-16. E: 63.X. Inverter error (Outdoor unit)

2-17. E: 64.X. PFC circuit error (Outdoor unit)

2-18. E: 65.X. Trip terminal L error (Outdoor unit)

2-19. E: 71.X. Discharge thermistor error (Outdoor unit)

2-22. E: 77.X. Heat sink thermistor error (Outdoor unit)

2-23. E: 84.X. Current sensor error (Outdoor unit)

2-24. E: 86.X. High pressure switch error (Outdoor unit)

2-25. E: 86.X. Pressure sensor error (Outdoor unit)

2-26. E: 94.X. Trip detection (Outdoor unit)

2-27. E: 95.X. Compressor motor control error (Outdoor unit)

2-28. E: 97.X. Outdoor unit fan motor error (Outdoor unit)

2-29. E: 99.X. 4-way valve error (Outdoor unit)

2-30. E: A1.X. Discharge temperature error (Outdoor unit)

2-31. E: A5.X. Low pressure error (Outdoor unit)

2-32. E: AC.X. Heat sink temperature error (Outdoor unit)

3. Troubleshooting without error code

3-1. Indoor unit—No power