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Mend Grundfos UPS 15/50 Heating System Central Pump Repair

Grundfos Selectric UPS 15/50 Central Heating Pump started whinning?

My above pump, circa 12 years old, has started making a high pitched whinning noise from time to time. I think this happens when it has been running for a while. When the pump stops the noise stops.

Is the pump knackered or is there an adjustment I could make.

I am a good DIYer but not a plumbing engineer!

Brian
December 2010
GrundfosGrundfos UPS 15/50Heating, Home Heating SystemsHeating System Central Heating Pump Pump Repair

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Mend repair fix Grundfos UPS 15/50 home heating systems