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Thanks for the quick reply Dave, what you say appears to make sense, what a basic system, why on earth are the wires removed from the 3 port valve in the airing cupboard though, any ideas?

Hi guys, great site, but unfortunately cannot find the solution to my probs, so hope one of you can help, we cannot have central heating only on our timer control ( Honeywell st699 ) it lights up and something in the boiler stirs but not until i move the seperate hot water switch to constant...