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I had a trawl around the 'Blocked Cold Feed' yes, my system displayed that fault, now sorted. Many thanks to all who posted advice on how to resolve it. Tony

Hello. Today I refitted a rad,bled it, all well,turned system back on, ran for a while rads did not get hot at all,boiler shut itself off,and it looks like I have lost all the water from the upstairs rads, tried to bleed them, just got a slight hiss, checked header tank..ok, pump also appears...