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  1. D

    Grundfos pump humming

    Thanks to everyone for your help and advice.
  2. D

    Grundfos pump humming

    The nearest solid wall is a foot away from the pump. I'm wondering if I can put a wire stay in and effectively suspend the whole arrangement.
  3. D

    Grundfos pump humming

    Trouble is the pump is a long way from any surface, with about half a metre of pipe either side of it. Perfect conditions to vibrate a little.
  4. D

    Grundfos pump humming

    Hi, my central heating uses a Grundfos UPS 15-50 which is about 15 years old. Over the last few months it has started humming, it's not very loud but in the wee small hours of the morning it resonates through the pipework and wakes me up. The pump is mounted in the middle of a horizontal L...
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