Product Manual

7212000F Copyright © Liberty Pumps, Inc. 2018 All rights reserved. – 7 –
Table 1. Troubleshooting Matrix
Problem Possible Cause Correction
Pump will not turn on or shut
off.
Tripped circuit breaker, tripped GFCI, blown
fuse, or other interruption of power.
Reset tripped circuit breaker, reset GFCI, replace
blown fuse with properly sized fuse, check that the
unit is securely plugged in, investigate power
interruption.
Improper voltage.
Have an electrician check all wiring for proper
connections and adequate capacity.
Plugged vent, or quick-vent in use.
Verify that an unrestricted vent at least 1-¼” in
diameter is in use. Quick-vents shall not be used.
Defective float 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 head (lift height) has been reached (refer
to Figure 8)
Try routing pipe to a lower level. If not possible,
another pumping station may be required at a level
of roughly half the total head (lift).
Pump impeller is jammed.
*Disassemble unit to expose pump impeller.
Remove foreign material. Reassemble.
Trap or inlet piping is clogged. Check the trap and inlet piping for restrictions.
Pump short-cycles.
Plugged vent, or quick-vent in use.
Verify that an unrestricted vent at least 1-¼” in
diameter is in use. Quick-vents shall not be used.
Defective 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.
Check valve was not installed, is stuck open, or
is leaking.
Remove and examine for freedom of operation and
proper installation.
Pump runs periodically when
fixtures are not in use.
Check valve was not installed, is stuck open, or
is leaking.
Remove and examine for freedom of operation and
proper installation.
Faucets are dripping. Repair faucets to eliminate dripping.
Water or soap suds come out
of vent pipe.
Vent pipe is too short or too small in diameter.
Verify that an unrestricted vent at least 1-¼” in
diameter is in use.
Defective float switch.
*Remove tank cover and check that float is free to
move. If build-up restricts float, clean and reinstall. If
defective, replace switch.
Rate of inflow exceeds pump output. Use valve on the inlet to reduce rate of inflow.
Pump operates noisily.
Foreign objects in impeller cavity.
*Disassemble unit to expose pump impeller.
Remove foreign material. Reassemble.
Piping to house structure is too rigid.
Replace a portion of the discharge pipe with rubber
hose to absorb noise.
*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.