Dometic 4000 Series - Troubleshooting Common Issues

10
EN
Toilets
5.2 Troubleshooting
Fault Possible cause Suggested remedy
Water does not
enter the bowl and
the toilet does not
flush
Toilet fuse or circuit breaker is
tripped
To check the toilet fuse, turn off
electrical power to toilet, wait 60
seconds, then turn on the power to
the toilet. Check the circuit breaker at
the main distribution panel
Loose wire connections Check for loose or defective wires at
circuit board pins 9 and 10
Incorrect wiring of toilet to
incoming power
Check for reverse polarity of incoming
power
Defective circuit board Replace the circuit board
Water enters toilet
bowl, but toilet
does not flush
“OK to Flush” light is not lit on
status panel
Check for loose/defective wires
between the vacuum switch (on
vacuum generator) and wire 6 of the
circuit board
Electrical failure from flush switch
to toilet
Check for loose/defective wires
between the flush switch and wires 2
and 4 of the circuit board
Flush switch may be defective Replace if necessary
Loose flush ball motor wires Check the wires between motor and
circuit board wires 17 and 18
Defective flush ball motor Replace if necessary
Flush ball motor drive arm failure. See “Replacing the flush ball” on
page 14
Drive linkage failure See “Replacing the drive linkage” on
page 15
Water does not
enter toilet bowl,
but toilet flushes.
Blocked water supply Clear the blockage in the water line or
filter screen at the water valve inlet
Loose/defective wires Check the wires between the water
valve and toilet circuit board wires 15
and 16
Defective water valve Replace the water valve
Defective circuit board Replace the circuit board
Water does not
enter toilet when
pressing “Add
Water” switch.
Electrical failure Check the wires between the “Add
Water” switch and circuit board wires
1 and 4
Defective flush switch Replace the flush switch
Water does not
shut off and toilet
bowl overflows.
Debris inside water valve or
defective water valve
Replace the water valve