Risk of electric shock. Can shock, burn or kill. Unplug pump from power receptacle
before working on pump.
Symptom Probable Cause(s) Corrective Action
Pump won’t start or run.
Pump is not plugged in.
Check and see if pump is plugged in to a
proper outlet.
Blown fuse. If blown, replace with fuse of proper size.
Low line voltage.
If voltage under recommended minimum,
check size of wiring from main switch on
property. If OK, contact power company or
hydro authority.
Defective motor. Replace pump.
Defective float switch. Replace float switch.
Impeller.
If impeller won’t turn, remove lower pump
body and locate source of binding.
Float obstructed. Remove obstruction.
Pump starts and stops
too often.
Backflow of water from
piping.
Install or replace check-valve.
Faulty float switch. Replace float switch.
Pump won’t shut off.
Defective float switch. Replace float switch.
Restricted discharge (obstacle
or ice in piping).
Remove pump and clean pump and piping.
Float obstructed. Remove obstruction.
Restricted intake screen.
Remove the pump and clean the intake screen
and the impeller.
Pump operates but
delivers little or no
water.
Low line voltage.
If voltage under recommended minimum,
check size of wiring from main switch on
property. If OK, contact power company or
hydro authority.
Something caught in impeller. Remove the pump and clean out the impeller.
Worn or defective parts or
plugged impeller.
Cleanimpellerifplugged;otherwisereplace
pump.
Check valve installed without
vent hole.
Drill a 1/16” - 1/8” (1.6mm - 3.2mm) dia. hole
between pump discharge & check valve (1-2”
above where the discharge pipe screws into the
pump discharge and below the waterline).
Restricted intake screen.
Remove the pump and clean out the intake
screen.
Check valve is installed either
backward or upside down.
Be sure check valve is installed correctly.
Troubleshooting 7
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