What does F.457 mean?

The burner is in an error state because the fan is sluggish or blocked, which can hinder proper combustion and flue gas removal. You might hear grinding noises.

• Fan sluggish or blocked
• Severe contamination of fan
• Grinding noises from fan

Click steps to track your progress.

1. 1

   Reset the appliance.

2. 2

   Listen for grinding noises from the fan.

3. 3

   If the fault recurs or you hear grinding noises, contact a qualified technician to check the fan for sluggishness or contamination.