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thanks guys - that a great help. will let you know how it goes. thanks again.

thanks very much for the reply - its hard to say whether its always been the way it is now, i've inherited the problem, but it has certainly been like that for over 12 months. there is a 3 port mid-way valve, and 1 pump. there is a room stats and cylinder stat. So to clarify, the boiler does...

I have a rayburn gd80 that heats the hot water and cnetral heating. even if the controls are demanding central heating the boiler will not run unless the boiler (water) stat on the side of the range is set to 80 degrees. any ideas anyone?