Community Forums

mllk3rd · 02-08-2023, 12:35 PM

I have a 2020 Newmar Baystar 3609 with a Dometic 7640 macerator toilet, it worked before I put it away for winter, now I'm planning on using it and the toilet won't flush, the red light under the back side of the toilet is flashing so I disconnected the yellow wire that is the tank sensor wire and nothing changed, still won't flush and the red light is still flashing. When I turn off the 12v power and turn it back on I can hear the toilet spin up so it does work. Any suggestions?? TIA

YC1 · 02-08-2023, 12:53 PM

If it is a two button device, press both at the same time and hold them for several seconds. Mine has an emergency bypass function but this can only be done a few times.

Your tank may need a proper cleaning or dumping if your forgot to.

I had to move my in tank spray head over the top of the edge where the sensors are mounted to get a constant good reading an no false full lights.

mllk3rd · 02-08-2023, 01:42 PM

Out toilet doesn't have a controller with buttons, it is operated only by a foot pedal. By disconnecting the yellow tank sensor wire it bypasses the tank sensor, so the tank sensor is not the issue. Just got off of the phone with Dometic, they stated that I need to check for power going into the controller, that is under the back side of the toilet, and power coming out of the controller to the motor while the foot pedal is depressed, if there is power going into the controller but no power coming out of the controller then the control board is bad. So now to check that out.

mllk3rd · 02-08-2023, 02:27 PM

So I did the trouble shooting and it looks like it's the control board, no one around has one and they are currently on back order 8 to 12 weeks. So I ordered a new one from a vendor on ebay, I'll follow up once I get it installed