LG AIR CONDITIONER
ERROR CODES AND DESCRIPTION
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
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
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
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
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.
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.
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.
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.
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
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
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
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.
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.
