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Thanks Tom1981 and OwainDIYer for your quick replies. Really useful to me as I have just started doing DIY first time in our new home. If I buy Channelplus H21XL and replace it with alteration of wire, I think that will fix my issue? Thanks

Hi all, I am totally new to this forum. But I am hoping that I will surely get an answer to my questions. I just bought the house and it has Potterton Boiler system Switchmaster 805 control Teddington thermostate Boiler system works manually and via thermostat but dialer on the 805...