Liberty Pumps 240 Series User manual

Installation Manual
7000 Apple Tree Avenue
Bergen, NY 14416
ph: 800-543-2550
fax: [phone]
www.LibertyPumps.com
Copyright © Liberty Pumps, Inc. 2019 All rights reserved.
7108000J
Submersible Sump Pumps
Models
240-Series 1/4 hp Cast Iron
240 Switchless (Manual)
241 Wide-Angle Float Switch
243 Wide-Angel Float Switch with Piggyback Plug
247 Vertical Magnetic Float Switch
230-Series 1/3 hp Poly/Aluminum
230 Switchless (Manual)
231 Wide-Angle Float Switch
233 Wide-Angel Float Switch with Piggyback Plug
237 Vertical Magnetic Float Switch
450-Series 1/2 hp Poly/Aluminum
450 Switchless (Manual)
451 Wide-Angle Float Switch
453 Wide-Angel Float Switch with Piggyback Plug
457 Vertical Magnetic Float Switch

2 | EN Copyright © Liberty Pumps, Inc. 2019 All rights reserved. 7108000J
Contents
Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 | EN
Model Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 | EN
Inspection and Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 | EN
Pump Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 | EN
Pump System Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 | EN
Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 | EN
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 | EN
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 | EN
Maintenance and Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 | EN
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 | EN
Safety Guidelines
This safety alert symbol is used in the manual and on the pump to alert of potential risk for serious injury
or death.
This safety alert symbol identifies risk of electric shock. It is accompanied with an instruction intended to
minimize potential risk of electric shock.
This safety alert symbol identifies risk of fire. It is accompanied with an instruction intended to minimize
potential risk of fire.
This safety alert symbol identifies risk of serious injury or death. It is accompanied with an instruction
intended to minimize potential risk of injury or death.
Warns of hazards which, if not avoided, will result in serious injury or death.
Warns of hazards which, if not avoided, could result in serious injury or death.
Warns of hazards which, if not avoided, could result in minor or moderate injury.
Signals an important instruction related to the pump. Failure to follow these instructions could result in
pump failure or property damage.
Read every supplied manual before using pump system. Follow all the safety instructions in
manual(s) and on the pump. Failure to do so could result in serious injury or death.
Installer: manual must remain with owner or system operator/maintainer.
Record information from pump nameplate:
Keep this manual handy for future reference.
Pump Model #:
For replacement manual, visit LibertyPumps.com,
or contact Liberty Pumps at 1-800-543-2550. Pump Serial #:
Retain dated sales receipt for warranty.
Manufacture Date:
Install Date:

7108000J Copyright © Liberty Pumps, Inc. 2019 All rights reserved. 3 | EN
Safety Precautions
Accidental contact with electrically live parts, items, fluid, or
water can cause serious injury or death.
Always disconnect pump(s) from power source(s) before
handling or making any adjustments to either the pump(s),
the pump system, or the control panel.
All installation and maintenance of pumps, controls,
protection devices, and general wiring shall be done by
qualified personnel.
All electrical and safety practices shall be in accordance with
the National Electrical Code®, the Occupational Safety and
Health Administration, or applicable local codes and
ordinances.
Do not remove cord and strain relief, and do not connect
conduit to pump.
Pump shall be properly grounded using its supplied
grounding conductor. Do not bypass grounding wires or
remove ground prong from attachment plugs. Failure to
properly ground the pump system can cause all metal
portions of the pump and its surroundings to become
energized.
Do not handle or unplug the pump with wet hands, when
standing on damp surface, or in water unless wearing
Personal Protective Equipment.
Always wear dielectric rubber boots and other applicable
Personal Protective Equipment (PPE) when water is on the
floor and an energized pump system must be serviced, as
submerged electrical connections can energize the water. Do
not enter the water if the water level is higher than the PPE
protection or if the PPE is not watertight.
Do not lift or carry a pump or a float assembly by its power
cord. This will damage the power cord, and could expose the
electrically live wires inside the power cord.
The electrical power supply shall be located within the length
limitations of the pump power cord, and for below grade
installations it shall be at least 4 ft (1.22 m) above floor level.
Do not use this product in applications where human contact
with the pumped fluid is common (such as swimming pools,
fountains, marine areas, etc.).
Protect the power and control cords from the environment.
Unprotected power and control (switch) cords can allow
water to wick through ends into pump or switch housings,
causing surroundings to become energized.
