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Grundfoss PM Auto UP10-16 Circulator


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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.

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