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  1. K

    Ignition light on & off while cold and hot water are mix

    :cry: I am trying to plumb everything myself and nothing goes as easy as planned. I have just fixed a mixer tap (not thermostatic) for the use of bath and shower. I have now noticed that when I mix the cold and hot water, the ignition light on the combi boiler (Vaillant) goes on and off and when...
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