F.67 — Flame detector input signal outside limits (0 or 5 V)

What does F.67 mean?

The input signal from the flame detector is outside its normal operating limits (either 0V or 5V). This typically points to a defect within the boiler's electronic control system.

• Electronics defective.

Click steps to track your progress.

1. 1

   Reset the boiler by pressing the reset button.

2. 2

   Power off the boiler, wait a moment, then power it back on.

3. 3

   If the error persists, contact a qualified service technician as this indicates a fault with the internal electronics or flame detection circuit.