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UA

UA — Indoor-outdoor unit combination fault

Daikin · Air Conditioner

What does UA mean?

This code indicates a fault related to how the indoor and outdoor units are communicating or operating together. It's a general combination error.

Common Causes

  • Communication error between units
  • Mismatched indoor/outdoor units
  • System configuration issue

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Ensure the indoor and outdoor units are compatible and correctly configured.

  2. 2

    Check wiring connections between the units.

  3. 3

    Consult the installation manual or a technician to verify system setup.

Browse all codes in this manual (40)
Verified technical data. Last updated: April 2026

Related Faults

0000 — Normal operationA1A1 — Indoor unit PCB defect detectedA5A5 — High pressure or freeze-up protector activated
Source: Daikin Air Conditioner
Open Manual (Page 31)Search more codes in this manual