F.67 — Electronics/flame fault

What does F.67 mean?

The boiler's electronics have detected an implausible flame signal, meaning the flame sensing is incorrect or inconsistent. This is a safety measure to prevent unsafe operation.

• Implausible flame signal detected by the control electronics.
• Main electronics board of the boiler is defective.

Click steps to track your progress.

1. 1

   Press the fault clearance key on the boiler to reset it.

2. 2

   Note the fault code and any symptoms before the fault appeared.

3. 3

   If the fault persists, contact Vaillant Service Solutions, as this is a critical internal electronic and flame sensing fault.