Daikin Mini-Split Code JC
Warning
Low pressure sensor abnormality. The outdoor unit's low-side pressure transducer is reading out of range.
Manual wording: “JC Low pressure sensor abnormality”
Documented for: RMXS multi-split outdoor units
Likely causes, most common first
- Disconnection of the low pressure sensor connector
- Defective low pressure sensor
- Defective main PCB (A1P)
What you can safely check yourself
- Turn the system off at the breaker or disconnect switch and back on once
When to call a technician
Same as JA - sealed-system sensor, technician only.
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