What It Means
Malfunction of radiation fin temperature sensor.
Daikin Split & Multi-Split
Daikin Split & Multi-Split Error Code P4
Troubleshooting guide for the Daikin Split & Multi-Split system fault P4.
Possible Causes
- Defective radiation fin temperature thermistor.
- Defective inverter PCB.
- Defective INV.
- compressor.
- Defective fan motor.
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.
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Full Diagnosis
Malfunction of radiation fin temperature sensor
All Recorded Causes
Defective radiation fin temperature thermistor Defective inverter PCB Defective INV. compressor Defective fan motor
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 radiation fin temperature thermistor.
- Check for intermittent communication faults caused by connectors, moisture, or damaged harnesses, and rule out defective inverter PCB.
- 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.
