Vaillant · Turbomax Plus Boilers
This indicates that the burner flame, or pilot light, has gone out while the boiler was operating. This can be caused by problems with the gas supply, the flue system, or a frozen condensate pipe.
Click steps to track your progress.
Check if other gas appliances in your home are working to confirm gas supply.
Ensure the condensate pipe, often a plastic pipe on an external wall, is not frozen. Thaw gently with warm water if needed.
Restart the boiler by switching it off and then on again at the main power supply.
If the flame still fails to stay lit, contact a qualified heating engineer to inspect the gas valve, flue, or fan.