Sump Pump is not plugged in.	Make sure sump pump is plugged into a proper outlet.
Blown fuse.	Replace the fuse with a fuse of proper size.
Low line voltage.	Check the size of the wiring on the circuit feeding the pump and from the main switch on the property. If everything is OK, contact your power company or hydro authority.
Defective motor.	Replace the sump pump.
Defective float switch.	Replace the float switch.
Clogged or jammed Impeller.	If the impeller won’t turn, unplug the pump, remove the lower pump body, and locate the source of the binding. Replace the impeller if necessary.

Backflow of water from piping.	Install or replace the check valve.
Faulty switch.	Replace the switch.

Defective switch.	Replace the switch, after first checking that switch is functional.
Restricted discharge (obstacle or ice in the piping).	Unplug the pump, remove it from the sump, and clean the pump and piping.
Restricted intake screen.	Unplug the pump, remove it from the sump, and clean the intake screen and impeller.

Low line voltage.	If the voltage is below 110 volts, check the size of the wiring from the main switch on the property. If OK, contact your power company or hydro authority.
Debris caught in the impeller.	Remove the pump and clean out the impeller.
Worn or defective parts or plugged impeller.	Clean the impeller if it’s plugged; replace the impeller if necessary; otherwise replace the pump.
Restricted intake screen.	Remove the pump and clean out the intake screen.
Check valve is installed either backward or upside down.	Be sure the check valve is installed correctly (the flow arrow should point away from the pump).

Sump Pump Troubleshooting Tips

My Sump Pump Is Not Working