A sump pump that runs without removing water usually has a clogged intake screen, a blocked or frozen discharge pipe, a check valve that is stuck closed or installed backward, or a broken impeller. In every case the motor is working, but the water has no clear path out of the pit.
Before checking anything, never reach into the pit while the pump has power. Unplug it first, and only handle cords and outlets with dry hands while standing on a dry floor.
Look at the Intake
The pump draws water through a screen near its base. Silt, gravel, and small debris can clog it, especially in pits that are rarely cleaned. With the pump unplugged, lift it slightly if you can and clear away what you see.
Follow the Discharge Pipe
Trace the pipe from the pump to where it exits the house. Outside, make sure the end is not buried, crushed, packed with leaves, or frozen. A long or uphill discharge run can also strain a smaller pump.
Check the Check Valve
The check valve sits on the discharge pipe and should only let water flow outward. If it is stuck shut, or the arrow on its body points the wrong way, the pump strains but cannot push water out. You may hear the motor working harder than usual.
Consider the Impeller
The impeller spins to move water. If it cracks or slips off the motor shaft, the pump hums and runs while the pit stays full. That usually means a repair or a replacement pump.
Letting a pump run dry can burn out the motor, so unplug it if nothing is moving. Each part from the intake to the discharge can be tested to find the fault. You might also ask about upgrades to the discharge and drainage setup. Call JPR Plumbing at (833) 603-1840.