A sump pump that is not draining water usually has a clogged intake, a blocked or frozen discharge line, a check valve stuck closed, a damaged impeller, or a power or float problem. Listening to the pump helps narrow it down. A pump that hums or runs points to a flow problem. A pump that stays silent points to power or the float.
If the Pump Is Running
When the motor runs but the pit stays full, water is not getting out. Unplug the pump and check the intake screen at its base for mud, gravel, or debris. Then follow the discharge pipe outside. The end should be clear of leaves, dirt, snow, and ice, and not crushed.
The Check Valve
The check valve on the discharge pipe should let water flow out but not back in. If it is stuck shut, or was installed with its arrow pointing the wrong way, the pump strains without moving water. The motor may sound louder than usual.
The Impeller
The impeller is the spinning part that pushes water. If it cracks or comes loose from the motor shaft, the pump hums but nothing happens. That usually calls for a repair or a replacement pump.
If the Pump Is Silent
Check for a tripped breaker or ground fault outlet, but only if the floor and the area around the outlet are dry. With the pump unplugged, make sure the float can rise freely and is not stuck in the down position.
Letting a pump run without moving water can burn out the motor, so unplug it if it keeps running with no result.
If the cause is not obvious, the pump and its plumbing can be tested and repaired. While a plumber is there, a look at where the discharge water ends up can prevent it from flowing back toward the house. Call JPR Plumbing at (833) 603-1840.