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Thx. Will take a look, then start new thread if necessary. Apols & thanks :)

Hi. Similar problem here... I have an ancient (20+yr) system with Potterton Netaheat 10-16 boiler (which I have repaired myself twice so far - ignition generator and relay). Right now, I have CH (thank goodness), but no HW. All symptoms point to a stuck motorised valve. Problem is, I can't...