A sump pump that is not draining water usually has a clogged intake screen, a blocked or frozen discharge line, a stuck check valve, a damaged impeller, or a power problem. If the pump is running but the pit stays full, the issue is likely with water flow. If the pump is silent, power or the float switch is the more likely cause.
Clogged Intake
The pump pulls water through a screen at its base. Mud, gravel, and debris in the pit can block it. Unplug the pump before checking, then clear any material you can see. A pit that collects a lot of silt may need a regular cleaning.
Discharge Line Problems
The discharge pipe carries water outside. If it is clogged with debris, crushed, or frozen in winter, water has nowhere to go. Check the outlet outside to make sure it is not buried in snow, ice, leaves, or dirt.
Check Valve Issues
The check valve keeps water from flowing back into the pit. If it is stuck closed or was installed backward, the pump will run but cannot push water out. You may hear the motor straining.
Impeller or Power Problems
The impeller is the spinning part that moves water. If it breaks or comes loose, the pump hums but does nothing. If there is no sound at all, check for a tripped breaker or outlet, but only if the area is dry. Also make sure the float is not stuck in the down position.
Running a pump that is not moving water can burn out the motor. Unplug it if it keeps running without results.
If you cannot find the cause, the pump can be tested and whatever is blocking it fixed. A pump check is also a chance to look at the discharge setup and nearby drains. Call JPR Plumbing at (833) 603-1840.