Maintenance And Troubleshooting - Liberty Pumps Pro370 Serie Manual De Instalación

Maintenance and Troubleshooting

WARNING RISK OF ELECTRIC SHOCK
 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.
Problem
Pump will not run.
Pump will not turn off.
Pump runs or hums, but
does not pump.
Pump runs periodically
when fixtures are not in use.
Pump operates noisily.
NOTE: Liberty Pumps, Inc. assumes no responsibility for damage or injury due to disassembly in the field. Disassembly, other than at
Liberty Pumps or its authorized service centers, automatically voids warranty.
7225000I
Table 2. Troubleshooting Matrix
Possible Cause
Blown fuse or other interruption of power;
improper voltage.
Switch is unable to move to the "turn on" position
due to interference with the side of basin or other
obstruction.
Insufficient liquid level.
Defective switch.
Switch unable to move to the "turn off" position
due to interference with the side of basin or other
obstruction.
Defective switch.
Discharge is blocked or restricted.
Check valve is stuck closed or installed backwards.
Gate or ball valve is closed.
Total head (lift height) is beyond pump's capability.
Pump impeller is jammed or volute casing is
plugged.
Check valve was not installed, is stuck open, or is
leaking.
Fixtures are leaking.
Foreign objects in the impeller cavity.
Broken impeller.
Worn bearings.
Piping attachments to building are too rigid.
Copyright © Liberty Pumps, Inc. 2018 All rights reserved.
Corrective Action
Check that the unit is securely plugged in. Have an
electrician check all wiring for proper connections
and adequate voltage and capacity.
Position the pump or switch so that it has adequate
clearance for free operation.
Verify the liquid level is allowed to rise enough to
activate switch(es).
Remove and replace switch.
Position the pump or switch so that it has adequate
clearance for free operation.
Remove and replace switch.
Check the discharge line for foreign material,
including ice if the discharge line passes through or
into cold areas.
Remove check valve and examine for freedom of
operation and proper installation.
Open gate or ball valve.
Try to route piping to a lower level. If not possible,
a larger pump may be required. Consult Liberty
Pumps.
Remove the pump from the basin. Remove cutter
and cutter plate. Clean the area around the
impeller. Reassemble and reinstall. The center
screw uses a 6 mm hex drive. The screw can be
heated to remove thread locking compound.
Remove check valve and examine for freedom of
operation and proper installation.
Repair fixtures as required to eliminate leakage.
Remove the pump from the basin. Remove cutter
and cutter plate. Clean the area around the
impeller. Reassemble and reinstall. The center
screw uses a 6 mm hex drive. The screw can be
heated to remove thread locking compound.
Consult Liberty Pumps for information regarding
replacement of impeller.
Return pump to Liberty Pumps or authorized repair
station for repair.
Replace a portion of the discharge line with rubber
hose or connector.
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