Liberty Pumps 250-Serie Manual De Instalación página 9

6. 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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