LG error code CH09
What it means
Indoor unit EEPROM or memory error.
Possible causes
Corrupted indoor memory data Power interruption during EEPROM write Incompatible or incorrectly programmed replacement PCB
Suggested fix
Perform a full power reset at the isolator and, if the error recurs, replace the indoor PCB and program all required parameters following LG service documentation.
Safety first. Isolate the power supply before inspecting any unit. Refrigerant-circuit
and electrical repairs must be carried out by a qualified, registered technician.
Other LG codes
- CH01 — Indoor air (room) temperature sensor fault.
- CH02 — Indoor pipe (coil) temperature sensor fault.
- CH03 — Drain pump or condensate removal error.
- CH05 — Communication fault between the indoor and outdoor unit.
- CH10 — Indoor fan motor fault or abnormal fan operation.
- CH21 — Outdoor DC compressor IPM (inverter power module) fault.
- CH22 — Outdoor current transformer (CT) error.
- CH23 — Outdoor DC compressor overcurrent protection.
- CH61 — High temperature protection in outdoor unit (cooling) or indoor unit (heating).
- CH67 — Outdoor fan motor fault.