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J6-00

J6-00 — OU: Malfunction of heat exchanger thermistor

Daikin · ASHP Error Codes

What does J6-00 mean?

The thermistor (temperature sensor) for the heat exchanger in the outdoor unit (OU) is malfunctioning.

Common Causes

  • Defective heat exchanger thermistor
  • Wiring problems
  • Sensor displacement

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Inspect the wiring for the outdoor unit's heat exchanger thermistor.

  2. 2

    Ensure the thermistor is properly positioned.

  3. 3

    Power cycle the unit.

  4. 4

    A qualified technician should verify the thermistor's function.

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 3)Search more codes in this manual