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droning

  1. R

    Loud droning from new Vaillant system boiler

    We had a new Vaillant EcoTec Plus 612 system boiler installed in February. Occasionally, about once per week, we have experienced a very loud droning resonance in the pipework. This is savage enough to be heard through the house and felt on the pipes and boiler casing. It appears to be caused...
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