Do not use an extension cord to power the product.
Extension cords can overload both the product and extension
cord supply wires. Overloaded wires will get very hot and can
catch on fire.
This product requires a separate, properly fused and
grounded branch circuit, sized for the voltage and amperage
requirements of the pump, as noted on the nameplate.
Overloaded branch circuit wires will get very hot and can
catch on fire. When used, electrical outlets shall be simplex of
the appropriate rating.
For cord replacement: power cord must be of the same
length and type as originally installed on the Liberty Pumps
product. Use of incorrect cord may lead to exceeding the
electrical rating of the cord and could result in death, serious
injury, or other significant failure.
Do not use this product with or near flammable or explosive
fluids such as gasoline, fuel oil, kerosene, etc. If rotating
elements inside pump strike any foreign object, sparks may
occur. Sparks could ignite flammable liquids.
Sewage and effluent systems produce and may contain
flammable and explosive gases. Prevent introduction of
foreign objects into basin as sparks could ignite these gases.
Exercise caution using tools and do not use electronic devices
or have live, exposed electrical circuits in or around basins,
open covers and vents.
These pumps are not to be installed in locations classified as
hazardous in accordance with the National Electric Code®,
ANSI/NFPA 70.
Do not modify the pump/pump system in any way.
Modifications may affect seals, change the electrical loading
of the pump, or damage the pump and its components.
All pump/pump system installations shall be in compliance
with all applicable Federal, State, and Local codes and
ordinances.
Do not allow children to play with the pump system.
Do not allow any person who is unqualified to have contact
with this pump system. Any person who is unaware of the
dangers of this pump system, or has not read this manual,
can easily be injured by the pump system.
Vent basin in accordance with local code. Proper venting of
sewer and effluent gases alleviates poisonous gas buildup
and reduces the risk of explosion and fire from these
flammable gases.
Wear adequate Personal Protective Equipment when working
on pumps or piping that have been exposed to wastewater.
Sump and sewage pumps often handle materials that can
transmit illness or disease upon contact with skin and other
tissues.
Do not remove any tags or labels from the pump or its cord.
Keep clear of suction and discharge openings. To prevent
injury, never insert fingers into pump while it is connected to
a power source.
Do not use this product with flammable, explosive, or
corrosive fluids. Do not use in a flammable and/or explosive
atmosphere as serious injury or death could result.
This product contains chemicals known to the State of
California to cause cancer and birth defects or other
reproductive harm. www.p65warnings.ca.gov.
Do not dispose of materials such as paint thinner or other
chemicals down drains. Doing so could chemically attack and
damage pump system components and cause product
malfunction or failure.
Do not position the pump float directly under the inlet from
drain tile or in the direct path of any incoming water.
Keep pump upright.
RISK OF ELECTRIC SHOCK
RISK OF FIRE
RISK OF SERIOUS INJURY OR DEATH

4 | EN Copyright © Liberty Pumps, Inc. 2019 All rights reserved. 7108000J
Do not use pumps with fluid over 140°F (60°C). Operating the
pump in fluid above this temperature can overheat the pump,
resulting in pump failure.
Do not use pump system with mud, sand, cement,
hydrocarbons, grease, or chemicals. Pump and system
components can be damaged from these items causing
product malfunction or failure. Additionally, flooding can
occur if these items jam the impeller or piping.
Do not introduce any consumer item that is not toilet paper
into a non-grinder (dewatering, effluent, sewage) pump/
pump system. This includes, but is not limited to the
following: feminine products, wipes, towels, towelettes,
dental floss, swabs, pads, etc. Items such as these put the
pump under undo strain and can result in pump/pump
system failure. Additionally, it creates conditions for
discharge line blockage.
Do not run dry.
Do not allow pump to freeze.
At no time shall the pump be stored within an incomplete wet
pit. The pump shall not be placed into the pit until it can be
fully operational.
Model Specifications
For complete listing of models and their specifications, refer to
http://www.LibertyPumps.com/About/Engineering-Specs. Pump
nameplate provides a record of specific pump information.
Inspection and Storage
Initial Inspection
The pump should be immediately inspected for damage that may
have occurred in shipment.
1. Visually check the pump and any spare parts for damage.
2. Check for damaged electrical wires, especially where they exit
the motor housing.
Contact Liberty Pumps customer service to report any damage or
shortage of parts.
Storage Before Use
Protect the power and control cords from the environment.
