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UA

UA - Improper combination of indoor and outdoor units (System)

Daikin · Simple Self Diagnosis by Malfunction Code | Daikin

What does UA mean?

The indoor and outdoor units are not compatible with each other, indicating a potential installation or configuration error.

Common Causes

  • Incorrect unit pairing
  • System configuration error
  • Incompatible models

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Turn off power to all units.

  2. 2

    Verify that the indoor and outdoor units are listed as compatible models.

  3. 3

    Ensure the system is configured correctly according to the installation manual.

  4. 4

    Restore power and check if the error is resolved.

  5. 5

    If the problem continues, contact your installer.

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

Related Faults

6-06-0 - External protection device activated (Heat reclaim ventilator)6-16-1 - Malfunction of PCB (Heat reclaim ventilator)6-26-2 - Ozone density abnormal (Heat reclaim ventilator)
Source: Simple Self Diagnosis by Malfunction Code | Daikin
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