FD — Boiler coding card is missing (with additional fault B7)

What does FD mean?

The burner is in a fault state because the boiler coding card is missing from its slot. This often occurs with an additional 'B7' fault.

• Boiler coding card not properly inserted
• Boiler coding card is damaged or faulty

Click steps to track your progress.

1. 1

   Carefully check that the boiler coding card is correctly inserted into its designated slot.

2. 2

   Press the reset button 'R' on the boiler after ensuring the card is in place.

3. 3

   If the fault persists, contact a qualified heating technician; they may need to replace the control unit.