3
Problem
Possible Cause
Service instructions
TroubleShooTinG GuiDe (cont’d)
13. Toilet flushes in both ADD
WATER and FLUSH position.
14. Water leaks from toilet onto
floor.
15. Green OKAY TO FLUSH light
does not illuminate (for toilet
system supplied with SeaLand
vacuum status panel).
16. Red DO NOT FLUSH light
does not illuminate (for toilet
system supplied with
SeaLand vacuum status
panel).
17. Flush ball opens and closes,
but waste does not leave
bowl (no vacuum).
a. Defective diode D1 between
terminal block pins 1 and 2.
a. Loose water line connection.
b. Defective water valve.
c. Toilet bowl seal is defective.
d. Mounting bolts holding base to
toilet need tightened to 20-25
in.-lbs.
a. Loose wire(s) at terminal block.
b. Loose wire at Flush Switch.
c. Loose or defective wire between
vacuum switch and toilet.
d. Defective green light.
a. Loose wire(s) at terminal block.
b. Loose wire at Flush Switch.
c. Loose or defective wire between
vacuum switch and toilet.
d. Loose or defective wire between
tank FULL relay and toilet
terminal block pin 8.
e. Defective red light.
a. No electrical power to vacuum
pump.
b. Tank FULL shut-down relay
prevents vacuum pump from
operating.
c. Blockage inside bottom of toilet
base.
a. Replace diode.
a. Tighten water line connections.
b. Replace water valve.
c. Replace bowl seal. See instruc
-
tions on page 15.
d. DO NOT OVERTIGHTEN or
damage to toilet may occur.
a. Check wires at pins 3 or 6.
b. Check green wire at Flush
Switch.
c. Repair or replace wires.
d. Replace status panel.
a. Check wires at pins 5, 7 and 8.
b. Check red wire at Flush Switch.
c. Repair or replace wires.
d. Replace water valve.
e. Replace status panel.
a. Check power wires, fuse or
circuit breaker to vacuum pump.
b. Pump out holding tank.
c. See instructions below to clear
blockage.
cleaRing blockage in toilet base
1. Turn off water to the toilet.
2. Open the flush ball by initiating a flush cycle and immediately turning off power to toilet to
prevent the flush ball from closing.
3. Pull the foreign material from the 1-inch diameter orifice at the bottom of the base or, using a
small diameter blunt rod, attempt to push the blockage through the orifice.
locating potential VacuuM leaks in toilet base
The vacuum toilet is part of a vacuum system that includes a vacuum pump and vacuum tank, or
a vacuum generator and vacuum discharge plumbing lines. If a vacuum leak is suspected, special
equipment will isolate the source of the leak. If the toilet is determined to be the source of the leak,
there are three possible areas to investigate:
1. Flush ball and flush ball seal. See Problem 12 in Troubleshooting Guide.
2. O-rings on the rotor shaft.
3. O-rings around bottom of toilet base assembly.
Sources 1 and 2 will require the base assembly to be removed from the toilet and partially
disassembled.
