system pushing water up relief line not round radiators , increase hieght of relief line
jim
November 2009
check none of the ads have air in them, after that could be the coil in the cylinder, very rear but anything is possable, if the expanshion tank and cold water cistern are at the same level could feed from one to other water finds its own level. Might be worth lifting the small tank so both water levels are the same.
erj
November 2009
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