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   A full list of LG air conditioning fault codes by keyword

 
 

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Fault Codes:

Keyword

Response

00

Text the 1, 2 or 3 digit fault code number only. I.e. If you see fault code CH07 on your indoor unit or R/Controller, only type 7 or 07 in your text message.

01

Indoor unit return air sensor fault. Disconnect sensor from PCB and measure resistance. 8 kOhm at 30C and 13 kOhm at 20C if not replace sensor

1

Indoor unit return air sensor fault. Disconnect sensor from PCB and measure resistance. 8 kOhm at 30C and 13 kOhm at 20C if not replace sensor

02

Indoor Pipe Sensor or Outdoor Sensor Assy fault, Open or Short. Disconnect from PCB and measure resistance. Air sensor = 10 kOhm at 25C, Pipe sensor = 5 kOhm at 25C. If not replace sensor.

2

Indoor Pipe Sensor or Outdoor Sensor Assy fault, Open or Short. Disconnect from PCB and measure resistance. Air sensor = 10 kOhm at 25C, Pipe sensor = 5 kOhm at 25C. If not replace sensor.

03

Remote controller comms error. Check wired correctly, if so check dipswitch in RC. Set to Sg for 1 unit, or Gr for group then reset power

3

Remote controller comms error. Check wired correctly, if so check dipswitch in RC. Set to Sg for 1 unit, or Gr for group then reset power

04

RAC Product = Heat Sink Sensor Error, Open/Short Cct or over 95C. Commercial Product = Condensate pump float switch risen. Check drain pan is empty, check pump is working OK. If no pump check blue jumper plug is inserted in socket CN Float.

4

RAC Product = Heat Sink Sensor Error, Open/Short Cct or over 95C. Commercial Product = Condensate pump float switch risen. Check drain pan is empty, check pump is working OK. If no pump check blue jumper plug is inserted in socket CN Float.

05

Comms Error, check your wiring, remove external pumps. Split/Multi - check volts from terminal N to 3 = 0 - 65 Vdc, Multi V - 4 Vdc terminals 3 and 4

5

Comms Error, check your wiring, remove external pumps. Split/Multi - check volts from terminal N to 3 = 0 - 65 Vdc, Multi V - 4 Vdc terminals 3 and 4

06

Indoor unit coil sensor fault. Disconnect from PCB measure resistance. 10 kOhm at 10C and 4 kOhm at 30C. if not replace sensor. Split = text 21

6

Indoor unit coil sensor fault. Disconnect from PCB measure resistance. 10 kOhm at 10C and 4 kOhm at 30C. if not replace sensor. Split = text 21

07

Multi Splits and Multi V = indoor unit is set to run in a different mode from the master indoor unit. Set ALL indoor units to cooling or ALL to heating to clear. Splits = Compressor Over Current (CT2), also see Code 06.

7

Multi Splits and Multi V = indoor unit is set to run in a different mode from the master indoor unit. Set ALL indoor units to cooling or ALL to heating to clear. Splits = Compressor Over Current (CT2), also see Code 06.

RAC Indoor unit BLDC Fan problem. This is caused by the Indoor fan being locked. Check fan motor is plugged in correctly, Electrically & Mechanically sound.

08

Check the fan motor turns freely, check the AC Voltage supplied to the fan motor, this will vary from 120 V ac at low speed to 170V AC at high speed. If no

Voltage is present the the PCB is faulty, if Voltage is present the fan motor will be Faulty.

RAC Indoor unit BLDC Fan problem. This is caused by the Indoor fan being locked. Check fan motor is plugged in correctly, Electrically & Mechanically sound.

8

Check the fan motor turns freely, check the AC Voltage supplied to the fan motor, this will vary from 120 V ac at low speed to 170V AC at high speed. If no

Voltage is present the the PCB is faulty, if Voltage is present the fan motor will be Faulty.

09

Split = Outdoor unit fan problem. Check Outdoor fan motor is plugged in, Electrically & Mechanically sound, if not replace motor, otherwise replace PCB. Multi V = Indoor unit EEPROM error - Replace the indoor unit PCB, and then make sure to do Auto addressing and input the address of central control.

