Vaillant · ecoTEC plus Boilers
The gas valve is not shutting off properly or with a delay. This can indicate a leak in the gas valve or a defect in the boiler's electronics, which is a critical safety concern.
Click steps to track your progress.
Immediately turn off the gas supply to the boiler if you suspect a gas leak or smell gas.
Reset the boiler by pressing the reset button. Do not attempt to reset multiple times if the issue recurs.
Contact a qualified service technician immediately to inspect the gas valve and electronics.