Troubleshooting - Dometic 3000 Owner's Manual

TROUBLESHOOTING

A volt/ohmmeter (VOM) and the appropriate Toilet Wiring Diagram may be required for this section.
Caution: Portions of this section will require that power be applied to the toilet. Keep hands away from
the flush ball, motor drive arm and rotor shaft to prevent personal injury during testing and troubleshooting.
The control module uses a microprocessor to provide all the automatic and timing functions. The control module
is on the right side under the access cover on the top of the toilet. The control module has input and output status
lights that can be used in troubleshooting the toilet.
The program in the microprocessor monitors the input and output signals during a normal flush cycle. If the inputs
or outputs do not follow the commands of the program, then the microprocessor may go into a "standby" mode and
flash an "error code." The microprocessor is reset by placing the Mode switch in the SERVICE position temporarily,
then returning the switch to the NORMAL position.
A safety circuit in the control module monitors flush ball operation. If foreign objects or low voltage prevent the flush
ball from closing, this circuit prevents personal injury or damage to the flush valve motor. If this condition occurs,
reset the control module by placing the Mode switch into the SERVICE position temporarily, then returning it to the
NORMAL position.
Status Light
1 Low Level
2 High Level
3 Valve Closed
4 Valve Open
5 Service Mode
6 Flush
7 Add Water
8 High Vac Switch
9 Holding Tank Full
10 OK to Flush
11 Do Not Flush
12 Water Valve
13 +5V
ERROR CODES
Status Light No. of Flashes
10 OK to Flush
11 Do Not Flush
11 Do Not Flush
11 Do Not Flush
11 Do Not Flush
Function
Water Level Switch in "Low" position.
Water Level Switch in "High" position.
Flush valve Closed Limit Switch engaged.
Flush valve Open Limit Switch engaged.
Mode Switch in "Service" position.
Flush Switch on control panel engaged.
Add Water Switch on control panel engaged.
High vacuum in system (allows toilet to flush).
Full holding tank (prevents toilet from flushing).
Signal to "OK TO FLUSH" light on control panel.
Signal to "DO NOT FLUSH" light on control panel.
Electric water valve energized.
Input power present.
Pause
1 .5 sec.
1 2 sec.
2 2 sec.
3 2 sec.
4 2 sec.
CONTROL MODULE STATUS LIGHTS
Condition
Mode Switch in SERVICE position
VALVE OPEN Limit Switch problem
VALVE CLOSED Limit Switch problem
Insufficient vacuum in system
Flush valve motor relay failure
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