What It Means
Malfunction of thermistor in switch box.
Daikin Packaged Unit
Daikin Packaged Unit Error Code P3
Troubleshooting guide for the Daikin Packaged Unit 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.
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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 packaged 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 packaged fault does not return under normal load.
Still unsure about this fault?
ACLogics walks you through Daikin Packaged Unit diagnostics step-by-step — so you confirm the cause before swapping parts.
