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C5-00

C5-00 — Heat exchanger thermistor abnormality

Daikin · ASHP Error Codes

What does C5-00 mean?

The thermistor (temperature sensor) for the heat exchanger is showing an abnormal reading.

Common Causes

  • Defective thermistor
  • Wiring issues
  • Environmental factors affecting reading

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Inspect the wiring connected to the heat exchanger thermistor.

  2. 2

    Ensure the thermistor is not exposed to extreme temperatures.

  3. 3

    Try restarting the unit.

  4. 4

    Professional diagnosis is required if the abnormality continues.

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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