9

Split = Outdoor unit fan problem. Check Outdoor fan motor is plugged in, Electrically & Mechanically sound, if not replace motor, otherwise replace PCB. Multi V = Indoor unit EEPROM error - Replace the indoor unit PCB, and then make sure to do Auto addressing and input the address of central control.

10

RAC Product: Compressor discharge sensor fault. Disconnect from PCB measure resistance 237 kOhm at 20C, 168 kOhm at 30C. Multi Fdx & Multi V text 8

11

Multi V indoor unit not connected to an outdoor unit. Check comms wiring is correct, and check initialisation has been carried out correctly

12

RAC Product = EEPROM Sum Check Error, text 60 for help.

13

RAC Product = PSC (Reactor) Error, text 27 for help.

14

RAC Product = Compressor Phase Current Error

15

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

16

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

17

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

18

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

19

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

20

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

21

Inverter compressor run current high. Check compressor windings all equal 1 to 4 Ohms, Check to earth 50 MOhm minimum, check run current

22

Inverter compressor run current high. Check compressor windings all equal 1 to 4 Ohms . Check to earth 50 MOhm minimum, check run current

23

Inverter dc voltage low. Check dc voltage of capacitors 300 Vdc for 1Ph and 600 Vdc for 3Ph. If OK change outdoor inverter PCB

24

Splits and Multi Splits = High or low pressure trip. Low at 1 bar High at 35 bar check pressures. Multi V = High pressure trip.

25

Check power supply voltage to the outdoor unit is correct (1ph ?220 Vac 10% or 3ph ?380 Vac 10%). If OK, check fuses, if fuses are OK replace outdoor main PCB

26

Inverter compressor seized. Check compressor windings all equal resistance 1 to 4 Ohms, check to earth 50 MOhm minimum, check run current and Inverter outputs

27

Inverter current irregularity. Check inverter PCB, check reactor connections and its resistance is less than 1 ohm.

28

Inverter dc voltage too high. Check dc voltage of capacitors 300 Vdc for 1Ph and 600 Vdc for 3Ph. If OK change outdoor inverter PCB

29

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

30

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

31

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

32

Inverter compressor discharge temperature too high. If over 105C, check refrigerant charge

33

Excessive rise of standard compressor discharge temperature. If over 105C check refrigerant charge

34

Excessive high pressure rise, over 35 bar at HP sensor. Check pressures, check coils, and filters are clean check for OFN in system pipework

35

Excessive low pressure drop under 1 Bar at LP sensor. Check pressures, and check service valves open

36

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

37

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

38

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

39

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

40

Inverter ac current abnormal. Check compressor windings all equal resistance 1 to 4 Ohms, check to earth 50 MOhm minimum, check run current and inverter outputs

41

Inverter compressor discharge sensor fault. Disconnect from PCB measure resistance 237 kOhm at 20C and 168 kOhm at 30C.

42

Low pressure sensor fault. Check dc voltage between white and black cable on plug. Multi V: 1 Vdc = 4 bar up to 5 Vdc = 32 bar

43

High pressure sensor fault. Check dc voltage between white and black cable on plug. Multi V: 1 Vdc = 8 bar up to 2.5 Vdc = 37 bar

44

Outdoor unit air sensor fault. Disconnect from PCB and measure resistance. 8 kOhm at 30C and 13 kOhm at 20C. If OK replace PCB, if not replace sensor

45

Outdoor unit coil sensor fault. Disconnect from PCB measure resistance. 10 kOhm at 10C and 4 kOhm at 30C. If OK replace PCB, if not replace sensor

46

Outdoor unit suction sensor fault. Disconnect from PCB and measure resistance. 10 kOhm at 10C and 4 kOhm at 30C. If OK replace PCB, if not replace sensor

47

Compressor discharge sensor fault. Disconnect from PCB measure resistance. 237 kOhm at 20C and 168 kOhm at 30C. If OK replace PCB, if not replace sensor

48

Split/Multi Split = Outdoor unit discharge and air sensor both unplugged. Multi V = Outdoor unit coil sensor. Text 45 for diagnostics

49

Check power supply voltage to the outdoor unit is correct (1ph ?220 Vac 10% or 3ph ?380 Vac 10%). If OK check fuses, if fuses OK, replace outdoor main PCB

