Recent content by KaraV

  1. K

    Vaillant ecoTEC Plus 637 with ST9400C programmer

    :? Hi, I have this boiler for 3 years and is working great since 2 weeks ago when we had a power outage and I noticed that I was not getting hot water, so I switched it off and tuned on, all was ok but when I turn the heating on nothing happens; So I did my own investigation and found that I...
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