F.456 — Burner in fault state: Error in program run monitoring with fan issue

What does F.456 mean?

The burner is in a fault state due to an error in program run monitoring, potentially linked to a sluggish or blocked fan. This affects combustion and safe operation.

• Error in program run monitoring
• Fan sluggish or blocked
• Severe contamination or grinding noises from fan unit

Click steps to track your progress.

1. 1

   Reset the boiler by briefly turning off and on its power supply.

2. 2

   Check the fan for any sluggishness or signs of blockage.

3. 3

   If you notice severe contamination or grinding noises from the fan, contact a qualified heating engineer for inspection or replacement of the fan unit.