LG Multi Split Units Error Code

LG Air Conditioning Multi F(DX) Fault Codes Sheet

Multi Split Units
If there is a fault on any LG Multi unit, an Error mark is indicated on the display window of the indoor unit, wired-remote controller, and LED’s of outdoor unit control board.
A two digit number will appear on the wired remote controllers LCD display, e.g. CH05. If the unit does not have a wired remote the fault will be displayed using the LED's on the front of the indoor unit.
If more than two troubles occur simultaneously, the lower numbered error code is displayed first.
After an error occurs, if error is released, error LED is also released simultaneously.
Error IndicatorIndoor unit faults = CH01 or C1
Fascia LED’s
- RED = None
- GREEN = 1 Flash
Contents = Indoor Air Sensor (Open/Short)
Case of Error = Open or Short Circuit
Indoor Status = Off

Indoor unit faults = CHO2 or C2
Fascia LED’s
- RED = None
- GREEN = 2 Flash
Contents = Inlet Pipe Sensor
Case of Error = Open or Short Circuit
Indoor Status = Off

Indoor unit faults = CH03 or C3
Fascia LED’s
- RED = None
- GREEN = 3 Flash
Contents = Communication (Indoor Wired R/Control)
Case of Error = Data Communication Fault
Indoor Status = Off

Indoor unit faults = CH04 or C4
Fascia LED’s
- RED = None
- GREEN = 4 Flash
Contents = Drain Pump / Float Switch
Case of Error = Float Switch Open Circuit (High Level Water Alarm)
Indoor Status = Off

Indoor unit faults = CH05 or C5
Fascia LED’s
- RED = None
- GREEN = 5 Flash
Contents = Communication Error (Indoor Outdoor)
Case of Error = Data Communication Fault
Indoor Status = Off

Indoor unit faults = CH06 or C6
Fascia LED’s
- RED = None
- GREEN = 6 Flash
Contents = Outlet Pipe Sensor
Case of Error = Open or Short Circuit
Indoor Status = Off

Indoor unit faults = CH07 or C7
Fascia LED’s
- RED = None
- GREEN = 7 Flash
Contents = Different Operation Mode
Case of Error = Indoor Unit is Set in Different Cool/Heat Operation Mode
Indoor Status = Off

Indoor unit faults = CH09 or C9
Fascia LED’s
- RED = None
- GREEN = 9 Flash
Contents = EEPROM Check Sum
Case of Error = Check Sum Mis-matching
Indoor Status = Off

Indoor unit faults = CH10 or CA
Fascia LED’s
- RED = 1 Flash
- GREEN = None
Contents = BLDC Fan Motor Lock
Case of Error = Fan Motor not Operating
Indoor Status = Off

Indoor unit faults = HL
Fascia LED’s
- RED =
- GREEN =
Contents = High Limit (Float Switch) or Hard Lock
Case of Error = Same as CH 04 (Float Switch Open Circuit) or Unit under Central Control
Indoor Status = Off

Indoor unit faults = CL
Fascia LED’s
- RED =
- GREEN =
Contents = Child Lock Function Selected
Case of Error = Not an Error, Press Timer & Min Buttons Simultaneously for 3 seconds to Toggle On/Off
Indoor Status = On

Indoor unit faults = Po
Fascia LED’s
- RED =
- GREEN =
Contents = Jet Cool Mode Selected
Case of Error = Not an Error, Press Jet Cool Button to Toggle On/Of
Indoor Status = On

Indoor unit faults = Lo
Fascia LED’s
- RED =
- GREEN =
Contents = System in Test Mode
Case of Error = Not an Error
Indoor Status = On


Outdoor Unit Faults can also be read from the outdoor unit PCB using the flashing LED’s as below:

Error code = 21
Contents = IPM Fault (Compressor Over Current)
LED01G (Red) = 2 times
LED02G (Green) = 1 time
Case of Error = Compressor Malfunction, IPM Fault
Outdoor Status = Off

Error code = 22
Contents = CT 2 (Max. Current)
LED01G (Red) = 2 times
LED02G (Green) = 2 times
Case of Error = Current is 14A
Outdoor Status = Off

Error code = 23
Contents = DC Link Low Volt
LED01G (Red) = 2 times
LED02G (Green) = 3 times
Case of Error = DC Link Voltage is 140V
Outdoor Status = Off

