A sump pump running constantly without stopping is typically caused by a stuck or tethered float switch trapped against the basin wall, a failed internal switch mechanism, a stuck check valve allowing discharged water to flow right back into the pit, or heavy groundwater flooding exceeding the pump's capacity. If the float cannot drop down, the electrical switch remains stuck in the ON position. Verification: Reach into the pit and manually adjust or free the float switch to see if the motor turns off.
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