50

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

51

Unit mismatch. Check model number of units do not exceed maximum. Multi V - also check Sub outdoor unit dipswitch settings

52

Communication error between inverter PCB and main outdoor unit PCB. Check wiring fuses and LEDs . If OK either inverter or main PCB defective

 

53

Comms error indoor to outdoor unit. Check your wiring . Split and Multi - check voltage from terminal N to 3 = 0 - 65 Vdc, Multi V - 4 Vdc terminals 3 and 4

54

Reverse or open phase. Check all 3 phases are present and correct. If correct voltage appears at all three phases, swap any two to cure the fault

55

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

56

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

57

Comms error between outdoor main PCB and inverter PCB. Check wiring fuses and LEDs are lit. If OK either inverter or main PCB defective

58

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

59

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

60

Outdoor unit PCB EEPROM failure, try removing EEPROM and refitting if removable (possible contact fault), otherwise replace PCB if the EEPROM is non-removable.

61

Condenser coil over 65C. Check coil and filters are clean and free from debris, and airflow is OK. Check system pressures for non-condesables

62

Inverter over 85C. Check air flow across heat sink, check inverter tight to heatsink use thermal paste. Multi V - check inverter cooling fan

63

Multi F(DX) - "Cond. Pipe Sensor Temp. Low" (opposite to Error Code 61). Check Temperature/Resistance reading and replace sensor if found to be faulty. If sensor okay, check for cause of low temperature and rectify.

64

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

65

Outdoor unit inverter fin temperature sensor fault. Disconnect from PCB measure resistance. 8 kOhm at 30C and 13 kOhm at 20C

67

Outdoor Fan Motor siezed, or rotation sensing circuit failure. Check motor for mechanical and/or electrical failure, if okay replace pcb.

100

Excessive discharge temperature rise 105C Sub condenser 1 standard compressor. Check refrigerant

101

Excessive discharge temperature rise 105C Sub condenser 1 standard compressor. Check refrigerant

102

Excessive discharge temperature rise 105C Sub condenser 2 standard compressor. Check refrigerant

103

Excessive discharge temperature rise 105C Sub condenser 2 standard compressor. Check refrigerant

104

Communication error between Main and Sub outdoor units. Check comms wiring and power to all outdoor units

105

Communication error between outdoor main PCB and fan PCB. Check plug connections and LEDs. If OK, replace either main or fan PCB

106

Outdoor unit fan motor high current. Check fans rotate freely, and are connected correctly

107

Outdoor unit low voltage to fan PCB. Check 300 Vdc supply, check fuses and plug connections. If OK, replace fan PCB

108

Communication error between outdoor main PCB, and fan PCB. Check plug connections and LEDs. If OK replace either main or fan PCB

109

Sub 1 excessive rise of high pressure. Check pressures, check for non condensables, check heat exchanger coil is free from debris

110

Sub 1 reverse or open phase. Check all 3 phases are present and correct. If correct voltage appears at all three phases, swap any two to cure the fault

111

Communication error between Main and Sub outdoor units. Check comms wiring and power to all outdoor units

113

Main outdoor unit liquid pipe sensor fault. Disconnect from PCB and measure resistance. 10 kOhm at 10C and 4 kOhm at 30C

114

Main outdoor unit Subcool inlet sensor fault. Disconnect from PCB and measure resistance. 10 kOhm at 10C and 4 kOhm at 30C

115

Main outdoor unit Subcool outlet sensor fault. Disconnect from PCB and measure resistance. 10 kOhm at 10C and 4 kOhm at 30C

116

Sub 1 high pressure sensor fault. Check dc voltage between white and black cable on plug. Multi V: 1 Vdc = 8 bar up to 2.5 Vdc = 37 bar

117

Sub 1 low pressure sensor fault. Check dc voltage between white and black cable on plug. Multi V: 1 Vdc = 4 bar up to 5 Vdc = 32 bar

118

Sub 1 outdoor unit air sensor fault. Disconnect from PCB and measure resistance. 8 kOhm at 30C and 13 kOhm at 20C. If OK replace PCB, if not replace sensor

120

Sub 1 outdoor unit suction sensor fault. Disconnect from PCB and measure resistance. 10 kOhm at 10C and 4 kOhm at 30C. if not replace sensor

