The LW1821ERSM is an LG window air conditioner. Current model — LG’s own US product page still carries this model with an active status flag, read 24 September 2026. On this platform, the CH10 fault code is one of the more common reasons it gets a service call.
Service calls on this air conditioner most often trace to one of a short list: the CH10, CH21 or CH29 fault codes. We confirm which one applies against the model and serial number before ordering a part.
Key Features
- Electronic thermostat control with a digital display
- Multi-speed fan control
- Window air conditioner
- Sold in 2 finish options on this platform
Most Common Issues on This Model
01
CH10 fault code — listed CH-prefixed fault on LG room air conditioners
02
CH21 fault code — listed CH-prefixed fault on LG room air conditioners
03
CH29 fault code — listed CH-prefixed fault on LG room air conditioners