F02 Fault — DHW outlet sensor interruption

What does F02 mean?

There's an interruption with the Domestic Hot Water (DHW) outlet sensor, often in conjunction with F.91 faults. This could be due to a defective sensor, cable, or plug connection.

• NTC defective
• NTC cable defective
• Defective plug connection on NTC
• Defective plug connection on the actoSTOR electronics

Click steps to track your progress.

1. 1

   Check that the NTC sensor is connected properly and securely.

2. 2

   Check the resistance of the NTC sensor (requires specialist tools).

3. 3

   Check the continuity of the wiring harness connected to the NTC sensor (requires specialist tools).