121

Sub 1 compressor 1 discharge sensor fault. Disconnect from PCB measure resistance 237 kOhm at 20C and 168 kOhm at 30C. if not replace sensor

122

Sub 1 compressor 2 discharge sensor fault. Disconnect from PCB measure resistance 237 kOhm at 20C and 168 kOhm at 30C. if not replace sensor

123

Sub 1 outdoor unit coil sensor A fault. Disconnect from PCB measure resistance. 10 kOhm at 10C and 4 kOhm at 30C. If OK replace PCB, if not replace sensor

124

Sub 1 outdoor unit coil sensor B fault. Disconnect from PCB measure resistance. 10 kOhm at 10C and 4 kOhm at 30C. If OK replace PCB, if not replace sensor

125

Sub 1 outdoor unit liquid pipe sensor fault. Disconnect from PCB and measure resistance. 10 kOhm at 10C and 4 kOhm at 30C

126

Sub 1 outdoor unit Subcool inlet sensor fault. Disconnect from PCB and measure resistance. 10 kOhm at 10C and 4 kOhm at 30C

127

Sub 1 outdoor unit Subcool outlet sensor fault. Disconnect from PCB and measure resistance. 10 kOhm at 10C and 4 kOhm at 30C

128

Sub 2 high pressure sensor fault. Check dc voltage between white and black cable on plug. Multi V: 1 Vdc = 8 bar up to 2.5 Vdc = 37 bar

129

Sub 2 low pressure sensor fault. Check dc voltage between white and black cable on plug. Multi V: 1 Vdc = 4 bar up to 5 Vdc = 32 bar

130

Sub 2 outdoor unit air sensor fault. Disconnect from PCB and measure resistance. 8 kOhm at 30C and 13 kOhm at 20C. If OK replace PCB, if not replace sensor

132

Sub 2 outdoor unit suction sensor fault. Disconnect from PCB and measure resistance. 10 kOhm at 10C and 4 kOhm at 30C.if not replace sensor

133

Sub 2 compressor 1 discharge sensor fault. Disconnect from PCB measure resistance 237 kOhm at 20C and 168kOhm at 30C. if not replace sensor

134

Sub 2 compressor 2 discharge sensor fault. Disconnect from PCB measure resistance 237 kOhm at 20C and 168kOhm at 30C.if not replace sensor

135

Sub 2 outdoor unit coil sensor A fault. Disconnect from PCB measure resistance. 10 kOhm at 10C and 4 kOhm at 30C. If OK replace PCB, if not replace sensor

136

Sub 2 outdoor unit coil sensor B fault. Disconnect from PCB measure resistance. 10 kOhm at 10C and 4 kOhm at 30C. If OK replace PCB, if not replace sensor

137

Sub 2 outdoor unit liquid pipe sensor fault. Disconnect from PCB and measure resistance. 10 kOhm at 10C and 4 kOhm at 30C

138

Sub 2 outdoor unit Subcool inlet sensor fault. Disconnect from PCB and measure resistance. 10 kOhm at 10C and 4 kOhm at 30C

139

Sub 2 outdoor unit Subcool outlet sensor fault. Disconnect from PCB and measure resistance. 10 kOhm at 10C and 4 kOhm at 30C

140

Sub 2 excessive rise of high pressure. Check pressures, check for non condensables, check heat exchanger coil is free from debris

141

Sub 2 reverse or open phase. Check all 3 phases are present and correct. If correct voltage appears at all three phases, swap any two to cure the fault

142

Communication error between Main and Sub outdoor units. Check comms wiring and power to all outdoor units

143

Sub 1 excessive rise of high pressure. Check pressures, check for non condensables, check heat exchanger coil is free from debris

144

Sub 1 excessive drop of low pressure. Check pressures, check for non condensables, check heat exchanger coil is free from debris

145

Sub 2 excessive rise of high pressure. Check pressures, check for non condensables, check heat exchanger coil is free from debris

146

Sub 2 excessive drop of low pressure. Check pressures, check for non condensables, check heat exchanger coil is free from debris

147

Sub 1 check power supply voltage to the outdoor unit is correct (1ph 220 Vac 10% or 3ph 380 Vac 10%).check fuses, if fuses OK replace outdoor main PCB

