I totally missed that the pump and float were completely submerged by 3-4 inches of water and read it as if there were 3-4 inches of water in the pit and it was circulating.


Yes, the motor will create enough heat for the water to heat up. As far as it being air locked, I doubt it. With that much water above it, the pump would re-prime itself and begin pumping again. I would suspect a blockage ir damaged impeller on the pump itself.

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