F67 Fault — Implausible flame signal

What does F67 mean?

The boiler's electronics are receiving an unreliable or illogical signal from the flame sensor. This can indicate issues with the ignition electrode or earthing.

• Implausible flame signal
• Electronics defective
• Electrode condition
• Damaged earth lead
• Blocked condense trap

Click steps to track your progress.

1. 1

   Check the condition of the ignition electrode.

2. 2

   Verify the earth lead has no damage and good continuity (requires specialist tools).

3. 3

   Perform a strip service to check the electrode and lead condition (requires specialist tools).

4. 4

   Check that the condense trap is not blocked.