Recent content by Mrspine

  1. M

    Vaillant boiler high pitch sound /whistle

    My Vaillant Main Combi 25 Eco - is making a very loud whistle sound / high pitch whine. - if I switch off the boiler while its whistling the sound still continues for a few seconds before winding down (sometimes it drops in pitch gradually) - the sound is just as loud outside at the flue vent...
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