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    Low System Water Preasure - Valliant ecoTEC Fault F.22

    Hello, I had the same problem, looked for help here and other places, didn't find anything that looked as though i could do it myself. Got someone to come look at it. Turns out, there are 2 white knobs on the underside of the boiler. turn them both 90 degrees, watch the pressure gage, should...
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