Liberty Pumps 404 Manuel D'installation page 4

∗ NOTE: Liberty Pumps, Inc. assumes no responsibility for damage or injury due to disassembly beyond float removal in the field.
Disassembly, other than at Liberty Pumps or its authorized service centers, automatically voids warranty.
Problem
Pump will not turn
on or shut off.
Pump runs or hums
but does not pump.
Pump short-cycles.
Cause
•
Blown fuse or other interruption of
power; improper voltage.
•
Plugged vent, or quick-vent in use.
•
Defective switch or build-up on tank
wall restricting free movement of
float switch.
•
Discharge is blocked or restricted.
•
Check valve is stuck closed or
installed wrong.
•
Total lift height has been reached
(see Fig. 2)
•
Pump impeller is jammed.
•
Trap or inlet piping is clogged.
•
Plugged vent, or quick-vent in use.
•
Defective switch.
•
Check valve was not installed, is
stuck open, or is leaking.
•
Check that the unit is securely plugged in.
Have an electrician check all wiring for proper
connections and adequate capacity.
•
Be sure that an unrestricted vent at least 1-¼"
in diameter is in use.
•
*Remove access cover and check that float is
free to move. If build-up restricts float, clean
and reinstall. If defective, replace switch.
•
Check the discharge line for blockage,
including ice if the line passes through or into
cold areas.
•
Remove and examine for freedom of
operation and proper installation.
•
Try routing pipe to a lower level. If not
possible, another pumping station may be
required at a level of roughly half the total lift.
•
*Disassemble the receiver and bottom base
of pump. Remove foreign material.
Reassemble.
•
Check the trap and inlet piping for restrictions.
•
Be sure that an unrestricted vent at least 1-¼"
in diameter is in use.
•
*Remove access cover and check that float is
free to move. If build-up restricts float, clean
and reinstall. If defective, replace switch.
•
Remove and examine for freedom of
operation and proper installation.
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Correction