Sump pump short cycling—where the unit turns on and off rapidly every few seconds or minutes—is typically caused by a faulty, stuck, or missing check valve allowing discharged water to flow right back into the pit, an undersized sump pit basin holding too little water volume, or a float switch positioned incorrectly. When discharged water rushes back into the basin, it immediately triggers the float switch to turn the pump back on, creating an endless, wearing loop. Verification: Inspect the discharge pipe check valve to ensure the internal flapper moves freely and prevents water backflow.
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