Short cycling—where a sump pump turns on and off rapidly every few seconds—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, 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 backflow.
1 votes
Marked as accepted