Troubleshooting Table - Liberty Pumps S30 Serie Manual De Instalación

Troubleshooting Table:

Problem
Pump will not run
or hum.
Pump runs or
hums but does
not remove
water.
Pump runs and
removes water
but does not shut
off.
Pump runs but
removes very
little water.
Circuit breaker
trips or fuse
blows when
pump starts.
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Cause
Blown fuse or other

interruption of power; improper
voltage.
Water level in pit may be too

low to activate switch.
Plug on power cord may not

be making contact in
receptacle.
Piggyback plugs may not be

connected tightly together.
Switch is defective Model S38

only.
Motor winding may be open.

Float switch obstructed Models

S37 and S38.
Check valve may be installed

backwards or is defective.
Discharge line may be blocked

or frozen.
Vertical lift is beyond pump's

capability.
Inlet screen of pump is

plugged or the impeller is
jammed.
Switch is defective or

obstructed.
Pump has met or exceeded its

maximum lift.
Vertical lift is approaching

pump's maximum lift capability
of 27'.
Pump's inlet is partially

blocked.
Discharge line is partially

blocked.
Check valve is not opening all

the way.
Fuse or breaker is too small.

Other major appliance is on

the same circuit.
Pump is connected to an

extension cord or wiring is
inadequate.
Defective motor or switch.

Correction
If blown, replace with properly sized fuse or reset

breaker; if voltage is under 108V, check wiring size.
Remove extension cord if connected.
Add more water to the pit.

Check security and connection. If receptacle is

corroded, have it replaced by a certified electrician.
Tighten connection of plugs.

Verify that water level is at least 4" above pump. To

test the switch, plug the power cord directly in to the
electrical receptacle bypassing the piggyback plug. If
pump operates, then the switch needs replacement.
(See Switch-Servicing procedures on page 5).
Consult factory.

The float must be free to move unobstructed – if

bound remove debris or position pump to prevent
float from rubbing on side wall of sump.
Make sure it's installed properly and flapper in valve

is free to move.
Make sure line doesn't pass through cold areas or

isn't blocked.
If possible, try to reduce the discharge head to a

lower height.
Remove the pump screen and clean inlet and

impeller.
Make sure switch is free from obstruction or replace

switch.
Route discharge piping to a lower level. If this isn't

possible then a larger pump may be required.
If possible, try to reduce the discharge head to a

lower height.
Remove volute and make sure inlet is clear of debris.

Remove blockage.

Remove blockage or make sure check valve is not

defective.
A 15-amp breaker should be used.

Pump should be on its own circuit.

Have an electrician check for proper wiring.

Consult factory.

5