3C (217) - Fan not running

What does 3C mean?

This error indicates that the boiler's fan is not operating, which is crucial for safe combustion and exhausting flue gases. Without the fan, the burner will not ignite.

• Fan motor malfunction or blockage
• Power supply issue to the fan
• Faulty fan control wiring
• Defective electronic board (PCB)

Click steps to track your progress.

1. 1

   Turn off the boiler, wait a few minutes, then turn it back on. This may clear temporary electrical glitches.

2. 2

   Check for any audible or visible signs of the fan attempting to start. Listen for buzzing or whirring. Carefully check for any physical obstructions near the fan if it is accessible.

3. 3

   Verify that the electrical connections to the fan are secure and undamaged. Loose connections can prevent the fan from receiving power.

4. 4

   If the fan still does not run, it likely requires professional inspection to diagnose a faulty motor, control board, or wiring issue.