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    Vaillant Ecotec 831 Plus problem

    Hi Guys, Ive used search but no real joy.... We have a 5 year old 831 EcoTEC boiler that has a DHW issue. on turning on tap boiler fires as should and goes to full burn..... then a few seconds later drops onto limp burn and stays. I found if you part close the direct cold in feed, back to...
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