Mailes Boss Posted March 17, 2017 Report Share Posted March 17, 2017 I have a new UP10-16 A PM BU/LC circulator that replaced an obsolete model with built in timer that lasted 8 years. It is set to run at 100% of the time. It occasionally stops pumping in the middle of the day. Not sure if it is shutting off or loses prime. It is too quiet to determine. I have not been able to use the auto or temp control features. Any ideas? Bad pump? Should I remove the the temperature sensor from the HW heater outlet? My max temp out of the heater is 150F. The pump and piping are correct, both horizontal. Thanks for any ideas. Link to comment Share on other sites More sharing options...
Jim Katen Posted March 17, 2017 Report Share Posted March 17, 2017 It sounds like you got a bum circulator. Have you tried calling Grundfos? Link to comment Share on other sites More sharing options...
Rob Amaral Posted March 17, 2017 Report Share Posted March 17, 2017 cavitation-damage?? Link to comment Share on other sites More sharing options...
Mailes Boss Posted March 17, 2017 Author Report Share Posted March 17, 2017 cavitation-damage?? Link to comment Share on other sites More sharing options...
Mailes Boss Posted March 17, 2017 Author Report Share Posted March 17, 2017 Originally posted by Mailes Boss Originally posted by Rob Amaral cavitation-damage?? Thanks for your responses. Cavitation damage is a possibility. I assume the impeller is the only part that could be damaged. Link to comment Share on other sites More sharing options...
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