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Hi chrishildreth, as you can see from my earlier mail, I had a very similar problem as you are describing. Replacing the hydraulic valve in my boiler (Done by a pro) seems to have solved the problem. Not sure if this will help you, but thought I'd let you know anyway. Sean.

Hi Oilman, I have exactly the same problem, upstairs rads hot, downstairs cold. - I have a Gas fired heating system(Mains) - Potterton Boiler - yes, I have a hot water tank in the loft - 20 Gallon - Cold water tank is also 20 gallon -- the water pressure is at 1.75bar, I have hot...