Liberty Pumps XFL50 Serie Manuel D'installation page 8

Problem
Pump runs or hums, but does
not pump.
Pump runs periodically when
fixtures are not in use.
Pump operates noisily.
Seal fail light is illuminated.
Cause
Total lift is beyond pump's capability.

Pump impeller is jammed or volute

casing is plugged.

Pump is air locked.
 
Capacitor failure.
 
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.

 Lower seal has been compromised
 Relay sensitivity is incorrect
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Correction
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.
Clear anti-air lock hole.

Add baffle to reduce entrained air bubbles.

Check caps and replace if needed.

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.
 Replace lower seal
 Decrease sensitivity by turning the dial.
Proper range is 75 to 125
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