Unprotected power and control (switch) cords can allow
water to wick through ends into pump or switch housings,
causing surroundings to become energized.
At no time shall the pump be stored within an incomplete wet
pit. The pump shall not be placed into the pit until it can be
fully operational.
Do not allow the pump to freeze.
Pumps are shipped from the factory ready for installation and use.
Hold the pump in storage if the pump station is not complete.
If storage is necessary, the pump should remain in its shipping
container. It should be stored in a clean, dry temperature-stable
environment where the pump and its container are covered to
protect it from water, dirt, vibration, etc. The cord ends must be
protected against moisture.
Uninstalled pumps that are idle for greater than three months
should have impellers manually rotated once a month to lubricate
the seals.
Installed pumps that are idle for greater than one month should
have impellers manually operated through the breaker panel once
a month to lubricate the seals. For automatic models, turn off the
breaker, unplug the piggyback switch, and plug the pump directly
into receptacle. Turn the breaker on for 30 seconds, then turn the
breaker off. Plug the piggyback switch back in. Refer to Figure 1
on page 6.
Pump Design
Liberty Pumps provides an integral anti-airlock hole in the volute
housing of submersible pumps. Airlock occurs when air gets
trapped in the volute/impeller area of the pump and cannot
escape due to the water column above the check valve on the
discharge line. When the basin fills with water and the pump is
called to activate, the impeller spins in this pocket of air and
cannot prime. An anti-airlock hole allows this trapped air to
escape, allowing the pump to prime and start pumping.
General Information
Before installation, read these instructions carefully.
Each Liberty Pumps product is individually factory
tested to ensure proper performance. Closely
following these instructions will eliminate potential
operating problems, assuring years of trouble-free
service.
These pumps are to be used for drain (storm) water.
Pumps are certified to CSA® and UL® standards.
Provide pump serial number in all correspondence.
Pumps must be serviced at a qualified repair facility
approved by Liberty Pumps. No repair work should
be carried out during the warranty period without
prior factory approval. Any unauthorized field
repairs void warranty. Contact Liberty Pumps at
1-800-543-2550 to locate the closest authorized
service center.
Operating Constraints
It is extremely important to verify that the pump
has been sized correctly for the intended
installation. The operating point of the pump must
lie within the acceptable range as outlined by the
applicable Liberty Pumps performance chart.
Operating the pump outside of the recommended
range can invalidate the CSA Certification of the
pump and can also cause damage and premature
failure. Operating outside of the recommended
range can cause the pump to exceed its rated
nameplate amp draw, which will void the pump
certification. It can also cause motor overheating,
cavitation, excessive vibration, clogging, and poor
energy efficiency.
RISK OF ELECTRIC SHOCK

7108000J Copyright © Liberty Pumps, Inc. 2019 All rights reserved. 5 | EN
A small spray of water from this hole is normal while pump is
running. Bleeding off the air could take from several seconds to
more than a minute once the pump starts.
For added protection, consider the addition of a back-up pump,
such as Liberty Pumps SJ10 SumpJet as well as alarm ALM-P1 or
ALM-2 in applications where loss of pump function could result in
property damage. If an alarm is used, it must be connected to a
separate electrical circuit.
Pump System Components
Float Switches
Automatic Models
Models 243, 233, and 453 come with two cords—one to the float
switch and the other to the pump motor. The switch cord has a
series (piggyback) plug enabling the pump motor cord to be
plugged into the back of it. The purpose of this design is to allow
temporary manual operation of the pump.
For manual operation, or in the event of switch failure, the pump
cord can be separated and plugged into the electrical outlet,
directly bypassing the switch. Refer to Piggyback Switch
Operation on page 6.
Switchless (Manual) Models
Manual pumps with no switch may be operated by directly
plugging into an approved electrical outlet. To prevent excessive
seal wear and overheating, pumps should not be run dry for
extended periods of time. A minimum 4-1/2” water level is
recommended. If manual models are to be used with an optional
control device, follow the instructions provided with the control
and make power connections per those instructions. Set the turn
OFF level at 4-1/2” or greater.
Vertical Magnetic Float Models
Do not remove float rods from VMF models for manual use as
switch damage will result.
Preparation
For ordinary ground water pumping applications, the sump basin
diameter should be a minimum of 14” (minimum of 10” for
models 247, 237, and 457). A larger diameter pit is preferred as it
allows for longer pump cycling and reduced switch cycling. The
depth of the pit should be at least 12” above the surface on which
the pump is resting. A sump basin cover is required for safety and
to prevent foreign objects from entering the basin.
