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Thanks again DP but if you could bear with me. I'm still puzzled (and sorry if missing something obvious) about your last post. Yes, I agree that the pump has a direct feed from position 2 via 79 (the relay) but isn't that only true whilst the solenoid microswitch is in it's unmade state...

Thanks for your reply DP, much appreciated. I only have TRVs and a time clock at the moment which is why I wanted to wire the pump to terminal II as per the instructions in the manual. I agree your suggestion re the roomstat is a more efficient option and is probably the way I'll go. However...

Thanks cross thread, I think that's about right. The service leaflet states "Setting II; For use with thermostatic radiator valve systems. Pump is switched off by clock or gas valve switch when gas valve closes". My problem is that it appears to me that when I press the heating switch the pump...

To anybody out there with experience on these old wonders (installed 1982!). The boiler has 3 options for wiring (not speed settings) and works fine with the pump wired to connection I ( appropriate, according to manual when clock and roomstat fitted) or connection III ( pump running...

Happy new year all. Ok, so I'm trying to fix my mums 40 year vcw sine 18 boiler which has given stirling service (20 years whilst residence was a guest house) and which I feel still has some years life left in it. Having read several previous posts/answers from very experienced vcw heating...