Daikin VRV

Daikin VRV Error Code U2

Troubleshooting guide for the Daikin VRV system fault U2.

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What It Means

Malfunction of power supply or instantaneous power failure.

Possible Causes

  • Abnormal power supply voltage.
  • Instantaneous power failure.
  • Defective main circuit wiring.

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 power supply or instantaneous power failure

All Recorded Causes

Abnormal power supply voltage Instantaneous power failure Defective main circuit wiring

Verify Before Replacing Parts

  1. Confirm the exact Daikin model family and vrv context before acting on a generic code description.
  2. Start with line voltage, low voltage, and board output checks in sequence so the fault is isolated cleanly — the data plate flags abnormal power supply voltage.
  3. Inspect connectors, relay outputs, and any recently replaced electrical parts for mismatch or loose fit, and verify instantaneous power failure.
  4. After the correction, run the system long enough to confirm the vrv fault does not return under normal load.

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