Prepare Existing Sump [Basin]
Always disconnect pump(s) from power source(s) before
handling or making any adjustments to either the pump(s),
the pump system, or the control panel.
If replacing a previously installed pump, prepare the basin by
removing the old pump. Separate the discharge pipe at either the
check valve or at the union. If neither a check valve nor a union is
part of the existing discharge pipe, cut the pipe with a hacksaw
and remove the pump. A check valve and optional union will need
to be installed at this cut.
Clean any debris from the basin. Inspect all remaining equipment
in the basin including piping, valves, and electrical junction boxes
(if present) and repair or replace as appropriate.
If the basin is not already enclosed on the bottom, provide a hard
level bottom of bricks or concrete. Do not place the pump directly
on earth, gravel, or debris since this can cause excessive wear of
the impeller and possible jamming. “The Brick” (Liberty Pumps
#4445000) is a pre-molded stable platform designed to fit the
submersible pump. It raises the pump 2-1/2” off the bottom of the
basin, reducing the potential for jamming from rocks and debris.
Contact a local distributor to order.
Prepare New Sump [Basin]
Excavation
Locate all overhead and underground utilities before
excavating.
Excavate the hole as small as possible, with a minimum
recommended 8” diametrical clearance around the tank. Never
place the basin directly in contact with rocks or other sharp
objects. Place only fine, 1/8” to 3/4” pea gravel or 1/8” to 1/2”
washed, crushed stone as bedding between the basin and the
hole walls. Do not use sand or native soil as backfill. Properly
compact underneath the basin to provide a solid, level base that
can support the weight of the filled basin.
Inlet Connection & Initial Backfill
Use only fine, 1/8” to 3/4” pea gravel or 1/8” to 1/2” washed,
crushed stone around the bottom of the basin to hold it in place.
Do not use sand or native soil as backfill.
Make the inlet connection as required per basin.
Final Backfill
Keep large rocks, clods, and foreign objects out of the backfill
material. Only fine, 1/4” to 3/4” pea gravel, or 1/8” to 1/2” washed,
crushed stone is recommended. Do not use sand or native soil as
backfill. Mound the backfill slightly and allow for natural settling.
Provide access to the basin cover for maintenance and service.
Compaction of backfill materials must be adequate to ensure the
support of the tank, and to prevent movement or settlement.
Do not exert heavy pressure or run heavy equipment on the
backfill material as this could cause the tank to collapse.
Anti-Airlock
To speed or assist with air
bleed in the event of airlock,
the addition of a 1/8” hole in
the discharge pipe is
recommended. This hole
should be no more than 1/8”
diameter and drilled low on
the pipe—just above the
threaded connection to the
pump discharge. Refer to
figure.
RISK OF FIRE
RISK OF SERIOUS INJURY OR DEATH
Drill 1/8” anti-
airlock hole into
DISCHARGE PIPE
Water spray from
this hole is normal
Discharge pipe

6 | EN Copyright © Liberty Pumps, Inc. 2019 All rights reserved. 7108000J
Installation
All installation and maintenance of pumps, controls,
protection devices, and general wiring shall be done by
qualified personnel.
All electrical and safety practices shall be in accordance with
the National Electrical Code®, the Occupational Safety and
Health Administration, or applicable local codes and
ordinances.
Pump
Record information from pump nameplate onto inside cover of
these instructions. Complete a visual inspection before lowering
into basin.
Place pump in basin being sure any mounting interface (i.e., “The
Brick” platform, torque stop) is engaged correctly.
Models with wide-angle float switches must have adequate
clearance to side wall of basin with free, unobstructed movement
throughout its complete travel and must not contact the pump,
piping, or other objects.
Discharge
Make all discharge connections. A 1-1/2” NPT threaded discharge
is provided for connection of the discharge pipe. Do not reduce
the discharge size to less than 1-1/4”, as this will affect pump flow
and performance. Schedule 40 PVC pressure pipe is
recommended; however, flexible discharge hose kits may be used
for temporary installations. Connect pipe or discharge hose to the
discharge of the pump. Hand-tighten only as over-tightening can
damage the pump discharge.
Install a union or other means of separating the discharge pipe
just above the floor to facilitate removal of the pump if necessary.
