C6 216 — Fan speed too low

What does C6 216 mean?

The boiler's fan speed is too low. This can prevent proper combustion and flue gas expulsion.

• 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 off the main power for 30 seconds, then restarting it.

2. 2

   Visually inspect the fan and surrounding areas for any obstructions.

3. 3

   Contact a Gas Safe registered engineer to inspect the fan, its wiring, and associated controls.