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Ok folks, will check this out. Many thanks for your suggestions. Well, cold feed wasnt blocked, BUT when I removed the cover to the MV it was pretty damp with condensation. It looks like water has got into it and was shorting things out so not switching properly. I've isolated everything...

Ahhh. Makes sense. Please excuse my ignorance, but what is the sequence to bleed the air/refill the pump? Once it ran (two days ago) I did run the central heating up to check all the rads got hot, they did.

Thanks folks, yes it is an old blue switchmaster. Further this, with the valve at HW, I removed the pump centre disc to check it was running. The spindle was rotating, but relatively little water came out. I assume this again points to lack of water in the system.

OK, has anyone had this problem? I went on holiday for a week and turned my hot water system off. I have a gas boiler with a tank, a controller, a motorised valve and a Grunfos pump. When I came home the hot water would only heat up by bleeding the pump. Before this the motorised valve just...