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89-03

89-03 — Heat exchanger freeze-up protection activated during defrost (warning)

Daikin · ASHP Error Codes

What does 89-03 mean?

This is a warning indicating a potential freeze-up in the heat exchanger during the defrost cycle.

Common Causes

  • Incomplete defrost cycle
  • High humidity levels
  • Possible blockage in the defrost drain

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Observe the defrost cycle's effectiveness.

  2. 2

    Check the defrost drain for any blockages.

  3. 3

    Ensure proper ventilation around the outdoor unit.

  4. 4

    If the warning reappears frequently, seek professional advice.

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

Related Faults

7H-017H-01 — Water flow problem7H-047H-04 — Water flow problem during domestic hot water production7H-057H-05 — Water flow problem during heating/sampling
Source: Daikin ASHP Error Codes
Open Manual (Page 2)Search more codes in this manual