LG FAULT CODES

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.

08 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.
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.

8 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.
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 20°C, 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 105°C, check refrigerant charge.

33 Excessive rise of standard compressor discharge temperature.
If over 105°C 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 20°C and 168 kOhm at 30°C.

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 10°C and 4 kOhm at 30°C.
If OK replace PCB, if not replace sensor.

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

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

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 nonremovable.

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

62 Inverter over 85°C. 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 30°C and 13 kOhm at 20°C.

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 105°C Sub condenser 1 standard compressor. Check refrigerant.

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

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

103 Excessive discharge temperature rise 105°C 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 10°C and 4 kOhm at 30°C.

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

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

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 30°C and 13 kOhm at 20°C.
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 10°C and 4 kOhm at 30°C.
if not replace sensor.

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

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

123 Sub 1 outdoor unit coil sensor A fault.
Disconnect from PCB measure resistance.
10 kOhm at 10°C and 4 kOhm at 30°C.
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 10°C and 4 kOhm at 30°C.
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 10°C and 4 kOhm at 30°C.

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

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

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 30°C and 13 kOhm at 20°C.
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 10°C and 4 kOhm at 30°C.
if not replace sensor.

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

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

135 Sub 2 outdoor unit coil sensor A fault.
Disconnect from PCB measure resistance.
10 kOhm at 10°C and 4 kOhm at 30°C.
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 10°C and 4 kOhm at 30°C.
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 10°C and 4 kOhm at 30°C.

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

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

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 105°C Sub condenser 2 standard compressor. Check refrigerant.

153 Excessive discharge temperature rise 105°C 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 30°C and 13 kOhm at 20°C.
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 10°C and 4 kOhm at 30°C.
if not replace sensor.

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

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

164 Sub 3 outdoor unit coil sensor A fault.
Disconnect from PCB measure resistance.
10 kOhm at 10°C and 4 kOhm at 30°C.
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 10°C and 4 kOhm at 30°C.
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 10°C and 4 kOhm at 30°C.

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

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

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.

C8 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.
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 20°C, 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.

CH08 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.
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 20°C, 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 105°C, check refrigerant charge.

CH33 Excessive rise of standard compressor discharge temperature.
If over 105°C 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 30°C and 13 kOhm at 20°C.
If OK replace PCB, if not replace sensor.

CH45 Outdoor unit coil sensor fault.
Disconnect from PCB measure resistance.
10 kOhm at 10°C and 4 kOhm at 30°C.
If OK replace PCB, if not replace sensor.

CH46 Outdoor unit suction sensor fault.
Disconnect from PCB and measure resistance.
10 kOhm at 10°C and 4 kOhm at 30°C.
If OK replace PCB, if not replace sensor.

CH47 Compressor discharge sensor fault.
Disconnect from PCB measure resistance.
237 kOhm at 20°C and 168 kOhm at 30°C.
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 nonremovable.

CH61 Condenser coil over 65°C.
Check coil and filters are clean and free from debris, and airflow is OK.
Check system pressures for non-condesables.

CH62 Inverter over 85°C.
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 30°C and 13 kOhm at 20°C.

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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