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Published guidance

Ductless air conditioners error codes

HVAC service procedures remain reserved for qualified professionals.

14 of 14 published codes. Symptom matches help you find relevant guidance; they do not identify a fault without the displayed code and model.

LG · Ductless air conditioner

CH05 — meaning and next steps

LG CH05 indicates a communication error between the indoor and outdoor units of a covered inverter air conditioner.

LG · Ductless air conditioner

CH07 — meaning and next steps

LG CH07 indicates conflicting heating and cooling modes across connected 2-in-1 or ceiling-type air-conditioning units.

LG · Ductless air conditioner

CH53 — meaning and next steps

LG CH53 indicates a communication error between the indoor and outdoor units of a covered inverter air conditioner.

LG · Ductless air conditioner

CH54 — meaning and next steps

LG CH54 is a reverse-phase detection display that may follow a power outage or electrical work.

LG · Ductless air conditioner

CH61 — meaning and next steps

LG CH61 is an overheating-protection display for the outdoor unit in cooling or the indoor unit in heating.

LG · Ductless air conditioner

CH66 — meaning and next steps

LG CH66 indicates a communication-line or piping-connection issue between indoor and outdoor units.

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