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C0

C0 - Malfunction of sensor system (unified)

Daikin · Air Conditioning

What does C0 mean?

A general sensor malfunction has been detected within the indoor unit.

Common Causes

  • Faulty temperature or humidity sensor
  • Loose sensor wiring
  • Control board issue

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Power cycle the unit by turning off the breaker for 60 seconds.

  2. 2

    Ensure sensors are not physically blocked or dirty.

  3. 3

    A technician will need to identify and replace the faulty sensor.

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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