You can check the windings by going lead to lead. You should have continuity.
Then go lead to ground, you should not have continuity.
If either if these tests fail you need a new motor.

You need a special tester to test capacitors but if it actually starts that's highly unlikely to be your problem.

Probably unlikely also but is there a screen inline? Probably at the pond. Is that clear? A good test would be to disconnect the discharge and run it and see if it still kicks out.

Have you actually ran it with an amp probe on it to see what's happening?

Danny

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