Liberty Pumps 700-Series - Manual (Page 8)

©Copyright 2012 Liberty Pumps Inc. All rights reserved 8
Risk of electric shock. Always disconnect the pump from the power source before handling or making
adjustments.
Problem Cause Correction
Pump will not run.
 Blown fuse or other interruption of
power; improper voltage.
 Check that the unit is securely plugged in.
Have an electrician check all wiring for proper
connections and adequate voltage and
capacity.
 Switch is unable to move to the
“turn on” position due to
interference with the side of basin
or other obstruction  Position the pump or switch so that it has
adequate clearance for free operation.
 Insufficient liquid level.
 Make sure the liquid level is allowed to rise
enough to activate switch(s).
 Defective switch.  Remove and replace switch.
Pump will not turn
off.
 Switch(s) unable to move to the
“turn off” position due to
interference with the side of basin
or other obstacle.
 Position the pump or switch so that it has
adequate clearance for free operation.
 Defective switch.  Remove and replace switch.
Pump runs or hums,
but does not pump.
 Discharge is blocked or restricted.
 Check the discharge line for foreign material,
including ice if the discharge line passes
through or into cold areas.
 Check valve is stuck closed or
installed backwards.  Remove check valve(s) and examine for
freedom of operation and proper installation.
 Gate or ball valve is closed.  Open gate or ball valve.
 Total lift is beyond pump's
capability.
 Try to route piping to a lower level. If not
possible, a larger pump may be required.
Consult the factory.
 Pump impeller is jammed or volute
casing is plugged.


Remove the pump from the basin. Detach the
pump base and clean the area around the
impeller. Reassemble and reinstall.
Pump runs
periodically when
fixtures are not in
use.
 Check valve was not installed, is
stuck open or is leaking.  Remove check valve(s) and examine for
freedom of operation and proper installation.
 Fixtures are leaking.
 Repair fixtures as required to eliminate leakage.
Pump operates
noisily.
 Foreign objects in the impeller
cavity.


Remove the pump from the basin. Detach the
pump base and clean the area around the
impeller. Reassemble and reinstall.
 Broken impeller.
 Consult the factory for information regarding
replacement of impeller.
 Worn bearings.
 Return pump to the factory or authorized repair
station for repair.
 Piping attachments to building are
too rigid.
 Replace a portion of the discharge line with
rubber hose or connector.
5. Maintenance and Troubleshooting