F.457 — Burner in fault state: Fan sluggish or blocked

What does F.457 mean?

The burner is in a fault state because the fan is sluggish or blocked. This issue can prevent proper airflow for combustion, leading to boiler shutdown.

• Fan sluggish or blocked
• Contamination of the fan unit

Click steps to track your progress.

1. 1

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

2. 2

   Listen for any unusual noises or reduced airflow from the fan unit.

3. 3

   If the fan continues to be sluggish or appears blocked, contact a qualified heating engineer to inspect and potentially clean or replace the fan.