So, that's the usual 3 in(to the timer) then same 3 back out to the boiler?
Like I say I don't want to take the CH out of commision for as long as i can afford to.
I had the boiler replaced 2 years ago but not the clock. This is a real newbie question so be easy on me..
I want to replace the clock and I have a fair confidence in electrics but I' ve heard horror stories about the importance of matching up the wires. I haven't taken apart the ancient...