LG error codes, explained

LG mini-split and multi-split systems. Codes below: CH codes (CH 05…). Each guide covers what the code means, what you can safely try yourself, when to stop and call a technician, and what the repair typically costs.

LG CH 05 — Indoor/outdoor communication error

LG's communication fault between indoor and outdoor units — same family as Mitsubishi E6 and Daikin U4. Wiring, power, or board.

Try DIY first — may need a pro

LG CH-code family — What the numbers mean

LG faults display as CH + a number: low numbers cover sensors and communication, others cover fan motors, refrigerant conditions, and protection stops. The exact map is model-specific, but the triage is universal: record the code, power cycle once, and match the code to your model's manual before anyone opens a panel.

Try DIY first — may need a pro