Error code = C4 or CH4
Flashing Light = 4
Fault = Heat sink temperature sensor open or closed circuit.
Display = Indoor Outdoor.
Indoor Operation = ON

Error code = C5 or CH5
Flashing Light = 5
Fault = Communication between indoor and outdoor units.
Display = Indoor Outdoor
Indoor Operation = OFF

Error code = C6 or CH6
Flashing Light = 6
Fault = Excessive current at inverter DC power circuit.
Display = Indoor Outdoor
Indoor Operation = SHUTDOWN

Error code = C7 or CH7
Flashing Light = Excessive compressor current
Fault = 7
Display = Indoor Outdoor
Indoor Operation = SHUTDOWN

Error code = C8 or CH8
Flashing Light = 8
Fault = Indoor fan not rotating.
Display = Indoor
Indoor Operation = OFF

Error code = C9 or CH9
Flashing Light = 9
Fault = Outdoor fan not rotating.
Display = Indoor Outdoor
Indoor Operation = OFF

Error code = CA
Flashing Light = 10
Fault = 1. Discharge temp more than130 °C 2. Faulty discharge thermistor
Display = Indoor Outdoor
Indoor Operation = ON

Error code = CC
Flashing Light = 2+1
Fault = EEPROM error
Display = Outdoor
Indoor Operation = ON

Error code = CD
Flashing Light = 3+1
Fault = Inverter module error
Display = Outdoor
Indoor Operation = ON

Error code = Po
Flashing Light =
Fault = System in Power Mode – not a fault
Display = Indoor
Indoor Operation =

Error code = Lo
Flashing Light =
Fault = System in test mode – not a fault
Display = Indoor
Indoor Operation =


LG Air Conditioning Universal & Multi Split Fault Codes Sheet

Error Code = 01
Contents = Air sensor (open/short)
Case Of Error = Open / Short circuit
Indoor Status = Off

Error Code = 02
Contents = Inlet pipe sensor
Case Of Error = Open / Short circuit
Indoor Status = Off

Error Code = 03
Contents = Communication(Indoor Wired R/Control)
Case Of Error = Communication Poorly
Indoor Status = Off

Error Code = 04
Contents = Drain pump / Float switch
Case Of Error = Float switch Open circuit (High level water alarm)
Indoor Status = Off

Error Code = 05
Contents = Communication(Indoor Outdoor)
Case Of Error = Communication Poorly
Indoor Status = Off

Error Code = 06
Contents = Outlet pipe sensor
Case Of Error = Open / Short circuit
Indoor Status = Off

Error Code = 07
Contents = Different operation mode
Case Of Error = Indoor units set in different operation modes
Indoor Status = Off

Error Code = HL
Contents = High Limit (Float Switch)
Case Of Error = Same as code 04, Float switch Open circuit
Indoor Status = Off


Error Code = CL
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


Error Code = 21
Contents = IPM Fault (Compressor Over current)
LED01G = 2 times
(Red) 
LED02G = 1 time
(Green)
Case Of Error = Compressor malfunction, IPM Fault
Outdoor Status = Off

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

Error Code = 23
Contents = DC Link Low Volt.
LED01G = 2 times
(Red) 
LED02G = 3 times
(Green)
Case Of Error = DC Link volt. Is 140V 
Outdoor Status = Off


Error Code = 24
Contents = Low / High Pressure
LED01G = 2 times
(Red) 
LED02G = 4 times
(Green)
Case Of Error = Low / High press switch OPEN
Outdoor Status = Off

Error Code = 25
Contents = AC Low / AC High Volts.
LED01G = 2 times
(Red) 
LED02G = 5 times
(Green)
Case Of Error = Abnormal AC volt. Input.
Outdoor Status = Off

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

Error Code = 27
Contents = PSC Fault (Reactor)
LED01G = 2 times
(Red) 
LED02G = 7 times
(Green)
Case Of Error =
Outdoor Status = Off

Error Code = 28
Contents = DC Link High Volts
LED01G = 2 times
(Red) 
LED02G = 8 times
(Green)
Case Of Error = Off
Outdoor Status = Off

Error Code = 32
Contents = Discharge Pipe Temp. High (INV)
LED01G = 3 times
(Red) 
LED02G = 2 times
(Green)
Case Of Error = Off
Outdoor Status = Off

Error Code = 33
Contents = Discharge Pipe Temp. High (Cons.)
LED01G = 3 times
(Red) 
LED02G = 3 times
(Green)
Case Of Error = Off
Outdoor Status = Off

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

Error Code = 41
Contents = D-Pipe sensor INV. (Open/Short)
LED01G = 4 times
(Red) 
LED02G = 1 time
(Green)
Case Of Error = Open / Short circuit.
Outdoor Status = Off

Error Code = 44
Contents = Air sensor (Open/Short)
LED01G = 4 times
(Red) 
LED02G = 4 times
(Green)
Case Of Error = Open / Short circuit.
Outdoor Status = Off

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

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

Error Code = 47
Contents = D-pipe Sensor Cons. (Open/Short)
LED01G = 4 times
(Red) 
LED02G = 7 times
(Green)
Case Of Error = Open / Short circuit
Outdoor Status = Off

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

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

Error Code = 52
Contents = Communication Error (Main micom Sub micom)
LED01G = 5 times
(Red) 
LED02G = 2 times
(Green)
Case Of Error = Poor/Loss of Communication
Outdoor Status = 0ff

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

Error Code = 54
Contents = Outdoor 3-Phase Power Supply Reverse Phase / Missing Phase
LED01G = 5 times
(Red) 
LED02G = 4 times
(Green)
Case Of Error = Incorrect Wiring
Outdoor Status = Off

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

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

Error Code = 62
Contents = Heat Sink Sensor Temp. High
LED01G = 6 times
(Red) 
LED02G = 2 times
(Green)
Case Of Error = Heat Sink Temp. High
Outdoor Status = Off

Error Code = 63
Contents = Cond. Pipe Sensor Temp. Low
LED01G = 6 times
(Red) 
LED02G = 2 times
(Green)
Case Of Error = Cond. Temp. Low
Outdoor Status = Off

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

Error Code = 67
Contents = Outdoor BLDC Fan Loc
LED01G = 6 times
(Red) 
LED02G = 7 times
(Green)
Case Of Error = Fan Motor/Circuit Problem
Outdoor Status = Off

Error Code = 105
Contents = Comms. Error (Main board Fan board)
LED01G = 6 times
(Red) 
LED02G = 5 times
(Green)
Case Of Error = Poor/Loss of Communication
Outdoor Status = Off