F.377 — Burner in fault state: Ionization adjustment stabilization not met

What does F.377 mean?

The burner is in a fault state because the stabilization conditions for post-calibration of the ionization adjustment were not met. This can be due to incorrect gas type settings.

• Incorrect gas type setting
• Faulty BCU burner control unit

Click steps to track your progress.

1. 1

   Check that the gas type setting configured in the boiler matches your gas supply.

2. 2

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

3. 3

   If the fault recurs, contact a qualified heating engineer, as the BCU burner control unit may need to be replaced.