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A3

A3 - High water level

Daikin · Air Conditioning

What does A3 mean?

The unit has detected a high water level, likely in the condensate drain system.

Common Causes

  • Float switch is open circuit.
  • Drainage blockage.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Ensure the air conditioner's drain pan and outlet are not blocked.

  2. 2

    Check that the float switch is properly positioned and not obstructed.

  3. 3

    Inspect the condensate drain line for clogs or kinks.

  4. 4

    If the problem continues, contact a service technician.

Browse all codes in this manual (79)
Verified technical data. Last updated: April 2026

Related Faults

A0A0 - External protection activeA1A1 - Indoor PCB failureA2A2 - Malfunction of freezing protection
Source: Daikin Air Conditioning
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