Troubleshooting - Little Giant 9EC Series Owner's Manual

Troubleshooting

Problem
Pump not plugged in
Circuit breaker off or fuse removed
Accumulation of trash on float
Pump does not turn
on
Float obstruction
Defective switch
Defective motor
Float or float rod obstruction
Pump will not shut
Pump is air locked.
off
Liquid inflow matches pump capacity.
Defective switch
Check valve installed backwards
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 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
Pump cycles
continuously Check valve leaking
Basin too small for inflow
There should be a bleed hole in the dis-
charge pipe that allows trapped air to
Water sprays out of
escape from the pump, preventing air
a hole in the
lock.
discharge pipe.
Water spraying out of this hole is com-
pletely normal.
Probable Causes Corrective Action
Plug in pump.
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.
Check that supply voltage matches the nameplate
rating.
Pull pump and clean. Check pipe for scale or cor-
rosion.
Replace pump.
Install a check valve in discharge line.
Inspect check valve for correct operation.
Install larger basin.
No corrective action is required.
MAINTENANCE
Troubleshooting
9