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radiators get warm when drawing hot water?

when drawing hot water through my combi boiler the upstairs radiators start to getb warm,is this a sign that one of the heat exchangers needs changing.
alan davenport, June 2007
no not more likely it is.

., June 2007
more likely your diverter valve is not closing the heating circuit off when it switches over to hot water mode

mark, June 2007
faulty diverter valve

hi-spec plumbing, June 2007