Liberty Pumps 251-3 Manuel D'installation page 10

7. Troubleshooting
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.
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(s) unable to move to the
"turn off" position due to
interference with the side of basin
or other obstacle.

Defective switch.

Discharge is blocked or restricted.

Check valve is stuck closed or installed
backwards.

Gate or ball valve is closed.

Total lift 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.
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Correction

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.

Make sure the liquid level is allowed to rise
enough to activate switch(s).

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(s) 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 the factory.

*Remove the pump from the basin. Detach
the pump base and clean the area around
the impeller. Reassemble and reinstall.

Remove check valve(s) and examine for freedom
of operation and proper installation.

Repair fixtures as required to eliminate
leakage.

*Remove the pump from the basin. Detach
the pump base and clean the area around
the impeller. Reassemble and reinstall.

Consult the factory for information regarding
replacement of impeller.

Return pump to the factory or authorized
repair station for repair.

Replace a portion of the discharge line with
rubber hose or connector.
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