What It Means
Malfunction of power supply or instantaneous power failure.
Daikin Split & Multi-Split
Daikin Split & Multi-Split Error Code U2
Troubleshooting guide for the Daikin Split & Multi-Split system fault U2.
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
- Confirm the exact Daikin model family and split/ multi split context before acting on a generic code description.
- 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.
- Inspect connectors, relay outputs, and any recently replaced electrical parts for mismatch or loose fit, and verify instantaneous power failure.
- After the correction, run the system long enough to confirm the split/ multi split fault does not return under normal load.
Still unsure about this fault?
ACLogics walks you through Daikin Split & Multi-Split diagnostics step-by-step — so you confirm the cause before swapping parts.
