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TROUBLESHOOTING GUIDE
Problem Possible Cause Service Instructions
9. Vacuum pump will not run.
10. Vacuum pump will not
shut off.
11. Vacuum pump running too
slow, overheating, or
tripping circuit breaker.
12. Vacuum pump emits odor.
13. Blockage between toilet
and vacuum generator or
vacuum tank.
a. No electrical power.
b. “Tank full” float switch is stuck
c. Loose or broken electrical wiring.
d. Faulty vacuum switch.
e. Faulty motor.
a. Excessive vacuum leak.
b. Faulty vacuum switch.
c. Duckbill valves in vacuum pump
are defective.
d. Vacuum pump or vacuum
generator needs primed.
e. Improper wiring.
a. Low voltage.
b. Loose or corroded wiring.
c. Wire size is too small.
d. Discharge line is blocked
between vacuum pump and
holding tank, causing high back
pressure.
e. Plugged or defective duckbill valve
in vacuum pump.
f. Plugged holding tank vent line.
g. Pump motor worn or defective.
h. Pump bellows clogged with
tissue.
a. Loose or defective hose
connections on pump.
b. Torn or punctured pump
bellows.
a. Collapsed vacuum line.
b. Too many elbows or bends in
vacuum line.
c. Improper operation of toilet.
d. Flushing foreign objects down
toilet.
a. Check input power, circuit
breaker.
b. Remove switch and clean or
replace.
c. Tighten or reconnect wires at
vacuum pump, vacuum generator,
vacuum tank, status panel, “tank
full” float switch relay.
d. Replace vacuum switch.
e. Replace motor.
a. See problem 7.
b. Replace vacuum switch.
c. Replace duckbill valves.
d. Prime pump by charging system
with water.
e. Check wiring. Refer to wiring
diagram.
a. Check for low voltage.
b. Tighten loose connections,
replace corroded wiring.
c. Replace with proper size wire.
d. Disassemble and clean
discharge line.
e. Disassemble pump and clean or
replace duckbill valves.
f. Disassemble and clean vent line.
g. Check motor and replace if
necessary.
h. Remove and clean. Use more
water during flushing.
a. Tighten connections.
b. Replace pump bellows.
a. Inspect vacuum line for collapsed
condition and replace line.
b. Reconfigure vacuum line to
reduce number of elbows.
c. Make sure toilet is being
operated correctly.
d. DO NOT flush any non-
dissolving items (i.e. sanitary
napkins, facial tissue, wet
strength tissue, paper towels,
etc.) or excessive toilet tissue
down toilet. Rapid-dissolving
SeaLand
®
toilet tissue is best.