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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
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