Hi, I have just purchased a Vaillant time switch 140 programmer, which plugs directly into the boiler. Does anybody know if this will override the exsisting thermostatic clock or will the old one have to be removed.
Don't forget you are talking to someone who knows zilch about boilers or heating. Any advise would be much appreciated.
Cheers Pommyjohn
Don't forget you are talking to someone who knows zilch about boilers or heating. Any advise would be much appreciated.
Cheers Pommyjohn