Daikin Chiller

Daikin Chiller Error Code PJ

Troubleshooting guide for the Daikin Chiller system fault PJ.

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What It Means

Improper combination between inverter and fan driver.

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

  1. Confirm the exact Daikin model family and chiller context before acting on a generic code description.
  2. Confirm board LEDs, wiring polarity, and model compatibility before replacing control boards — this Daikin fault points at mis-matching of type of PCB.
  3. 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.
  4. After the correction, run the system long enough to confirm the chiller fault does not return under normal load.

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