Specifications

8
Maintenance/winterizing/service Dometic 4300/4400 Series Toilets
5
Troubleshooting information
Wiring diagram
Symptom Possible Cause Service Instruction
1. Toilet will not ush and water will
not enter toilet bowl.
Fuse blown or circuit breaker is
tripped.
• Check toilet fuse or circuit
breaker at DC distribution panel.
• Check for loose/defective wiring
between power source and toilet
terminal block pins 5 and 8.
• Check for reverse polarity of
incoming power.
• Check for defective diode D1 at
pin 5 of terminal block.
2. Water enters toilet bowl, but
toilet will not ush.
Electrical or mechanical failure
related to ush valve.
• Check for loose/defective wiring
between ush switch and toilet
terminal block pins 2 and 3.
• Flush switch may be defective.
Replace if necessary.
• Check for loose ush ball motor
wires at terminal block pins 2
and 8.
• Flush ball motor may be defec-
tive. Replace if necessary.
• Flush motor drive arm failure.
See p. 12 for replacement
instructions.
• Drive linkage failure. See p. 12
for replacement instructions.