Search results

Sure, but I meant why would it do this when not firing up and when it has fired up within the last few hours. Just a bug I suspect.

Just to add belatedly, when your Vaillant boiler does something unexpected like this then press the top two buttons to display the status code whilst it's doing it. Mine also runs the fan for a few seconds now and then and the status code is S.108, which from the manual means " Purging the...