As a window air conditioner, the LW8017ERSM shares its core mechanism with the rest of LG’s air conditioner lineup. On this platform, the CH21 fault code is one of the more common reasons it gets a service call. LG’s own US product page still carries this model with an active status flag, read 24 September 2026.
Service calls on this air conditioner most often trace to one of a short list: the CH21, CH29 or CH53 fault codes. We confirm which one applies against the model and serial number before ordering a part.
Key Features
- Programmable on/off timer
- Electronic thermostat control with a digital display
- Window air conditioner
Most Common Issues on This Model
01
CH21 fault code — listed CH-prefixed fault on LG room air conditioners
02
CH29 fault code — listed CH-prefixed fault on LG room air conditioners
03
CH53 fault code — listed CH-prefixed fault on LG room air conditioners