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halsted boiler problem?

i have a halsted ace he 30 combi boiler.
when i turn on the hot water,the rads warm up,although i have only select dhw,no fault codes.
ideas please.
len, August 2012
the divertor valve in the boiler is stuck in the heating position, call out an engineer, its not a diy job

Martin, August 2012
link Click here to see other fixes for Ace.