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Either something blocking the impeller / shaft, from turning or the motor failed.
You can try to manually assist the motor, by removing the small cap at the back of the motor, getting a flat blade screwdriver, and right when you flip the switch (get a helper) turn the shaft clockwise while it buzzes. If it takes off - possible Bad Capacitor? Try a couple times if it doesn't take.
if bad capacitor, make sure you get the exact replacement, or 'Slightly Greater' will work - and I refer to the MFD number. Don't go smaller!
3 THINGS QUICK.. RUN CAPACITOR THIS IS LOCATED ON TOP OF MOTOR HAVE IT CHECKED. OR START SWITCH DIRTY OR STAR CAPACITOR BAD.. SEARCH YOUR AREA FOR YOUR LOCAL POOL PUMP MOTOR REPAIR GUY WITH FREE TESTING.. WARNING THESE CAPACITORS HOLD HIGH VOLTAGE AND WILL NEED TO BE SHORTED ! USE A DRY RAG AND COVER CAPACITOR THEN SHORT WITH SCREWDRIVER
The pump needs to be disassembled to inspect for an obstruction in the impeller area or possible bad bearing in the motor, often caused by a leaking shaft seal
hi i had the same problem with my booster pump motor it hum but did not turn. to make a long story short see if there is a metal cap on the back of your motor if there is pry it off and you should get to see the shaft turn the shaft with a screwdriver if it has a notch in it or if it don't turn the shaft anyway you can and make sure it turns easy. my shaft was tight as hell but i got it to turn and it started right up again and i had no problem. the hum means it is stuck and it shuts off because the breaker is tripping and after a few seconds it will click back on again, hope this helps
Has the motor seemed a little slower in starting than usual? If so then you probably have a weak or defective motor capacitor. Try switching out with a new one.They are inexpensive.Try to turn the motor shaft at rear (under end cap) while it attempts to start. If the motor kicks on then replace capacitor.
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