Problem cause correction – Liberty Pumps 405HV User Manual

Page 4

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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

Cause

Correction

Pump will not turn

on or shut off.



Blown fuse or other interruption of

power; improper voltage.



Check that the unit is securely plugged in.

Have an electrician check all wiring for proper

connections and adequate capacity.



Plugged vent, or quick-vent in use.



Be sure that an unrestricted vent at least 1-¼”

in diameter is in use. Quick-vents shall not be

used.



Defective switch or build-up on tank

wall restricting free movement of

float switch.



*Remove access cover and check that float is

free to move. If build-up restricts float, clean

and reinstall. If defective, replace switch.

Pump runs or hums

but does not pump.



Discharge is blocked or restricted.



Check the discharge line for blockage,

including ice if the line passes through or into

cold areas.



Check valve is stuck closed or

installed wrong.



Remove and examine for freedom of

operation and proper installation.



Total lift height has been reached

(see Fig. 2)



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.



Pump impeller is jammed.



*Disassemble the receiver and bottom base

of pump. Remove foreign material.

Reassemble.



Trap or inlet piping is clogged.



Check the trap and inlet piping for restrictions.

Pump short-cycles.

