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Grundfos circulator pump problem
Is there any repairing my pump. How would I check?
I have a circulating pump (UPS15-58FC, 3-Speed Circulator Pump, 1/25 HP, 115 volt - draws less than an amp that I had running for a month or so off and on a timer. I wired a temperature controller (Inkbird All-Purpose Digital Temperature Controller Fahrenheit &Centigrade Thermostat w Sensor 2 Relays ITC-1000 - relay contact capacity = 10 A) to an outlet into which I plugged the pump. I then plugged the pump in and the controller turned it on and seemed to work fine.. I left it for a day when I had more time to observe and tried it again and the breaker tripped. When I originally connected the pump I had a reverse polarity in my shed. I bypassed the polarity issue by temporarily plugging the shed power (plug end on the romex wire - this is how the shed has been for years before I bought it) into a correctly wired outlet on the outside of the house and running an extension cord to my shed. I plugged the system in and this time the controller popped and hissed. I plugged the pump into the extension cord directly and the breaker tripped. Figuring that I had caused the problem with my original polarity issue. I ordered a new pump and controller. With no polarity issue, I wired controller. Almost the exact same scenario. I installed new pump, pressurized the system bled air. Plugged the pump into an outlet and put it on a timer while waiting to have time to wire the controller. Pump turned on and off on the timer correctly. I wired the new controller to control the same outlet. The controller reached its setpoint and turned the pump on. I was about to claim success when my daughter bumped the extension cord connecting the whole system to the shed. I heard a slight pop but the breaker did not trip. I examined the extension cord it looked like it had one wire burned through. The plug end connecting all of the power to the shed looked like the ground was not connected. I re-wired the end and got a new extension cord. I plugged the pump in, and the breaker tripped.
All of this time I have had another pump grundfos 1/6 hp and a differential controller working on the same circuit. This pump was not running during any of the tests. I have checked that the outlet is supplying ~120 volts thinking there could have been a drop because of the extension cord or controller. I verified that the pump is wired correctly. I checked the (start/run?) capacitor (it has a diode in the circuit) and though I don't see a +/- on the terminals, I get the correct 10uF in one direction and 0L on my meter with the leads reversed.
As i've written this it seems that the issue, besides the wiring in my shed has been the controller. Pump works fine without it, something shorts and then pump doesn't work again. If this is the case. How do I know what went wrong? How do I prevent it from happening again even with a different controller. It seems that it is well oversized even considering a high starting amps.