Fault A1 - Boiler communication issue

What does A1 mean?

This fault indicates a general communication problem within the boiler system. It requires resetting the boiler and potentially checking internal circuit boards.

• Internal communication error
• Issue with the LGM (burner control unit) or VR20 circuit board

Click steps to track your progress.

1. 1

   Acknowledge the fault and reset the boiler.

2. 2

   Power the boiler off and on.

3. 3

   Remove the VR20 circuit board and reinstall it, ensuring good contact.

4. 4

   Power the boiler off and on again.

5. 5

   If the fault reappears, the LGM may need replacement.