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  1. cycletech

    Central Heating 3 Way Honeywell Valve Head getting hot

    Hi All, I replaced a 3 way valve (V4073) as rads where getting hot when just HW on, that part is now fine. But after CH switches off, from room stat or from programmer/timer, there is a faint buzz coming from the valve head and after a short time the head becomes very HOT! (If HW is still...