148

Sub 1 check power supply voltage to the outdoor unit is correct (1ph 220 Vac 10% or 3ph 380 Vac 10%). check fuses, if fuses OK replace outdoor main PCB

149

Sub 2 check power supply voltage to the outdoor unit is correct (1ph 220 Vac 10% or 3ph 380 Vac 10%). check fuses, if fuses OK replace outdoor main PCB

150

Sub 2 check power supply voltage to the outdoor unit is correct (1ph 220 Vac 10% or 3ph 380 Vac 10%). check fuses, if fuses OK replace outdoor main PCB

151

Faulty 4 way valve. Check solenoid coil and output from PCB. If OK, mechanical failure.

152

Excessive discharge temperature rise 105C Sub condenser 2 standard compressor. Check refrigerant

153

Excessive discharge temperature rise 105C Sub condenser 2 standard compressor. Check refrigerant

154

Sub 3 excessive rise of high pressure. Check pressures, check for non condensables, check heat exchanger coil is free from debris

155

Sub 3 reverse or open phase. Check all 3 phases are present and correct. If correct voltage appears at all three phases, swap any two to cure the fault

156

Communication error between Main and Sub outdoor units. Check comms wiring and power to all outdoor units

157

Sub 3 high pressure sensor fault. Check dc voltage between white and black cable on plug. Multi V: 1 Vdc = 8 bar up to 2.5 Vdc = 37 bar

158

Sub 3 low pressure sensor fault. Check dc voltage between white and black cable on plug. Multi V: 1 Vdc = 4 bar up to 5 Vdc = 32 bar

 

159

Sub 3 outdoor unit air sensor fault. Disconnect from PCB and measure resistance. 8 kOhm at 30C and 13 kOhm at 20C. If OK replace PCB, if not replace sensor

161

Sub 3 outdoor unit suction sensor fault. Disconnect from PCB and measure resistance. 10 kOhm at 10C and 4 kOhm at 30C. if not replace sensor

162

Sub 3 compressor 1 discharge sensor fault. Disconnect from PCB measure resistance 237 kOhm at 20C and 168 kOhm at 30C. if not replace sensor

163

Sub 3 compressor 2 discharge sensor fault. Disconnect from PCB measure resistance 237 kOhm at 20C and 168 kOhm at 30C.if not replace sensor

164

Sub 3 outdoor unit coil sensor A fault. Disconnect from PCB measure resistance. 10 kOhm at 10C and 4 kOhm at 30C. If OK replace PCB, if not replace sensor

165

Sub 3 outdoor unit coil sensor B fault. Disconnect from PCB measure resistance. 10 kOhm at 10C and 4 kOhm at 30C. If OK replace PCB, if not replace sensor

166

Sub 3 outdoor unit liquid pipe sensor fault. Disconnect from PCB and measure resistance. 10 kOhm at 10C and 4 kOhm at 30C

167

Sub 3 outdoor unit Subcool inlet sensor fault. Disconnect from PCB and measure resistance. 10 kOhm at 10C and 4 kOhm at 30C

168

Sub 3 outdoor unit Subcool outlet sensor fault. Disconnect from PCB and measure resistance. 10 kOhm at 10C and 4 kOhm at 30C

169

Sub 3 excessive rise of high pressure. Check pressures, check for non condensables, check heat exchanger coil is free from debris

170

Sub 3 excessive drop of low pressure. Check pressures, check for non condensables, check heat exchanger coil is free from debris

171

Sub 3 check power supply voltage to the outdoor unit is correct (1ph 220 Vac 10% or 3ph 380 Vac 10%). check fuses, if fuses OK replace outdoor main PCB

172

Sub 3 check power supply voltage to the outdoor unit is correct (1ph 220 Vac 10% or 3ph 380 Vac 10%). check fuses, if fuses OK replace outdoor main PCB

173

Main outdoor unit standard compressor not starting. Check output from main PCB, check contactor, and check wiring connections. If OK compressor faulty

174

Sub 1 standard compressor 1 not starting. Check output from main PCB, check contactor, and check wiring connections. If OK compressor faulty

