Question about Grundfos Pumps UPS15-58FC

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One of my 3 Grundfos UPS 15-58 FC pumps on my heating system has a slight rattle and is running very hot. The temperature drop across the pump is also much greater than that of the other supply side Grundfos. Is the rattle a bad bearing and is the impeller toasted. It may have run dry earlier this summer when one of the kids turned on a thermostat, while the electric heating tanks were shut off.

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  • 216 Answers

In most cases the impellers are what fail in these pumps. Generally speaking if a bearing is going out you won't have a heat difference you would have a pump that fails to run due to overheating of the thermal overload or the circuit breaker tripping. You can test the pressure to see if it's the same or close to the others 15% or more requires a replacement of the impeller.
Running these pumps without fluid will also quickly destroy impellers within 10 minutes. They require that fluid to stay cool.

Posted on Oct 20, 2013

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Posted on Jan 02, 2017

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SOURCE: Grundfos MQ pump starts every 15 seconds

Pressure is bleeding back through the pump or system to the tank or well or where ever the water is coming from. Should be some sort of one way valve to keep water from going back to the source, mounted somewhere so that once pressure is pumped up, it will hold that pressure in the part of the system that has the pressure switch that controls the pump.

That or you have a leak where you can't see it. (Actually you do, it is just internal and not leaking outside the pipes!)

Posted on Nov 05, 2012

boysor2933
  • 293 Answers

SOURCE: Low pressure from grundfos pump to house

Does your system equipped with pressure tank (pneumatic tank)? If it has, maybe it's already filled with water due to some pinhole leaks. Drain the tank and see what will happen.

Posted on Nov 06, 2012

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Does the receptacle have power?
If receptacle has power, and Grundfos is not working, then it is broken.
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http://www.us.grundfos.com/web/download.nsf/Pages

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Add a comment about water heater if that is also a problem.
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For do-it-yourself electric water heater repairs:
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