Daikin Mini-Split Code J8
Warning
Liquid pipe thermistor or related abnormality. The liquid line temperature sensor at the outdoor unit is reading open or shorted.
Manual wording: “J8 Liquid pipe thermistor or related abnormality”
Documented for: FTXM-W/V (Daikin Atmosphera) outdoor units
Likely causes, most common first
- Disconnection of the connector for the thermistor
- Defective thermistor
- Defective outdoor unit PCB
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
A technician has to check the thermistor's resistance and connector inside the outdoor unit.
A Daikin mini-split throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.
Source
- Service Manual - Inverter Pair Wall Mounted Type FTXM-W/V Series (SiUS042113EA) (Daikin, FTXM-W / FTXM-V (Daikin Atmosphera) wall-mount heat pump) · checked 2026-08-25