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Baxi Boiler/heating comes on when in off mode?

i have a baxi boiler.The heating is in the off setting for summer, yet whenever I use the hot water for the shower hot water is being pumped through the radiators and they come on.
There is also a DH message that appears when this happens? Any ideas?
egibbs, May 2009
your d/valve is letting-bye needs to be replaced
capitalboilers.co.uk

capitalboilers.co.uk, May 2009
link Click here to see other fixes for Baxi.