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CO-01

CO-01 — Flow sensor malfunction

Daikin · ASHP Error Codes

What does CO-01 mean?

Indicates a malfunction with the flow sensor that measures water movement.

Common Causes

  • Sensor failure
  • Interference with the sensor
  • Control unit communication error

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Ensure the area around the flow sensor is clear.

  2. 2

    Check for any error messages in the app related to communication.

  3. 3

    Power cycle the unit.

  4. 4

    A professional installer should be consulted.

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
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