C6 215 — Fan running too fast

What does C6 215 mean?

The boiler's fan is operating at an excessively high speed. This indicates a problem with the fan or its control system.

• Faulty fan motor or speed sensor.
• Problem with the fan harness or connector.
• Control board malfunction.

Click steps to track your progress.

1. 1

   Reset the boiler by turning it off at the mains for 30 seconds and then back on.

2. 2

   Check for any visible damage or loose connections on the fan harness.

3. 3

   Contact a Gas Safe registered engineer, as the fan or control unit may need to be checked or replaced.