A check valve is required to prevent the backflow of liquid after
each pumping cycle. A gate valve should follow the check valve to
allow periodic cleaning of the check valve or removal of the pump.
The remainder of the discharge line should be as short as possible
with a minimum number of turns to minimize friction head loss.
Do not reduce the discharge to below the pump outlet size.
Larger pipe sizes may be required to eliminate friction head loss
over long runs.
Vent
Vent basin in accordance with applicable plumbing codes.
Piggyback Switch Operation
IMPORTANT: Verify breaker is turned off before plugging in the
switch.
Plug the piggyback switch into the outlet receptacle. Plug the
pump into the piggyback receptacle.
Figure 1. Piggyback Switch Operation
Operation
Starting System
1. Verify all plumbing components are installed correctly and
functional. Verify all valves are open and ready for pump use.
2. Double check all wire connections. Re-tighten all factory and
field connections.
3. Ensure pump has no obstructions.
4. With all electrical and mechanical connections complete and
secure, turn on power to pump.
5. Verify operation of the pump and floats.
6. Run several cycles of water through the system to verify
correct control operation for the installation.
Be certain to complete adequate testing, especially on systems
with multiple pumps or custom control configurations.
Maintenance and Troubleshooting
Accidental contact with electrically live parts, items, fluid, or
water can cause serious injury or death.
Always disconnect pump(s) from power source(s) before
handling or making any adjustments to either the pump(s),
the pump system, or the control panel.
Wear adequate Personal Protective Equipment when working
on pumps or piping that have been exposed to wastewater.
Sump and sewage pumps often handle materials that can
transmit illness or disease upon contact with skin and other
tissues.
Maintenance
Pump should be checked frequently for debris and/or build up
that may interfere with pump or float switch operation. The float
must be able to move freely through its complete travel without
any restrictions. Pour enough water into the sump to activate the
pump periodically (at least every 3 months) when not normally in
use to verify proper function. Check periodically to make sure the
pit is free from accumulated debris, rocks or other objects that
may potentially jam the pump.
In the event the pump becomes clogged, the inlet screen can be
removed to gain access to the pump impeller. Once the
obstruction is removed, the anti-airlock hole should be cleaned.
As the motor is oil-filled, no lubrication or other maintenance is
required.
Troubleshooting
No repair work shall be carried out during the warranty period
without prior factory approval. To do so may void the warranty.
Liberty Pumps, Inc. assumes no responsibility for damage or injury
due to disassembly in the field. Disassembly, other than an
authorized repair facility approved by Liberty Pumps or its
authorized service centers, automatically voids warranty.
RISK OF ELECTRIC SHOCK
Temporary Manual
Operation
YES!NO!
RISK OF ELECTRIC SHOCK
RISK OF SERIOUS INJURY OR DEATH

7108000J Copyright © Liberty Pumps, Inc. 2019 All rights reserved. 7 | EN
Table 1. Troubleshooting Matrix
Problem Possible Cause Corrective Action
Pump does not start.
Tripped circuit breaker, tripped GFCI, blown fuse,
or other interruption of power.
Reset tripped circuit breaker, reset GFCI, replace blown
fuse with properly sized fuse, check that the unit is
securely plugged in, investigate power interruption.
Improper voltage. Have an electrician check all wiring for proper
connections and adequate voltage and capacity.
Defective motor. Consult Liberty Pumps.
Low line voltage. Check voltage. If under 108 V, check wiring size.
Remove extension cord, or use with heavier gauge.
Float switch unable to move to PUMP ON
position due to interference in basin or other
obstruction.
Position the pump or float switch so that it has adequate
clearance for free movement.
Insufficient liquid level. Verify the liquid level is allowed to rise enough to
activate float switch.
Defective float switch. Replace float switch.
Obstructed impeller or volute. Remove obstruction.
Loose wiring connections. Check and tighten all connections.
Pump runs, but does
not turn off.
Pump airlocked. Turn pump off and let set for several minutes, then
restart.
Float switch unable to move to PUMP OFF
position due to interference with the side of
basin or other obstruction.
Position the pump or float switch so that it has adequate
clearance for free movement.
Defective float switch. Replace float switch.
Pump runs or hums, but
does not pump.
Discharge line blocked or restricted. Check the discharge line for foreign material, including
ice if the discharge line passes through or into cold areas.
Check valve stuck closed or installed backward. Remove check valve and examine for freedom of
operation and proper installation.
