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I have a microbore system with a 15 to 18 year old boiler running six rads........five are scalding and one, the largest and most distant only heats partially and the return is barely warm.........I have removed and flushed rad...balanced system....flushed the pipes from the manifold...switched...

I have bought a new house with 6 rads on a gas vailliant boiler through microbore. 5 rads are fine the one in the living room cold. The feed up to it is scalding........Removed rad flushed through...no apparent residue.....checked flow both in and out and it gushed freely......replaced...