what is the boiler water pressure a) when cold b) when hot
cold should be 1-1.5 bar, if over that, bleed from a radiator until as it should be
hot, if its correct when cold, but exceeds 2.5/3 bar when hot, either the expansion vessel has had it, or needs charging
if both hot and cold are fine (1-1.5 cold, not exceeding 2.5 hot) then there is a problem with the safety valve, it may need cleaning or replacing
T, June 2008
