LG wall-mounted Inverter air conditioners (RAC) – CH codes
LG · Split air conditioners · 4 codes · 4 with plain-language explanation
Guides
- LG air conditioner shows a CH code – how to do a power reset and when to call service
The error may be temporary, caused by power instability. The manual describes a power reset; if the same code persists, a technician must inspect the unit.
Error codes
- CH54 Reverse phase detection error with plain-language explanation
- CH66 Communication line or piping connection issue between indoor and outdoor units with plain-language explanation
- CH90 Test-run protection (piping connections) with plain-language explanation
- CH91 Test-run protection (piping connections) with plain-language explanation