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Troubleshooting Checklist
Problem
Pump does
not run or
hums
Pump runs but
does not
deliver water
Pump runs
and pumps out
sump, but
does not stop
Pump runs but
delivers only a
small amount
of water
Fuse blows or
circuit breaker
trips when
pump starts
16
• Line circuit breaker is off, or fuse is blown or loose.
• Water level in the sump has not reached turn-on level as
indicated in the installation drawing.
• Pump cord is not making contact in the receptacle.
• Float is stuck. It should operate freely in the basin.
• Debris may be stuck in the impeller.
• If all of the above are OK, then the motor winding may be open
or the capacitor may be defective.
• Check valve is installed backwards. Arrow on the valve should
point in the direction of flow.
• Discharge shut-off valve (if used) may be closed.
• Pump is air-locked. Start and stop several times by plugging and
unplugging cord. Check for clogged vent hole in pump case.
• Impeller or volute openings are fully or partially clogged.
Remove pump and clean.
• Inlet holes in pump base are clogged. Remove pump and clean
the openings.
• Vertical pumping distance is too high. Reduce distance or resize
pump.
• Float is stuck in the up position. Be sure the float operates freely
in the basin.
• Defective float switch.
• Pump is air-locked. Start and stop several times by plugging and
unplugging the cord.
• Check for a clogged vent hole in the pump case.
• Vertical pumping distance is too high. Reduce the distance or
resize the pump.
• Inlet holes in pump base are clogged. Remove pump and clean
the openings.
• Impeller or volute openings are fully or partially clogged.
Remove the pump and clean.
• Pump impeller is partially clogged, causing motor to run slow
and overload. Remove pump and clean.
• Motor stator may be defective.
• Fuse size or circuit breaker may be too small. Must be 15 amps.
• Impeller or volute openings are fully or partially clogged.
Remove pump and clean.
• Water lead inside the pump motor.
Possible Causes
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