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grunfos selectric ups 15-50?

sometimes when it starts up its noisy

mel
December 2011
GrundfosGrundfos UPS 15-50Heating, Home Heating SystemsPump Heating Grundfos
Shut side valves undo alen type screws clean pump or replace it with new one

ltd
December 2011
Mine is the same sometimes, probably to do with air flow, Wind comes in, against the outgoing flow of air, so you get a noise, a rumble type.

SD
December 2011

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Grundfos UPS 15-50 - Noisy Pump Issues