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:oops: Sorry, I haven't got a clue what I'm talking about to be honest, I'm doing this for my step-dad, he's technophobic. He has told me that the valve seems to be jammed open so now we can have heating but we can't control it, it's all or nothing basically. I have sourced a replacement...

Nope, it isn't pumping the water at all, it's just making this grinding buzzing noise like it's trying but failing.

Bump :D I'm cold.

Hi, my central heating has decided to stop working as it seems to do every winter. As far as I can tell the zone valve is gone, it's a Honeywell V4043H 28mm and it's making a weird constant grinding/buzzing noise. Is it fixable or will I need to replace the whole valve? Will I need to replace...