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  1. L

    grundfos ups 15-50 central heating pump.

    iv tried the mallet but it keeps bouncing off the pump so iv now got b/g homecare,il let them sort it out. thanks anyway.
  2. L

    grundfos ups 15-50 central heating pump.

    im recently experiencing a vibration on this pump when i turn on the central heating,it vibrates quite a while until it dies down.but after a while the vibration starts up again...iv possibly got air in the system so the question is.how do i stop this problem? thanks.
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