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Troubleshooting
Problem
Pump not plugged in
Circuit breaker off or fuse removed
Pump does
Accumulation of trash on float
not turn on
Float obstruction
Defective switch
Defective motor
Float or float rod obstruction
Pump will
Pump is air locked
not shut off
Liquid inflow matches pump capacity
Defective switch
Check valve installed backwards
Pump runs
Check valve stuck or plugged
but does not
discharge
Lift too high for pump
liquid
Inlet to impeller plugged
Pump is air locked
Lift too high for pump
Rotation incorrect (3-phase only)
Pump does
not deliver
Low voltage, speed too slow
rated
capacity
Impeller or discharge pipe is clogged
Impeller wear due to abrasives
No check valve in long discharge pipe
allowing liquid to drain back into basin Install a check valve for correct operation.
Pump cycles
continuously
Check valve leaking
Basin too small for inflow
Water
There should be a bleed hole in the
sprays out of
discharge pipe that allows trapped air
a hole in the
to escape from the pump, preventing
discharge
air lock. Water spraying out of this
pipe.
hole is completely normal
Obstructed pump impeller
Protector
tripping
Pump air-locked
(motor
overloading/
overheating)
Excessively high or low voltage supply Refer to
Pump, motor, bearings, or seal have
reached the end of their useful life
Probable Causes
Corrective Action
Connect pump to a dedicated circuit equipped
with GFCI.
Turn on circuit breaker or replace fuse.
Clean float.
Check float path and provide clearance.
Replace switch.
Replace pump.
Check float and float rod path and provide clear-
ance.
Remove pump and clean air bleed hole.
Larger pump required.
Replace switch.
Check flow-indicating arrow on check valve body
to ensure proper installation.
Remove check valve and inspect for proper oper-
ation.
Check rated pump performance.
Pull pump and clean.
Remove pump and clean air bleed hole.
Check rated pump performance.
Switch any two of the line wires.
Check that supply voltage matches the name-
plate rating.
Pull pump and clean. Check pipe for scale or cor-
rosion.
Replace pump.
Inspect check valve for correct operation.
Install larger basin.
No corrective action is required.
Pull pump and clean. Check pipe for scale or cor-
rosion
Shut power off for approximately 1 minute, then
restart. Repeat several times to clear air from
pump. If this does not resolve the problem, clean
the vent hole. Refer to
"Specifications" on page
Replace pump.
MAINTENANCE
Troubleshooting
"Maintenance" on page
1.
8.
9
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