Dometic VacuFlush 5000 Series Operation Manual page 13

VacuFlush Pedal-Flush Toilet
Problem
13 . Vacuum pump is running too
slow, overheating, blowing fuses
or circuit breaker .
14 . Toilet will not flush .
(No vacuum .)
See problem 15
if necessary .
15 . Blockage between toilet and
vacuum generator .
16 . Pump emits odor .
Possible Cause
a . Gear motor is worn, defective .
b . Plugged vent line or vent filter .
c . Blockage in discharge line .
d . Improper wire size .
e . Improper voltage .
f . Vacuum pump bellows clogged
with tissue .
a . Blockage exists in system .
b . Pump will not run .
c . Duckbill valves in vacuum pump
are inverted due to blocked
discharge line or an attempt
to pump out against closed
seacock .
a . Collapsed vacuum line .
b . Sharp bends or kinks in vacuum
hose .
c . Improper operation of toilet .
d . Foreign objects were flushed
down toilet .
a . Loose or defective hose
connection on pump .
b . Loose intake or discharge
fittings on pump .
c . Worn, torn or punctured pump
bellows (vacuum generator) or
diaphragm (vacuum holding
tank) .
Maintenance/Winterizing/Service
Service Instruction
a . Check motor; replace if needed .
b . Disassemble and clean out vent
line . Replace vent filter if
necessary .
c . Disassemble and clean
discharge line . Be certain that in-
line valves (duckbill valves) and
seacock are in proper position .
d . Wire size too small . Check
electrical diagram for proper wire
size for voltage of pump .
e . Check input power for low
voltage .
f . Remove and clean bellows
assembly . (When flushing toilet,
using more water may alleviate
this problem .)
a . Open flush ball, check 1-inch
(25 mm) orifice at bottom of
base for blockage and dislodge
it . If blockage is not in base, it
may be found in:
• outlet of vacuum tank
• inlet of vacuum generator
• diptube of vacuum generator
• inlet of vacuum pump
b . See problem 12 .
c . Replace duckbill valves, making
sure they point in the correct
direction .
a . Inspect vacuum line for
collapsed condition . Replace if
needed .
b . Inspect vacuum hose for kinks
or bends . If less than 8 .5 inches
(216 mm) radius on any bend,
reposition hose to achieve mini-
mum 8 .5-inch bend radius .
c . Make sure each person using
toilet knows correct procedure .
d . DO NOT flush non-dissolving
items (i .e . sanitary napkins,
facial tissue, wet strength tissue,
paper towels, etc .) or excessive
toilet tissue down toilet . Dometic
brand toilet tissue is best .
a . Tighten connections or
replace hose and make new
connections .
b . Tighten intake or discharge
fittings on pump . Replace
nipples or adapters if necessary .
c . Replace pump bellows or
diaphragm .
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