What It Means
Improper combination between inverter and fan driver.
Daikin Packaged Unit
Daikin Packaged Unit Error Code PJ
Troubleshooting guide for the Daikin Packaged Unit system fault PJ.
Possible Causes
- Mis-matching of type of PCB.
- Improper (or no) field setting after replacing outdoor unit main 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
Improper combination between inverter and fan driver
All Recorded Causes
Mis-matching of type of PCB Improper (or no) field setting after replacing outdoor unit main 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 mis-matching of type of PCB.
- Check for intermittent communication faults caused by connectors, moisture, or damaged harnesses, and rule out improper (or no) field setting after replacing outdoor unit main PCB.
- 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.
