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excellent cheers. have always done heating installs, finding this breakdown lark whole new ball game. thanks for your help

thanks mate. also had another problem with a baxi 105e. when hot water tap is turned on boiler sounds like a fog horn, have spoke to baxi and done what they've told me, checked for blockages in filters, plate to plate e.tc but all clear. burner pressure is fine so not over gassing.

yes. demand light comes on and boiler fires but heat goes down the flow

having problem with worcester 240 boiler. no hot water unless heating is on, have changed diaphragm but still the same. could someone please tell me if more likely to be diverter valve assembly or calorifyer