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Checked room stat and all ok, Just found the mid position valve (assume thats what you mean by a 1 x 3 port valve) in the airing cupboard and it seems to be stuck on the W, there is a plstic type switch but it won't seem to budge.

All of a sudden my heating does not work. HW is fine boiler fires no problem, but CH does not fire. Any ideas? Cheers