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Indeed, many lessons learned. The trouble was, when I set out to do this, I had only a basic idea of how the system worked in terms of the wiring and the only way I could operate really was by trial and error and by taking the advice from each of you on this forum. I love a bit of DIY and I'm...

Sorry not to have replied to all your posts sooner - I've had a mental couple of days in work and haven't even been near a laptop. Anyway, thank you all again for your time and efforts. It is very difficult at times, as I'm sure you'll appreciate, to communicate quite what I'm...

Thank you Doc and Steptoe. I know what you mean about the wire colourings. Also, I take the point about the possibility of there being old/different programmers / stats on the system, but I do know that these are the original and only programmer, stats, boiler and system set up. I think my...

Ha, ha - I did break out the colours to draw myself a little diagram just to try and saturate a few things. Yes, 99.99% sure it's Y-plan - Have looked at lots of bumf and info. Looked at fully pumped systems with and without pump overrun - this appears to be the latter. What I really don't get...

Programmer is a Honeywell ST699B. Wiring is as follows, as per Honeywell's own wiring guide:  (Link L-5-8) 7 = H/W off, 6 = H/W on, 3 = C/H on, 2 = N and 1= L. I have checked this at the house and all is as it should be. Have not yet had opportunity to check if all go to correct terminals at...

Thanks special location. Very detailed and useful (once I get my head around all that) . I have uploaded a photo and labelled to show what I think is going on. I know I am making a lot of guesses (some educated, most not!) as to what is what here. But there are few things that just don't look...

Just been to the house quickly on my way to work. Wired direct to 'call for heat' from programmer - same repeated clicking noise coming from actuator. Opened the housing and could see the spring /arm just twitching back and fore. Clicking seemed to be comming from microswitches, so just touched...

Thanks Onoff. That'll defo come in handy. Yes, the frost is a worry, though I have found that I can get the heating on as long as water is on. Didn't think to mention that before. Does that spark any ideas as to the problem??

Thanks. That's all really good advice and I'll give it a try. I am quite competent with these things, once directed by kind folk such as yourself. It's in my nature, if you know what I mean. Not a silly question at all and the answer is I don't know. All I know is that when I came to give the...

Onoff - I can take photos and post, but won't get back to the house for a few days because of work commitments. Hi, Steve - all wiring seems to be in place, but don't know how to check how most of it in the back of programmer is connected at the other end. I am learning as I go, I'm afraid. I...

Hi, Yes - 1 programmer, 1 room stat, 1 cylinder stat, 1 3 port valve and 1 BIG headache... Lever is on auto. Room stat is old (not digital), but can hear the click to indicate call - have check common and switch lives at both the junction box and room stat terminals. Yes the white wire from...

Thanks, I'll give it a go. Cheers for the link.

Hi, A bit of a long story, but I'll try to be brief. My father passed away earlier this year and I have been dealing with his estate/house etc. acting as executor. Recently discovered that boiler won't fire up / come on with call for heat, but will with call for H/W. Immediately thought that...