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Just forgot to include some more info. from reading about typical 'Y' setups it seems like ours is pretty non standard in that only the bedroom rads are fed by the valve (A) which also flows (B) to the HW cyl. Also I have no programmer to control the HW on its' own. I guess just the boiler stat...

Thanks for the replies - Yep I didnt realize there were so many parts to a heating system. :shock: I managed to identify the valve in question is a honeywell v4073a. I found a coloured drawing presumably by the installer with what teminals to test when the heating / HW is calling etc. Ive...

Hello all - 1st post for me here goes :? We have a Rayburn oven driven open CH system over 3 storeys. For a couple of years the top 4 rads have been stone cold for ages then all of a sudden hot. Once the bottom 2 storeys rads had been on for say 1 hr, they suddenly went hot. All this week...