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new divertor & pcb?

how do i get the water to go hotter on my vaillant turbomax,just had new pcb and divertor fitted rads ok ,water very warm,guys ok who fitted it (only mim fitting price=£20) think hot water might go off when boiler not on ?
barry haney, November 2008
Check plate domestic heat exchanger if one half is hot the other half cool then there is no heat transfer, it has a sediment lining in it stopping heat transfer

a, November 2008
link Click here to see other fixes for Vaillant Turbomax.