All LG error codes
This page brings together LG error codes sorted by failure type: what each code means, its likely causes, and what you can safely check before calling a professional.
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The LG codes on this page, grouped by failure type.
low pressure
discharge temperature
fan
Temperature Sensor — LG
These codes indicate a sensor that’s no longer returning a consistent value. The fault almost always comes from the sensor itself or its connector, rarely from the unit.
Code 16Informationair-to-water
Issue with the sensors
Affected models: Therma V
Code 17Informationair-to-water
Issue with the water inlet sensor
Affected models: Therma V
Code 18Informationair-to-water
Issue with the water outlet sensor
Affected models: Therma V
Code 19Informationair-to-water
Issue with the intermediate water sensor
Affected models: Therma V
Code 8Informationair-to-water
Issue with the water tank sensor
Affected models: Therma V
Code CH06Medium severityair-to-air
Indoor unit heat exchanger temperature sensor fault (outlet)
Possible causes
- Faulty outlet thermistor
- Disconnected connector
- Displaced sensor
What you can check
- Cut power for 30 minutes, then restart
Affected models: Standard Plus, ARTCOOL, Dualcool, Libero
This issue requires a qualified technician. Do not open the unit.
Code CH67Medium severityair-to-air
Outdoor fan motor blockage (BLDC)
Possible causes
- Faulty outdoor fan motor
- Blocked blade (ice, obstruction)
- Disconnected motor connector
- Faulty outdoor control board
Affected models: Standard Plus, ARTCOOL, Dualcool
This issue requires a qualified technician. Do not open the unit.
Compressor — LG
The compressor is the main and most expensive component. These codes shut down the unit to protect it before damage occurs: never force repeated restarts.
Code CH26Critical severityair-to-air
Compressor rotor position error (cannot start)
Possible causes
- Seized compressor
- Faulty power module
- Unbalanced pressure at startup
What you can check
- Cut power for 1 hour, then try a single restart
Affected models: Standard Plus, ARTCOOL, Dualcool
This issue requires a qualified technician. Do not open the unit.
Code CH46Medium severityair-to-air
Compressor suction sensor fault
Possible causes
- Faulty suction thermistor
- Disconnected connector
- Damaged wiring
What you can check
- Cut power for 30 minutes, then restart
Affected models: Standard Plus, ARTCOOL, Dualcool
This issue requires a qualified technician. Do not open the unit.
Low Pressure — LG
The refrigerant circuit pressure is too low. This often indicates a refrigerant shortage, meaning there’s a leak to locate.
Code 6Informationair-to-water
Issue with the refrigerant sensor (outlet side)
Affected models: Therma V
This issue requires a qualified technician. Do not open the unit.
Discharge Temperature — LG
The compressor outlet temperature exceeds the safety threshold. This points to a refrigerant shortage or impaired heat exchange.
Code CH41Critical severityair-to-air
Compressor discharge sensor fault
Possible causes
- Faulty discharge sensor
- Disconnected connector
- Actual compressor overheating
What you can check
- Cut off the power — call a technician
Models affected: Standard Plus, ARTCOOL, Dualcool
This issue requires a qualified technician. Do not open the unit.
Fan — LG
The fan expels or draws in heat. If it’s blocked or faulty, pressure rises and triggers a shutdown.
Code CH53Medium severityair-to-air
Indoor/outdoor unit communication fault (detected by the outdoor unit)
Possible causes
- Connecting cable poorly connected or cut
- Faulty indoor or outdoor board
Models affected: Standard Plus, ARTCOOL, Dualcool
This issue requires a qualified technician. Do not open the unit.
All LG codes published on the site
This list updates itself automatically whenever a new guide is added.
Technical information provided for guidance only, based on manufacturer documentation and field feedback. It does not replace the diagnosis of a qualified professional. Found an error on this page? Report it.