5755000K
Copyright © Liberty Pumps, Inc. 2020 All rights reserved.
13 | EN
Accidental contact with electrically live parts, items, fluid, or
water can cause serious injury or death.
Always disconnect pump (macerator) from power source
before handling or making any adjustments. Fatal electrical
shock could occur.
RISK OF ELECTRIC SHOCK
Table 2. Troubleshooting Matrix
Problem
Possible Cause
Corrective Action
Water is entering the macerator holding tank slowly
Toilet flushes normally but
evacuates or drains from the bowl
slowly.
• Macerator sounds normal and
runs for 4 seconds, then after
some time runs for 4 seconds.
• No alarm.
The toilet or discharge extension might be
blocked.
The piping must be cleaned.
Poor vent.
Unit must be vented properly to open air to allow
water to enter the macerator tank. Confirm vent is
clear.
Do not use a quick vent.
Accumulation in the strainer basket.
Repetitively flush clean water and allow the
macerator to clear debris. If unit is unable to
self-clear the blockage, the access cover should
be removed for manual cleaning. See Access
Water is unable to enter the macerator holding tank
Toilet flushes normally but does not
evacuate or drain from the bowl.
• Macerator sounds normal and
runs for 4 seconds then remains
off.
• No alarm.
The toilet discharge or extension pipe may
be blocked.
The piping must be cleaned.
Unit not vented correctly.
Unit must be vented properly to open air to allow
water to enter the macerator tank. Confirm vent is
clear.
Do not use a quick vent.
The macerator is jammed
Toilet Flushes normally but
macerator does not turn on or just
hums.
• Green LED is on steady.
The cutter or impeller are jammed
preventing the motor from turning.
Clear the cutter or impeller of blockage.
Internal motor problem.
The pump cartridge must be replaced.
The macerator is unable to evacuate its holding tank and is cycling on thermal overload
Toilet flushes normally but does not
evacuate or drain from the bowl.
• Macerator starts to run and
sounds normal (running) then
stops after 5-10 min. Restarts
after 30 to 60 min.
• Alarm is activated.
Damaged impeller.
Replace impeller. See Impeller Access on
Check valve stuck closed.
Confirm the check valve is functioning properly; if
not, repair or replace. See Check Valve on
Internal hose damaged or disconnected.
Confirm the internal hose is functioning properly;
if not, replace. See Control Switch on page 12.
If the macerator was installed with a ball
valve in the discharge line, valve may be
closed.
Open ball valve.
Air lock.
The volute has a passageway to allow trapped air
to escape. This passageway must be cleaned of
obstruction. See Accessibility to Motorized
Volute inlet plugged.
Clean volute inlet, located on the bottom of the
pump cartridge. See Accessibility to Motorized
