Daikin Mini-Split Code CJ
Warning
Remote controller thermistor abnormality. The temperature sensor built into the wired wall controller read open or shorted. The system can keep running using the indoor unit's own sensor.
Manual wording: “CJ Remote controller thermistor abnormality”
Documented for: Systems using a wired wall remote controller
Likely causes, most common first
- Defective room temperature thermistor in the wired remote controller
- Defective wired remote controller PCB
- External factor such as noise
What you can safely check yourself
- Turn the system off at the breaker or disconnect switch and back on once and see whether CJ comes back
When to call a technician
If CJ keeps returning the wired controller needs replacing. Note the room temperature it senses will be off until then.
A Daikin mini-split throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.
Source
- Service Manual - Multi-Split Type Air Conditioners RMXS-L Series (SiUS181631EA) (Daikin, RMXS48LVJU outdoor, BPMKS048A2U/049A3U branch provider, CTXG/CTXS/FTXS/CDXS/FDXS/FVXS/FFQ indoor units) · checked 2026-08-25