Error code = 24
Contents = Low / High Pressure
LED01G (Red) = 2 times
LED02G (Green) = 4 times
Case of Error = Low / High Press Switch OPEN Circuit
Outdoor Status = Off

Error code = 25
Contents = AC Low / AC High Volts
LED01G (Red) = 2 times
LED02G (Green) = 5 times
Case of Error = Abnormal AC Input Voltage (140V , 300V )
Outdoor Status = Off

Error code = 26
Contents = DC Compressor Position
LED01G (Red) = 2 times
LED02G (Green) = 6 times
Case of Error = Position Detection Error
Outdoor Status = Off

Error code = 27
Contents = PSC Fault (Reactor)
LED01G (Red) = 2 times
LED02G (Green) = 7 times
Case of Error = Over Current at “IGBT”
Outdoor Status = Off

Error code = 28
Contents = DC Link High Volts
LED01G (Red) = 2 times
LED02G (Green) = 8 times
Case of Error = DC Link Voltage is 420V
Outdoor Status = Off

Error code = 32
Contents = Discharge Pipe Temp. High (INV. Compressor)
LED01G (Red) = 3 times
LED02G (Green) = 2 times
Case of Error = Discharge Sensor High Temp. (105oC )
Outdoor Status = Off

Error code = 33
Contents = Discharge Pipe Temp. High (Cons. Compressor)
LED01G (Red) = 3 times
LED02G (Green) = 3 times
Case of Error = Discharge Sensor High Temp. (105oC )
Outdoor Status = Off

Error code = 40
Contents = CT Circuit
LED01G (Red) = 4 times
LED02G (Green) =
Case of Error = CT Circuit malfunction Off
Outdoor Status = Off

Error code = 41
Contents = D-Pipe Sensor INV. Compressor (Open/Short)
LED01G (Red) = 4 times
LED02G (Green) = 1 times
Case of Error = Open / Short Circuit
Outdoor Status = Off

Error code = 44
Contents = Air Sensor (Open/Short
LED01G (Red) = 4 times
LED02G (Green) = 4 times
Case of Error = Open / Short circuit
Outdoor Status = Off

Error code = 45
Contents = Cond. Pipe Sensor (Open/Short)
LED01G (Red) = 4 times
LED02G (Green) = 5 times
Case of Error = Open / Short circuit
Outdoor Status = Off

Error code = 46
Contents = Suction Pipe Sensor (Open/Short)
LED01G (Red) = 4 times
LED02G (Green) = 6 times
Case of Error = Open / Short circuit
Outdoor Status = Off

Error code = 47
Contents = D-Pipe Sensor Cons. Compressor (Open/Short)
LED01G (Red) = 4 times
LED02G (Green) = 7 times
Case of Error = Open / Short circuit
Outdoor Status = Off

Error code = 48
Contents = D-Pipe & Air Sensor (Open)
LED01G (Red) = 4 times
LED02G (Green) = 8 times
Case of Error = Dual Sensor unplugged
Outdoor Status = Off

Error code = 51
Contents = Over Capacity
LED01G (Red) = 5 times
LED02G (Green) = 1 times
Case of Error = Over Capacity Combination
Outdoor Status = Off

Error code = 53
Contents = Communication Error (Indoor Outdoor)
LED01G (Red) = 5 times
LED02G (Green) = 3 times
Case of Error = Poor/Loss of Communication
Outdoor Status = Off

Error code = 60
Contents = EEPROM Check Sum
LED01G (Red) = 6 times
LED02G (Green) =
Case of Error = Check Sum Mis-Match
Outdoor Status = Off

Error code = 61
Contents = Cond. Pipe Sensor Temp
LED01G (Red) = 6 times
LED02G (Green) = 1 time
Case of Error = Cond. Temp. High (65oC )
Outdoor Status = Off

Error code = 62
Contents = Heat Sink Sensor Temp
LED01G (Red) = 6 times
LED02G (Green) = 2 times
Case of Error = Heat Sink Temp. High (85oC )
Outdoor Status = Off

Error code = 65
Contents = Heat Sink Sensor (Open/Short)
LED01G (Red) = 6 times
LED02G (Green) = 5 times
Case of Error = Open / Short circuit
Outdoor Status = Off

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