175

Sub 1 standard compressor 2 not starting. Check output from main PCB, check contactor, and check wiring connections. If OK compressor faulty

176

Sub 2 standard compressor 1 not starting. Check output from main PCB, check contactor, and check wiring connections. If OK compressor faulty

177

Sub 2 standard compressor 2 not starting. Check output from main PCB, check contactor, and check wiring connections. If OK compressor faulty

204

Comms Error between Outdoor Unit and HR Box No1. 1. Defective connection in HR unit power supply and transmission connection 2. Wrong setting of the HR unit Rotary switch and Dip switch 3. Defective HR unit PCB

208

Comms Error between Outdoor Unit and HR Box No2. 1. Defective connection in HR unit power supply and transmission connection 2. Wrong setting of the HR unit Rotary switch and Dip switch 3. Defective HR unit PCB

212

Comms Error between Outdoor Unit and HR Box No3. 1. Defective connection in HR unit power supply and transmission connection 2. Wrong setting of the HR unit Rotary switch and Dip switch 3. Defective HR unit PCB

240

Central controller wiring error. Check all comms wiring, including between controller and CNU, and IP addresses. If OK possible defective CNU

241

Central controller data sending error. Either defective CNU or Central controller initialisation failure

242

Central controller data receiving error. Either defective CNU or Central controller initialisation failure

243

Central controller. Comms cable too long or picking up external electrical noise. If OK, mismatching of controllers, or defective CNU

244

Central controller data receiving time out. Either defective CNU or Central controller initialisation failure

245

Central controller data sending time out. Either defective CNU or Central controller initialisation failure

246

Central controller data receiving time out. Either defective CNU or Central controller initialisation failure

250

Central controller data receiving error. Either comms cable picking up external electrical noise, or defective CNU

251

Central controller receiving no data. Either comms cable picking up external electrical noise, or defective CNU

252

Central controller incorrect address error. Check addresses match, if OK either comms cable picking up external electrical noise, or defective CNU

253

Central Controller Disconnection Error, No response from Air Conditioner. Check wiring, if OK either comms cable picking up external electrical noise, defective CNU, or Interface.

C1

Indoor unit return air sensor fault, Open or Short. Disconnect sensor from PCB and measure resistance. 8 kOhm at 30C and 13 kOhm at 20C if not replace sensor

C2

Indoor Pipe Sensor or Outdoor Sensor Assy fault, Open or Short. Disconnect from PCB and measure resistance. Air sensor = 10 kOhm at 25C, Pipe sensor = 5 kOhm at 25C. If not replace sensor.

C4

RAC Product = Heat Sink Sensor Error, Open/Short Cct or over 95C. Commercial Product = Condensate pump float switch risen. Check drain pan is empty, check pump is working OK. If no pump check blue jumper plug is inserted in socket CN Float.

C5

Comms Error, check your wiring, remove external pumps. Split/Multi - check volts from terminal N to 3 = 0 - 65 Vdc, Multi V - 4 Vdc terminals 3 and 4

C6

Inverter compressor run current high. Check compressor windings all equal 1 to 4 Ohms, Check to earth 50 MOhm minimum, check run current

C7

Splits = Compressor Over Current (CT2), also see Code 06.

RAC Indoor unit BLDC Fan problem. This is caused by the Indoor fan being locked. Check fan motor is plugged in correctly, Electrically & Mechanically sound.

C8

Check the fan motor turns freely, check the AC Voltage supplied to the fan motor, this will vary from 120 V ac at low speed to 170V AC at high speed. If no

Voltage is present the the PCB is faulty, if Voltage is present the fan motor will be Faulty.

C9

Outdoor unit fan problem. Check Outdoor fan motor is plugged in, Electrically & Mechanically sound, if not replace motor, otherwise replace PCB.

CA

Compressor discharge sensor fault. Disconnect from PCB measure resistance 237 kOhm at 20C, 168 kOhm at 30C.

CC

RAC Product = EEPROM Sum Check Error, text 60 for help.

Cd

RAC Product = PSC (Reactor) Error, text 27 for help.

CE

RAC Product = Compressor Phase Current Error

CH00

Text the 1, 2 or 3 digit fault code number only. I.e. If you see fault code CH07 on your indoor unit or R/Controller, only type 7 or 07 in your text message.

