DIY HVAC Tools

LG mini split error codes

LG residential ductless systems show CH codes on the indoor display (CH05, CH38). LG builds its own platform.

Covers: Art Cool, Standard, Mega, Multi F.

Type it exactly as the unit shows it. Not sure which brand? It is printed on the front of the indoor unit.

Most looked-up LG codes

CH05Communication error between indoor and outdoor unitsCH38Refrigerant leak detected (low charge)CH10Indoor fan motor fault (locked or no feedback)CH21Inverter DC peak (IPM over-current)CH01Indoor air (room) temperature sensor fault (open or short circuit)CH26DC compressor position error (start failure)CH53Communication error between indoor and outdoor unitsCH61Condenser pipe temperature too high

All LG codes

37 codes. Type to filter the list.

CodeMeaningTypeFix
CH01Indoor air (room) temperature sensor fault (open or short circuit)FaultDIY checks
CH02Indoor inlet pipe temperature sensor fault (open or short circuit)FaultDIY checks
CH03Communication error with the wired remote controllerFaultDIY checks
CH04Drain pump or float switch faultFaultDIY
CH05Communication error between indoor and outdoor unitsFaultDIY checks
CH06Indoor outlet pipe temperature sensor fault (open or short circuit)FaultDIY checks
CH07Operating mode conflict (multi-split)ProtectionDIY
CH09Indoor unit EEPROM errorFaultTechnician
CH10Indoor fan motor fault (locked or no feedback)FaultDIY checks
CH21Inverter DC peak (IPM over-current)ProtectionTechnician
CH22AC input over-current (CT2)ProtectionDIY checks
CH23DC link low voltageProtectionDIY checks
CH24High or low pressure switch operatedProtectionDIY checks
CH25Abnormal input voltage (over or under)ProtectionDIY checks
CH26DC compressor position error (start failure)ProtectionTechnician
CH27PSC (power factor) circuit faultProtectionTechnician
CH28DC link high voltageProtectionDIY checks
CH29Compressor over-currentProtectionTechnician
CH32Discharge temperature too highProtectionDIY checks
CH34High pressure too high (pressure sensor)ProtectionDIY checks
CH35Low pressure too low (pressure sensor)ProtectionDIY checks
CH38Refrigerant leak detected (low charge)FaultDIY checks
CH40Current sensor (CT) circuit faultFaultTechnician
CH41Compressor discharge pipe temperature sensor fault (open or short circuit)FaultDIY checks
CH44Outdoor air temperature sensor fault (open or short circuit)FaultDIY checks
CH45Outdoor condenser (middle) pipe temperature sensor fault (open or short circuit)FaultDIY checks
CH46Outdoor suction pipe temperature sensor fault (open or short circuit)FaultDIY checks
CH51Over-capacity (too many indoor units)FaultDIY checks
CH52Communication error between outdoor main and inverter boardsFaultTechnician
CH53Communication error between indoor and outdoor unitsFaultDIY checks
CH60Outdoor unit EEPROM errorFaultTechnician
CH61Condenser pipe temperature too highProtectionDIY checks
CH62Inverter heat sink temperature too highProtectionDIY checks
CH65Inverter heat sink temperature sensor faultFaultDIY checks
CH67Outdoor fan motor lockedFaultDIY checks
CH73AC input instantaneous over-currentProtectionDIY checks
CLChild lock activeStatusDIY

How LG shows error codes

The indoor display shows CH followed by a number (CH05, CH38). Units without a display blink the indicator lamps in a pattern; the outdoor board LEDs blink the same number. If someone tells you 'CH 5', that is CH05. CH01 to CH12 are indoor-unit faults, CH21 to CH29 are inverter and compressor faults, CH32 to CH38 are refrigerant-side protections, CH40 to CH48 are outdoor sensors, and CH51 to CH73 are outdoor-unit system faults.

Sources

  • LG residential split service manuals (error code tables)

Updated September 2026. Manufacturer site: www.lg.com/us/hvac