Daikin Mini-Split Code J7
Warning
Outdoor liquid pipe thermistor (R7T) abnormality. A short or open circuit was detected in the outdoor liquid line temperature sensor.
Manual wording: “J7 Outdoor liquid pipe thermistor (R7T) abnormality”
Documented for: RMXS multi-split outdoor units
Likely causes, most common first
- Disconnection of thermistor
- Defective outdoor liquid pipe thermistor (R7T)
- 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
The sensor plugs into X13A on the outdoor main PCB - reconnecting or replacing it is technician work.
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