F8 — Gas valve closes too late

What does F8 mean?

The burner is in a fault mode because the gas valve did not close in time after a shutdown command, posing a safety risk.

• Malfunctioning gas valve
• Faulty control wiring or connections to the gas valve

Click steps to track your progress.

1. 1

   Press the reset button 'R' on the boiler.

2. 2

   Ensure the gas supply valve to the boiler is easily accessible in case of emergency.

3. 3

   Contact a qualified heating technician to check the gas valve and its control wiring/connections.