Vaillant · ecoTEC plus Boilers
The gas valve is not functioning, meaning it cannot open or close correctly. This can be due to electrical connection issues or a defective component.
Click steps to track your progress.
Press the reset button on the boiler display up to three times to try and clear the fault.
Contact customer service. This indicates a problem with the gas valve's ability to function, possibly due to electrical connections or a defective motor.
A qualified technician will need to check the gas valve's connections, cable harness, and internal components.