Response to Hi J, you can start your diagnosis by checking to be sure the impeller turns freely - a stuck impeller, frozen bearings or frozen shaft seal will make hand-turning the impeller difficult and may cause it to not start.  If that is okay, then you might try testing the capacitor using the instructions in the How to Test a Pool Pump Capacitor guide to confirm if it's the culprit. If the capacitor is okay, you will have to replace the motor.  The capacitor is a small part that looks similar to a battery. They are typically only good for around 5000 starts before they go bad. So, if you’ve had your motor for a long time and now it won’t reliably start or hums, the capacitor may be the issue.

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