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C5

C5 - Malfunction of freezing protection (Indoor Unit)

Daikin · Simple Self Diagnosis by Malfunction Code | Daikin

What does C5 mean?

The indoor unit has detected a potential freezing issue, likely related to airflow or refrigerant levels.

Common Causes

  • Blocked air filter
  • Low refrigerant charge
  • Malfunctioning fan motor

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Turn off the unit.

  2. 2

    Clean or replace the air filter.

  3. 3

    Ensure indoor airflow is not obstructed.

  4. 4

    Turn the unit back on.

  5. 5

    If freezing protection continues, call for service.

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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