i have a vaillant turbomax 242e changed diverter valve but still not getting hot water .gasman told me dhw heat exchanger probably blocked problem i have is i dont seem to be able to isolate boiler .I have stoptap on cold feed in to boiler but when i turn it off i still get water out of the hot tap

doug, February 2013

just turn of the main stop tap in the house this will turn of the water to the boiler. u will also need to drain the heating water out the boiler to. and also there is water in the pipes to so when u turn of the water expect water to drain out the taps for a minute or so.

kash, February 2013