F.77 — Burner in fault state due to data memory error

What does F.77 mean?

The burner is in a fault state due to an error in the data memory of the burner control unit. This can prevent the boiler from operating correctly.

• Data memory error in burner control unit
• Faulty BCU burner control unit

Click steps to track your progress.

1. 1

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

2. 2

   If the fault recurs, contact a qualified heating engineer for further diagnosis.

3. 3

   An engineer may need to replace the BCU burner control unit if the issue persists.