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- 9 Oct 2016
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Hi.. I have a vaillant ecotec exclusive combi boiler which has stopped producing hot water.. the central heating side works fine and there is no error code on the display. I have reset the boiler several times. At the self test stage the display reads DHW mode DEMAND burners on but no taps are open and this then turns into DHW OVERRUN. Is this some sort of pressure switch fault in the boiler? If I open the taps at this stage I get hot water but burners are not on fully and water only gets to 39 degrees.. once the taps are off it reverts to DHW overrun again..