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Searched wiki etc.but couldn't find any related info. When hot water only is on, one of the upstairs radiator heats up. All other radiators remain cold. Three seperate control valves on heating system, 1 for hot water, 1 for upstairs and 1 for down stairs heating. Radiator heats up from...

Replaced powerhead today as suggested and all is now working fine - Yippie :P I'm so pleased that DIYNOT forumies take trouble in helping us all to resolve all kinds of problems and DIY troubles. Many thanks to Dave and Tony, without your help I would not be soaking away tonight in a...

Dave When HW is selected the manual lever on the valve is not loose. I will therefore check for 240VAC on the brown wire to the valve head. If this is live, then I would rather replace the complete valve as suggested. Many thanks for your help.

Dave - thanks for your reply. I'm not sure the zone valve is working for the HW. The other 2 zone valves are working for the CH though. If the HW valve is working then I will test the cyl stat & programmer

glow.worm 30sxi high efficency condensing boiler does not fire up when the hot water control is switched on (either on auto or manual) Boiler fires up ok when central heating is switched on. 3 honeywell motorised valves control upstairs and downstairs heating plus the hot water system. Could the...