A sump pump running every 2 minutes after a rainstorm is typically caused by heavy groundwater saturation continuously feeding into your perimeter drain tiles and filling the basin rapidly. However, if this frequent cycling persists long after the rain has stopped, it indicates a failed or missing check valve on the discharge pipe. When the check valve fails, water trapped inside the vertical discharge pipe flows right back down into the sump pit, refilling it and causing the pump to cycle endlessly. Verification: Inspect the exterior discharge pipe check valve to ensure the internal flapper moves freely and prevents backflow.
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