CH01

Indoor unit return air sensor fault. Disconnect sensor from PCB and measure resistance. 8 kOhm at 30C and 13 kOhm at 20C if not replace sensor

CH02

Indoor Pipe Sensor or Outdoor Sensor Assy fault, Open or Short. Disconnect from PCB and measure resistance. Air sensor = 10 kOhm at 25C, Pipe sensor = 5 kOhm at 25C. If not replace sensor.

CH03

Remote controller comms error. Check wired correctly, if so check dipswitch in RC. Set to Sg for 1 unit, or Gr for group then reset power

CH04

RAC Product = Heat Sink Sensor Error, Open/Short Cct or over 95C. Commercial Product = Condensate pump float switch risen. Check drain pan is empty, check pump is working OK. If no pump check blue jumper plug is inserted in socket CN Float.

CH05

Comms Error, check your wiring, remove external pumps. Split/Multi - check volts from terminal N to 3 = 0 - 65 Vdc, Multi V - 4 Vdc terminals 3 and 4

CH06

Indoor unit coil sensor fault. Disconnect from PCB measure resistance. 10 kOhm at 10C and 4 kOhm at 30C. if not replace sensor. Split = text 21

CH07

Multi Splits and Multi V = indoor unit is set to run in a different mode from the master indoor unit. Set ALL indoor units to cooling or ALL to heating to clear. Splits = Compressor Over Current (CT2), also see Code 06.

RAC Indoor unit BLDC Fan problem. This is caused by the Indoor fan being locked. Check fan motor is plugged in correctly, Electrically & Mechanically sound.

CH08

Check the fan motor turns freely, check the AC Voltage supplied to the fan motor, this will vary from 120 V ac at low speed to 170V AC at high speed. If no

Voltage is present the the PCB is faulty, if Voltage is present the fan motor will be Faulty.

CH09

Split = Outdoor unit fan problem. Check Outdoor fan motor is plugged in, Electrically & Mechanically sound, if not replace motor, otherwise replace PCB. Multi V = indoor PCB failure. Replace PCB

CH10

RAC Product: Compressor discharge sensor fault. Disconnect from PCB measure resistance 237 kOhm at 20C, 168 kOhm at 30C. Multi Fdx & Multi V text 8

CH11

Multi V indoor unit not connected to an outdoor unit. Check comms wiring is correct, and check initialisation has been carried out correctly

CH12

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

CH13

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

CH14

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

CH15

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

CH16

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

 

CH17

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

CH18

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

CH19

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

CH20

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

CH21

Inverter compressor run current high. Check compressor windings all equal 1 to 4 OhmsCheck to earth 50 MOhm minimum, check run current

CH22

Inverter compressor run current high. Check compressor windings all equal 1 to 4 Ohms . Check to earth 50 MOhm minimum, check run current

CH23

Inverter dc voltage low. Check dc voltage of capacitors 300 Vdc for 1Ph and 600 Vdc for 3Ph. If OK change outdoor inverter PCB

CH24

Splits and Multi Splits = High or low pressure trip. Low at 1 bar High at 35 bar check pressures. Multi V = High pressure trip.

CH25

Check power supply voltage to the outdoor unit is correct (1ph ?220 Vac 10% or 3ph ?380 Vac 10%). If OK, check fuses, if fuses are OK replace outdoor main PCB

CH26

Inverter compressor seized. Check compressor windings all equal resistance 1 to 4 Ohms, check to earth 50 MOhm minimum, check run current and Inverter outputs

CH27

Inverter current irregularity. Check inverter PCB and reactor

CH28

Inverter dc voltage too high. Check dc voltage of capacitors 300 Vdc for 1Ph and 600 Vdc for 3Ph. If OK change outdoor inverter PCB

CH29

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

CH30

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

CH31

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

CH32

Inverter compressor discharge temperature too high. If over 105C, check refrigerant charge

CH33

Excessive rise of standard compressor discharge temperature. If over 105C check refrigerant charge

CH34

Excessive high pressure rise, over 35 bar at HP sensor. Check pressures, check coils, and filters are clean check for OFN in system pipework

CH35

Excessive low pressure drop under 1 Bar at LP sensor. Check pressures, and check service valves open

CH36

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

CH37

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

CH38

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

CH39

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

CH40

Inverter ac current abnormal. Check compressor windings all equal resistance 1 to 4 Ohms, check to earth 50 MOhm minimum, check run current and inverter outputs

CH41

Inverter compressor discharge sensor fault. Disconnect from PCB measure resistance 237 kOhm at 20C and 168 kOhm at 30C.

