©Copyright 2014 Liberty Pumps Inc. All rights reserved 11
6.
Cause
Correction
P
ump will not
turn on
Tripped circuit breaker
or other interruption of
power; improper
voltage.
Have an electrician verify that the pump is wired
according to the installation instructions. Also check all
wiring for proper connections and adequate capacity.
Problem with control
panel
Have an electrician verify that pump is connected to the
control panel correctly. If no problem is found, consult
Liberty Pumps or control panel manufacturer.
Defective float switch
Verify the pump runs manually, without floats. If the pump
works, check that all floats are free to move. If a float has
debris build-up or is restricted by its surroundings, clean
and reinstall float properly. Otherwise consult Liberty
Pumps.
Motor thermal overload
device has tripped
(single phase device
only)
Disconnect the pump from its power source. Using a
multi-meter, verify that there is no continuity between the
hot and neutral motor leads. Once the pump cools, there
will be continuity, and the pump is safe to run. Otherwise
consult Liberty Pumps.
Pump runs or
hums but does
not pump
Discharge is blocked or
restricted
Check the discharge line for blockage or for ice if the line
passes through or into cold areas.
Check valve is stuck
closed or installed
incorrectly
If check valve is present, remove and inspect for freedom
of operation and proper installation.
Pump is air-locked
Remove the pump and inspect the anti-airlock hole.
Remove any debris or rust that may be blocking the hole.
Verify that the pump turn off level has not changed from
its factory specified setting.
Pump impeller is
jammed
With the pump de-energized, inspect bottom of pump for
foreign material blocking impeller. If no blockage is found,
try rotating the impeller by hand. If the impeller will not
rotate, consult Liberty Pumps for further instruction.
Max. lift height (Head)
has been exceeded
(see Fig. E)
Attempt to re-route piping to a lower elevation. If this is
not possible, a larger pump may need to be installed.
Pump does not
turn off
Defective float or build-
up on surroundings is
restricting free
movement of the float.
Check that the float is free to move. If build-up restricts
float, clean and reinstall. Otherwise, consult Liberty
Pumps.
Control panel failure
Have an electrician inspect/evaluate control panel.
Consult control panel manufacturer for further assistance.
Water is
present inside
motor housing
Pump seals have been
compromised
Consult Liberty Pumps.
Low pumping
performance
Impeller wear
Consult Liberty Pumps for additional troubleshooting and
replacement parts.
Pump is rotating in
reverse.
THREE PHASE PUMPS:
Place pump on ground and
inspect rotation while pump is operating. If rotation is
reversed, have an electrician interchange two of the
power leads in the control panel.
SINGLE PHASE PUMPS:
Contact Liberty Pumps
immediately. Do not switch power leads or continue to
operate the pump.
5.
Operation
Troubleshooting