What It Means
Malfunction of thermistor in switch box.
Daikin Split & Multi-Split
Daikin Split & Multi-Split Error Code P3
Troubleshooting guide for the Daikin Split & Multi-Split system fault P3.
Possible Causes
- Defective connection of thermistor.
- Defective reactor thermistor.
- Defective inverter PCB.
Not sure which one it is — or if it's none of these? Try ACLogics today.
Disclaimer: This information is for general reference. Error codes can vary by model and production year. Always refer to your machine's specific manual and the information printed on the unit itself.
New to this code? Click to see why this happens
Full Diagnosis
Malfunction of thermistor in switch box
All Recorded Causes
Defective connection of thermistor Defective reactor thermistor Defective inverter PCB
Verify Before Replacing Parts
- Confirm the exact Daikin model family and split/ multi split context before acting on a generic code description.
- Confirm board LEDs, wiring polarity, and model compatibility before replacing control boards — this Daikin fault points at defective connection of thermistor.
- Check for intermittent communication faults caused by connectors, moisture, or damaged harnesses, and rule out defective reactor thermistor.
- After the correction, run the system long enough to confirm the split/ multi split fault does not return under normal load.
Still unsure about this fault?
ACLogics walks you through Daikin Split & Multi-Split diagnostics step-by-step — so you confirm the cause before swapping parts.
