10 | EN
Copyright © Liberty Pumps, Inc. 2021 All rights reserved.
5647000M
Pump does not start.
Loose wiring connections.
Check and tighten all connections.
Thermal overload tripped.
Wait for pump to cool to operating temperature.
Water inside motor.
Check/replace oil, oil plug, and sealing washer as needed.
Damaged lower lip seal or mechanical seal. Replace seal.
Replace oil as needed.
Damaged O-ring between oil chamber and motor plate.
Return to authorized repair facility for O-ring and oil
replacement.
Damaged cord. Replace as needed.
Pump does not start
and overload heaters
trip.
Unintentional ground.
Turn off power and check motor leads for possible
ground.
3-phase motor winding failure.
Check resistance of motor windings. All three phases
should have the same reading.
Obstructed impeller or volute.
Remove obstruction.
Pump operates with
control panel selector
switch in Hand position
but does not operate in
Auto position.
Control circuits malfunctioning.
Check float level control or the alternator relay for issues.
Check control panel.
Pump runs but does not
turn off.
Pump is airlocked.
Turn pump off and let set for several minutes, then
restart.
Control panel selector switch in Hand position.
Set selector switch to Auto position.
Float switch unable to move to the 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.
Control panel failure.
Check control panel.
Defective float switch.
Replace float switch.
Missing or faulty curb stop/swing check valve
allowing system pressure to feed back through
discharge piping.
Verify presence of a curb stop check valve or replace curb
stop/swing check valve assembly.
Pump does not deliver
proper capacity.
Discharge valve(s) 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.
Incorrect motor rotation.
1-phase internal capacitor models: contact factory.
1-phase exterior capacitor models: verify capacitor wiring
in Figure 1, else consult factory.
3-phase: Correct 3-phase pump rotation direction. Refer
to section
3-Phase Pump Rotation Verification
.
Total head is 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.
Table 3. Troubleshooting Matrix (continued)
Problem
Possible Cause
Corrective Action
