Troubleshooting - Little Giant 12E Series Owner's Manual

MAINTENANCE

Troubleshooting

Cleaning Impeller and Volute
1. Remove the four bolts (1) that hold the volute to the motor housing.
Then separate the volute from the motor housing.
IMPORTANT: Do not remove the motor housing bolts or screws (2).
2. Clean the impeller and the volute passage.
3. Be sure the impeller turns freely.
4. Reattach the volute to the motor housing and secure it with the four
bolts.
Troubleshooting
Problem
Pump not plugged in.
Circuit breaker off or fuse
removed.
Accumulation of trash on float. Clean float.
Pump does not turn on
Float obstruction.
Defective switch.
Defective motor.
Float or float rod obstruction.
Pump is air locked.
Pump will not shut off
Liquid inflow matches pump
capacity.
Defective switch.
Check valve installed back-
wards.
Check valve stuck or plugged.
Pump runs but does
not discharge liquid Lift too high for pump.
Inlet to impeller plugged.
Pump is air locked.
Lift too high for pump.
Low voltage, speed too slow.
Pump does not deliver
Impeller or discharge pipe is
rated capacity
clogged.
Impeller wear due to abrasives. Replace pump.
No check valve in long dis-
charge pipe allowing liquid to
Pump cycles continu-
drain back into basin.
ously
Check valve leaking.
Basin too small for inflow.
There should be a bleed hole in
the discharge pipe that allows
Water sprays out of a
trapped air to escape from the
hole in the discharge
pump, preventing air lock.
pipe.
Water spraying out of this hole
is completely normal.
For technical assistance, parts, or repair, please contact:
800.701.7894 | littlegiant.com
Form 10000004899 Rev. 001 12/20
Probable Causes Corrective Action
Plug in pump.
Turn on circuit breaker or replace fuse.
Check float path and provide clearance.
Replace switch.
Replace pump.
Check float and float rod path and provide clearance.
Remove pump and clean air bleed hole.
Larger pump required.
Replace switch.
Check flow indicating arrow on check valve body to ensure proper installa-
tion.
Remove check valve and inspect for proper operation.
Check rated pump performance.
Pull pump and clean.
Remove pump and clean air bleed hole.
Check rated pump performance.
Check that supply voltage matches the nameplate rating.
Pull pump and clean. Check pipe for scale or corrosion.
Install a check valve in discharge line.
Inspect check valve for correct operation.
Install larger basin.
No corrective action is required.
Franklin Electric Co., Inc. | Oklahoma City, OK 73157-2010
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