Recent content by Tri

Fantastic!!! All up and running. It's wired in and the heating is on, and switches off when I switch it off with the timer. That's more than good enough for now ~ I'll test all the programmings etc., another day. I really appreciate your help, and your very specific and helpful final reply...

Sorry, chart above didn't come out with spacings, so has become nonsense! with stars for gaps; C17 L**N**1**2**3**4 L**N,2***4******1 SM300 L (SM300) is under L (C17) N,2(SM300) is under N(C17) 4(SM300) is under 2(C17) 1(SM300) is under 4(C17) Hope that's clearer... :?

Thanks also to Taylortwocities ~ didn't see your reply until now! I'm afraid I'm a major novice, and have never even seen a wiring diagram before yesterday! Getting clearer by the hour, but unfortunately I can't decipher the comparison charts you so kindly sent a link to. I found the exact...

Thanks for your reply, I'm beginning to understand a little more of what is going on! It sounds as if I'd be able to SEE if there is a link from L - 2 in the present wiring? Am I right in thinking that? If so, nothing is present, so does that not imply that the boiler won't need it and has...

Novice user, please excuse obvious questions... I've read in detail previous threads regarding the replacement of an old Switchmaster 300 with a Horstman C17~which is exactly what I want to do. There is one (or 2, really) outstanding pieces of information I need before attempting the...