Troubleshooting - Little Giant BSC33 Owner's Manual

Cleaning Impeller and Volute
1. Remove the screws that hold the base to the volute and separate the base and volute.
IMPORTANT: Do not remove the motor housing cover.
2. Clean the impeller and volute passage.
IMPORTANT: Do not use strong solvents on the impeller.
• Do not remove the impeller.
3. Ensure the impeller freely rotates after cleaning.
4. Reattach the base to the volute and secure it with the screws.

Troubleshooting

Problem
Pump does not turn on
Pump will not shut off
Pump runs but does not
discharge liquid
Pump does not deliver
rated capacity
Pump cycles continuously
Water sprays out of a hole
in the discharge pipe
Probable Causes
Pump not connected to electrical power
Circuit breaker off or fuse removed
Accumulation of trash on float
Float obstruction
Defective switch
Defective motor
Float or float rod obstruction
Pump is air locked
Liquid inflow matches pump capacity
Defective switch
Check valve installed backwards
Check valve stuck or plugged
Lift too high for pump
Inlet to impeller plugged
Pump is air locked
Lift too high for pump
Low voltage, speed too slow
Impeller or discharge pipe is clogged
Impeller wear due to abrasives
No check valve in long discharge pipe allow-
ing liquid to drain back into basin
Check valve leaking
Basin too small for inflow
There should be a bleed hole in the dis-
charge pipe that allows trapped air to escape
the pump, preventing air lock. Water spray-
ing out of this hole is completely normal
Troubleshooting
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
clearance.
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
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.
Replace pump.
Install a check valve for correct operation.
Inspect check valve for correct operation.
Install larger basin.
No corrective action is required.
MAINTENANCE
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