What It Means
Defect of indoor/outdoor power supply.
Daikin Split & Multi-Split
Daikin Split & Multi-Split Error Code UA
Troubleshooting guide for the Daikin Split & Multi-Split system fault UA.
Possible Causes
- Wrong model connections.
- Improper power supply.
- Wrong PCB connected.
- Defective 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.
New to this code? Click to see why this happens
Full Diagnosis
Defect of indoor/outdoor power supply
All Recorded Causes
Wrong model connections Improper power supply Wrong PCB connected Defective PCB
Verify Before Replacing Parts
- Confirm the exact Daikin model family and split/ multi split context before acting on a generic code description.
- Start with the exact model documentation and verify the full operating sequence before replacing parts, particularly around wrong model connections.
- Use the listed causes as branches to confirm or eliminate with measurements, not assumptions — improper power supply is a reasonable second branch.
- 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.