Gate or ball valve closed. Open gate or ball valve.
Total head (lift height) beyond pump's capability. Route piping to a lower level. If not possible, a larger
pump may be required. Consult Liberty Pumps.
Obstructed impeller or volute; clogged inlet
screen. Remove obstruction.
Pump airlocked.
Turn pump off and let set for several minutes, then
restart.
Clear anti-airlock hole.
Pump does not deliver
proper capacity.
Discharge partially closed or clogged. Check the discharge line for foreign material, including
ice if the discharge line passes through or into cold areas.
Check valve partially clogged. Raise liquid level up and down to clear; remove check
valve to remove obstruction.
Total head (lift height) beyond pump's capability. Route discharge piping to a lower level. If not possible, a
larger pump may be required. Consult Liberty Pumps.
Low liquid level. Check liquid level.
Obstruction in pump or piping. Remove obstruction.
Pump runs periodically
when fixtures are not in
use.
Check valve not installed, stuck open, or leaking. Install check valve; remove check valve and examine for
freedom of operation and proper installation.
Fixtures leaking. Repair fixtures as required to eliminate leakage.

8 | EN Copyright © Liberty Pumps, Inc. 2019 All rights reserved. 7108000J
Warranty
Liberty Pumps Wholesale Products Limited Warranty
Liberty Pumps, Inc. warrants that Liberty Pumps wholesale products are free from all factory defects in material and workmanship for a
period of three (3) years from the date of purchase (excluding batteries). The date of purchase shall be determined by a dated sales
receipt noting the model and serial number of the pump. The dated sales receipt must accompany the returned pump if the date of
return is more than three years from the date of manufacture noted on the pump nameplate.
The manufacturer's sole obligation under this Warranty shall be limited to the repair or replacement of any parts found by the
manufacturer to be defective, provided the part or assembly is returned freight prepaid to the manufacturer or its authorized service
center, and provided that none of the following warranty-voiding characteristics are evident:
The manufacturer shall not be liable under this Warranty if the product has not been properly installed, operated, or maintained per
manufacturer instructions; if it has been disassembled, modified, abused, or tampered with; if the electrical cord has been cut, damaged,
or spliced; if the pump discharge has been reduced in size; if the pump has been used in water temperatures above the advertised rating;
if the pump has been used in water containing sand, lime, cement, gravel, or other abrasives; if the product has been used to pump
chemicals, grease, or hydrocarbons; if a non-submersible motor has been subjected to moisture; or if the label bearing the model and
serial number has been removed.
Liberty Pumps, Inc. shall not be liable for any loss, damage, or expenses resulting from installation or use of its products, or for indirect,
incidental, and consequential damages, including costs of removal, reinstallation or transportation.
There is no other express warranty. All implied warranties, including those of merchantability and fitness for a particular purpose, are
limited to three years from the date of purchase. This Warranty contains the exclusive remedy of the purchaser, and, where
permitted, liability for consequential or incidental damages under any and all warranties are excluded.
Pump runs or hums, but
does not pump.
Discharge line blocked or restricted. Check the discharge line for foreign material, including
ice if the discharge line passes through or into cold areas.
Check valve stuck closed or installed backward. Remove check valve and examine for freedom of
operation and proper installation.
Gate or ball valve closed. Open gate or ball valve.
Total head (lift height) beyond pump's capability. Route piping to a lower level. If not possible, a larger
pump may be required. Consult Liberty Pumps.
Obstructed impeller or volute; clogged inlet
screen. Remove obstruction.
Pump airlocked.
Turn pump off and let set for several minutes, then
restart.
Clear anti-airlock hole.
Pump cycles too
frequently.
Improper float switch setting. Adjust float switch setting.
Check valve not installed, stuck open, or leaking. Install check valve; remove check valve and examine for
freedom of operation and proper installation.
Repeated tripping.
Circuit protection underrated. Check rating and replace with proper size.
Other appliance on same circuit. Pump requires separate circuit.
Pump connected to an extension cord or wiring
is inadequate or compromised. Have an electrician check for proper wiring.
Improper voltage. Have an electrician check all wiring for proper
connections and adequate voltage and capacity.
Obstruction in pump. Remove obstruction.
Foreign matter buildup. Clean motor housing.
Defective motor. Consult Liberty Pumps.
Table 1. Troubleshooting Matrix (continued)
Problem Possible Cause Corrective Action