As soon as you put the power on ie from isolator switch hot water is always on and no heating no matter what the settings
if it old may time to replace it then
So what fits I'm fairly competent but plug and play is nicer lol
Hi
just moved into a house and have a British gas emp 2 programmer
as soon as you turn it on the hot water comes on even when set to off , and the hot water doesnt work no light nothing any help ??