Daikin Air Conditioner Error Code UA

UADaikin Air Conditioner

What this code means

Excessive number of indoor units or mismatching refrigerant type between indoor and outdoor units.

First step from the service manual

Check if outdoor unit PCB was replaced; verify total indoor unit count is within connectable range.

Next steps: diagnose the root cause

1
Verify the error code is active

Power cycle the unit and see if the code returns. If it does, the fault is persistent and requires diagnosis.

2
Get the full diagnostic procedure

Get step-by-step guidance, test values, and wiring diagrams from the OEM service manual.

Start diagnosing UA on your Daikin air conditioner

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What’s available for Daikin air conditioner models

Access Daikin air conditioner service manuals, wiring schematics, exploded parts views, and error code references on MyPros+.

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