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LG Therma V fault codes

55 codes from the LG manual for the Therma V heat pump. Pick one for what it means, the likely causes and where to start.

CodeWhat it means
03Communication error between indoor unit and wired remote controller
05Communication error between main PCB(indoor) and main PCB(outdoor cycle)
14Problem in flow rate
15Overheating of water pipe
232Problem in flow sensor
26No position error
29Comp over current
40Inv comp CT sensor error
52Inv PCB(outdoor) - main PCB(outdoor cycle) communication error
53Main PCB(indoor) - main PCB(outdoor) communication error
57Main PCB(indoor) → inv PCB(outdoor) communication error
60Outdoor EEPROM error
67Fan lock error
CH01Room air temperature sensor fault
CH02Inlet pipe temperature sensor fault
CH03Bad communication between remote controller and indoor unit
CH05Bad communication between outdoor unit and indoor unit
CH08DHW tank temperature sensor fault
CH09PCB program (EEPROM) fault
CH114Injection in sensor error
CH115Injection out sensor error
CH13DHW tank temperature sensor fault
CH14Problem in flow rate
CH15Water pipe strange overheat
CH16Problems in sensors (heater water temperature sensor error)
CH17Problem in water-outlet sensor
CH18Backup heater water outlet temperature sensor fault
CH19Backup heater water outlet temperature sensor fault
CH20Electric heater strange overheat
CH21PCBA NG (fault finding function result)
CH22Max. C/T, power input of inv PCB(outdoor) is exceeded
CH23DC link low volt
CH231Reference table correlating water pressure (bar) to expected sensor output voltage (V)...
CH232Reference table correlating water flow rate (l/min) to expected sensor output voltage...
CH24High pressure error
CH26Compressor NG (fault finding function result)
CH27PSC / PFC fault error
CH29PCBA OK (fault finding function result)
CH32High temperature in discharge pipe of the inverter compressor
CH35Low pressure error
CH41D-pipe sensor (inverter) open/short
CH43Sensor error of high pressure
CH44Air sensor open/short
CH45Condenser mid pipe sensor open/short
CH46Suction pipe sensor open/short
CH48Const-D-pipe sensor error
CH52Communication error inv PCB(outdoor) ↔ main PCB(outdoor cycle)
CH53Bad communication between outdoor unit and indoor unit
CH54RST reverse phase detection error
CH60Outdoor EEPROM error
CH61High temperature in cond. pipe
CH62Heat sink temp, high error
CH65Heatsink temp. sensor open/short
CH67Outdoor fan lock
U3Reactor PCB / IGBTM (IPM) abnormality (3Ø, 12/14/16 kW)