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Sorry yes my post is probably confusing, the pic is not of full wiring centre, just a close up of the white wire that comes from the valve near the boiler that is faulty. I've attached some more pics. I'd not realised there is a 2nd valve upstairs by the hot water cylinder, as I've not had to...

just to add - also a valve up next to the hot water tank (different part code) and a thermostat on the hot water tank.

thank you for answering and yes i have bought the valve head, the guy who sold it to me said it was cheaper to buy the whole thing. I have already taken the pipe work off the so it can just be replaced easily. I just want to know if i can use this valve head on my system, which I think i've...

thank you for everyones help .. the white wire is connected to the wiring centre but no other wires with it. The problem is I don't know what type of system it is - boiler, hot water cylinder in airing cupboard, water tank in the loft, one zone valve, honeywell controller thats used just for...

I've got a gravity fed central heating system with a honeywell mortorised zone valve V4043H1106 which needs replacing. (I also have a Netamo smart thermostat, just in case that makes a difference) I've bought a replacement head the code is 272848 but this is missing the white wire. can this be...