LG Air Conditioner Multi Split Units Fault Codes

There might be a lot of causes of air conditioner malfunctions; the main ones are listed in the table. You can find tips for troubleshooting next to the symptoms of the problem. Some troubleshooting procedures can be unsafe.

If more than two troubles occur simultaneously, the lower numbered error code is displayed first.

Indoor unit faultsFascia LED’s
Fascia LED’s
ContentsCase of ErrorIndoor Status
CH01 or C1None1 FlashIndoor Air Sensor (Open/Short)Open or Short CircuitOff
CHO2 or C2 (error solution CHO2 or C2)None2 FlashInlet Pipe SensorOpen or Short CircuitOff
CH03 or C3None3 FlashCommunication (Indoor Wired R/Control)Data Communication FaultOff
CH04 or C4None4 FlashDrain Pump / Float SwitchFloat Switch Open Circuit (High Level Water Alarm)Off
CHO5 or C5 (error solution CHO5 or C5)None5 FlashCommunication Error (Indoor Outdoor)Data Communication FaultOff
CH06 or C6None6 FlashOutlet Pipe SensorOpen or Short CircuitOff
CH07 or C7None7 FlashDifferent Operation ModeIndoor Unit is Set in Different Cool/Heat Operation ModeOff
CH09 or C9None9 FlashEEPROM Check SumCheck Sum Mis-matchingOff
CH10 or CA1 FlashNoneBLDC Fan Motor LockFan Motor not OperatingOff
HLHigh Limit (Float Switch) or Hard LockSame as CH 04 (Float Switch Open Circuit) or Unit under Central ControlOff
CLChild Lock Function SelectedNot an Error, Press Timer & Min Buttons Simultaneously for 3 seconds to Toggle On/OffOn
PoJet Cool Mode SelectedNot an Error, Press Jet Cool Button to Toggle On/OfOn
LoSystem in Test ModeNot an ErrorOn
212 times1 timeIPM Fault (Compressor Over Current)Compressor Malfunction, IPM FaultOff
222 times2 timesCT 2 (Max. Current)Current is 14AOff
232 times3 timesDC Link Low VoltDC Link Voltage is 140VOff
242 times4 timesLow / High PressureLow / High Press Switch OPEN CircuitOff
252 times5 timesAC Low / AC High VoltsAbnormal AC Input Voltage (140V , 300V )Off
262 times6 timesDC Compressor PositionPosition Detection ErrorOff
272 times7 timesPSC Fault (Reactor)Over Current at “IGBT”Off
282 times8 timesDC Link High VoltsDC Link Voltage is 420VOff
323 times2 timesDischarge Pipe Temp. High (INV. Compressor)Discharge Sensor High Temp. (105oC )Off
333 times3 timesDischarge Pipe Temp. High (Cons. Compressor)Discharge Sensor High Temp. (105oC )Off
404 timesCT CircuitCT Circuit malfunction OffOff
414 times1 timesD-Pipe Sensor INV. Compressor (Open/Short)Open / Short CircuitOff
444 times4 timesAir Sensor (Open/ShortOpen / Short circuitOff
454 times5 timesCond. Pipe Sensor (Open/Short)Open / Short circuitOff
464 times6 timesSuction Pipe Sensor (Open/Short)Open / Short circuitOff
474 times7 timesD-Pipe Sensor Cons. Compressor (Open/Short)Open / Short circuitOff
484 times8 timesD-Pipe & Air Sensor (Open)Dual Sensor unpluggedOff
515 times1 timesOver CapacityOver Capacity CombinationOff
535 times3 times Communication Error (Indoor Outdoor)Poor/Loss of CommunicationOff
606 timesEEPROM Check SumCheck Sum Mis-MatchOff
616 times1 timesCond. Pipe Sensor TempCond. Temp. High (65oC )Off
626 times2 timesHeat Sink Sensor TempHeat Sink Temp. High (85oC )Off
656 times5 timesHeat Sink Sensor (Open/Short)Open / Short circuitOff