Our pump will run for an hour or so and then it shuts down.
This same symptom happened to me.Check the impeller, if you can pull it out or it just sloshes around in the well housing, then the impeller lock has come out of it's place. Simply pull off the outer intake grill, then twist off the outlet housing. Now you can see that white notched washer and how it must be seated and aligned. Once seated in place use a small screwdriver to turn and lock it in. Now you will see your impeller shaft is no longer loose.
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