5755000K
Copyright © Liberty Pumps, Inc. 2020 All rights reserved.
15 | EN
General plumbing
The macerator pulses for no
apparent reason.
Water leakage from the toilet reservoir.
Check flush valve and related components in the
reservoir tank.
Check valve failure of the macerator.
The discharge flange contains a check valve that
requires cleaning or replacement. See Check
General plumbing
Water backs up into shower tray.
• Alarm is not activated.
Blockage or inadequate slope of pipe.
Clear blockage in piping, or increase pitch of
discharge pipe. Typically ¼” drop per foot is
adequate for a gravity drain.
The inlet flappers of the macerator are not
functioning.
Clear any buildup in the macerator holding tank
that is preventing the flappers from opening. See
Accessibility to Motorized Cartridge on
General plumbing
Macerator is noisy when running.
Rattling piping.
Both the discharge and vent plumbing should be
secured using appropriate pipe clamping.
Foreign object in cutter basket.
The access cover should be removed for manual
cleaning. See Access Cover on page 10.
General plumbing
During the draining of the bathtub,
the alarm sounds and/or water
backs up into the toilet.
The inflow is greater than the macerator
can handle.
A full port ball valve should be installed between
the tub and macerator. Throttle down or partially
close the ball valve until the macerator can handle
the drainage rate from the tub.
System is backing up
Water backs up into shower tray.
• Alarm is activated.
Damaged impeller.
Replace impeller. See Impeller Access on
Volute inlet clogged.
Clean volute inlet. See Accessibility to Motorized
Internal hose damaged.
Confirm the internal hose is functioning properly;
if not, replace. See Control Switch on page 12.
Air lock.
The volute has a passageway to allow trapped air
to escape, this passageway must be cleaned of
obstruction. See Accessibility to Motorized
Incoming flow rate is greater than pump
capacity.
The unit is capable of handling up to two shower
heads—multiple (3 and up) shower heads must
be avoided.
Check valve failure of the macerator.
The discharge flange contains a check valve that
either requires cleaning or replacement. See
Table 2. Troubleshooting Matrix (continued)
Problem
Possible Cause
Corrective Action