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Ahh thanks. I'm an absolute noob with these systems; I'll get some photos. It's a Honeywell diverter valve - can't get in to see the model - but it must be 20yrs old. There was some resistance felt when moving to manual - with everything switched off I could hear the mechanism moving...

Hi all, Here out of desperation. Had a new bathroom fitted and the system was drained down to fit a new radiator on our ageing Potterton F60 on a conventional gravity fed system. For a week I've had no HW through the boiler (had to revert to immersion (however that's spelled)). Rads all fine...