Take pump out of pit and inspect the unit for debris caught in the impeller of motor. This is where the suction is created to pull water through assembly and send it out.
There should be a check valve within close vicinity of the pump; is there a small hole drilled in the drain line within the first six inches of this pump to relieve the water from the check valve to pump in the off position?
This is required on all zoeller pumps; whether sump or sewage. This protects the pump from waterlock, which will cause the same problem you are experiencing.
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Steve @ Dunbar Plumbing
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