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CO-00

CO-00 — Flow sensor malfunction

Daikin · ASHP Error Codes

What does CO-00 mean?

The flow sensor responsible for monitoring water flow has malfunctioned.

Common Causes

  • Dirty or obstructed flow sensor
  • Faulty sensor electronics
  • Loose wiring connection

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Clean the flow sensor if accessible and safe to do so.

  2. 2

    Check the wiring connections to the flow sensor.

  3. 3

    Restart the unit after powering it down for 60 seconds.

  4. 4

    Contact a technician for sensor replacement.

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