As a through-the-wall air conditioner, the LT1214CNR 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 flags this exact model discontinued (read 24 September 2026); it is out of production but not out of the field, and it is exactly the kind of model that has nowhere else to turn for support.
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
- Through-the-wall air conditioner
Most Common Issues on This Model
CH21 fault code — listed CH-prefixed fault on LG room air conditioners
CH29 fault code — listed CH-prefixed fault on LG room air conditioners
CH53 fault code — listed CH-prefixed fault on LG room air conditioners