Daikin Chiller

Daikin Chiller Error Code P1

Troubleshooting guide for the Daikin Chiller system fault P1.

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What It Means

Power voltage imbalance or inverter PCB.

Possible Causes

  • Open phase.
  • Interphase voltage imbalance.
  • Defective capacitor in the main circuit.
  • Defective wiring in the main circuit.
  • 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

Power voltage imbalance or inverter PCB

All Recorded Causes

Open phase Interphase voltage imbalance Defective capacitor in the main circuit Defective wiring in the main circuit Defective inverter 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 open phase.
  3. Check for intermittent communication faults caused by connectors, moisture, or damaged harnesses, and rule out interphase voltage imbalance.
  4. After the correction, run the system long enough to confirm the chiller fault does not return under normal load.

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