CH42

Low pressure sensor fault. Check dc voltage between white and black cable on plug. Multi V: 1 Vdc = 4 bar up to 5 Vdc = 32 bar

CH43

High pressure sensor fault. Check dc voltage between white and black cable on plug. Multi V: 1 Vdc = 8 bar up to 2.5 Vdc = 37 bar

CH44

Outdoor unit air sensor fault. Disconnect from PCB and measure resistance. 8 kOhm at 30C and 13 kOhm at 20C. If OK replace PCB, if not replace sensor

CH45

Outdoor unit coil sensor fault. Disconnect from PCB measure resistance. 10 kOhm at 10C and 4 kOhm at 30C. If OK replace PCB, if not replace sensor

CH46

Outdoor unit suction sensor fault. Disconnect from PCB and measure resistance. 10 kOhm at 10C and 4 kOhm at 30C. If OK replace PCB, if not replace sensor

CH47

Compressor discharge sensor fault. Disconnect from PCB measure resistance. 237 kOhm at 20C and 168 kOhm at 30C. If OK replace PCB, if not replace sensor

CH48

Split/Multi Split = Outdoor unit discharge and air sensor both unplugged. Multi V = Outdoor unit coil sensor. Text 45 for diagnostics

CH49

Check power supply voltage to the outdoor unit is correct (1ph ?220 Vac 10% or 3ph ?380 Vac 10%). If OK check fuses, if fuses OK, replace outdoor main PCB

CH50

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

CH51

Unit mismatch. Check model number of units do not exceed maximum. Multi V - also check Sub outdoor unit dipswitch settings

CH52

Communication error between inverter PCB and main outdoor unit PCB. Check wiring fuses and LEDs . If OK either inverter or main PCB defective

CH53

Comms error indoor to outdoor unit. Check your wiring . Split and Multi - check voltage from terminal N to 3 = 0 - 65 Vdc, Multi V - 4 Vdc terminals 3 and 4

CH54

Reverse or open phase. Check all 3 phases are present and correct. If correct voltage appears at all three phases, swap any two to cure the fault

CH55

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

CH56

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

CH57

Comms error between outdoor main PCB and inverter PCB. Check wiring fuses and LEDs are lit. If OK either inverter or main PCB defective

CH58

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

CH59

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

CH60

Outdoor unit PCB EEPROM failure, try removing EEPROM and refitting if removable (possible contact fault), otherwise replace PCB if the EEPROM is non-removable.

CH61

Condenser coil over 65C. Check coil and filters are clean and free from debris, and airflow is OK. Check system pressures for non-condesables

CH62

Inverter over 85C. Check air flow across heat sink, check inverter tight to heatsink use thermal paste. Multi V - check inverter cooling fan

CH63

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

CH64

no such fault code Text 1, 2 or 3 digit fault code number only. If you see fault code CH07 only type 7 in your text message

CH65

Outdoor unit inverter fin temperature sensor fault. Disconnect from PCB measure resistance. 8 kOhm at 30C and 13 kOhm at 20C

CH67

Outdoor Fan Motor siezed, or rotation sensing circuit failure. Check motor for mechanical and electrical failure.

CL

CL = Child Lock. Press Timer & Min buttons simultaneously for 5 seconds to engage/disengage function.

help

Text the 1, 2 or 3 digit fault code number only. I.e. If you see fault code CH07 on your indoor unit or R/Controller, only type 7 or 07 in your text message.

HL

Condensate pump float switch risen. Check drain pan is empty, check pump is working OK. If no pump check blue jumper plug is inserted in socket CN Float. Alternatively, Dry Contact Interface is in "OFF" condition. Check status and adjust as necessary.

Po

Po = Jet Cool Mode selected. To cancel press Jet Cool, Fan Speed or Set Temperature button.

 

 

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                                Last updated - 14/08/2013