If pump does not run and hums, check the following:

1. Check line circuit breaker is off, or fuse is burned or loose.
2. Check water level in sump has not reached turn-on level.
3. Check pump cord is not making contact in receptacle.
4. Check float is stuck. It should operate freely in basin.
5. Check if all of the above are OK, then the motor could be malfunctioning.

If pump runs but does not deliver water, check the following:

1. Check valve is installed backwards. Arrow on valve should point in direction of flow.
2. Discharge shut-off valve (if used) may be closed.
3. Impeller or volute openings are fully or partially clogged. Remove pump and clean.
4. Pump is air-locked. Start and stop several times by plugging and unplugging cord. Check for clogged vent hole in pump case. Drill a 1/8 inch hole into PVC discharge pipe.
5. Inlet holes in pump base are clogged. Remove pump and clean the openings.
6. Vertical pumping distance is too high. Reduce distance or change the discharge fittings of the pump.

If pump runs and pumps out sump, but does not stop, check the following:

1. Float is stuck in up position. Be sure float operates freely in basin.
2. Defective float switch. Replace with float switch.
3. Defective vertical switch. Replace with vertical switch.

If pump runs but only delivers a small amount of water, check the following:

1. Pump is air-locked. Start and stop several times by plugging and unplugging cord. Check for clogged vent hole in pump case. Drill a 1/8 inch hole into PVC discharge pipe.
2. Vertical pumping distance is too high. Reduce distance or change the discharge fitting of the pump. Inlet holes in pump base are clogged. Remove pump and clean the strainer and openings.
3. Impeller or volute openings are fully or partially clogged. Remove pump and clean.
4. Pump impeller is partially clogged, causing motor to run slow and overload Remove pump and clean.

If fuse blows or circuit breaker trips, check the following:

1. Pump impeller is partially clogged, causing motor to run slow and overload. Remove pump and clean.
2. Motor stator may be defective.
3. Fuse size or circuit breaker may be too small. (Must be 15 amps).
4. Impeller or volute opening are fully or partially clogged. Remove pump and clean.

If motor runs for a short time then stops, check the following:

1. Inlet holes in pump base are clogged. Remove pump and clean the openings.
2. Pump impeller is partially clogged, causing motor to run slow and overload. Remove pump and clean.
3. Motor stator may be defective.
4. Impeller or volute openings are fully or partially clogged. Remove pump and clean also clean the strainer if you had installed.