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Old 09-12-2020, 08:06 AM   #1
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Spartan Chassis
Join Date: Oct 2017
Posts: 105
DIY Dometic Macerator Toilet Tester

Let me start by saying this is not a tester that will answer all your possible questions when trying to narrow down the exact part that is needed to repair your non-functioning toilet. But for the cost and time to build, it will save you a lot of time and money.

Tests

It will determine if the “Flush Panel” and “Control Module” are working correctly. It won’t isolate the “Flush Panel” as a possible problem (CanBus tester needed) but it will verify everything downstream. This will isolate the problem to the “Flush Panel” or the “Control Module” if everything downstream functions correctly. It will test the water control valve and the macerator pump individually which verifies all the components in the flushing system.

If you have a problem with the tank level sensor telling the “Control Module” the tank is Full and not to flush and you know the tank is not Full, you can still flush the toilet until you get time to fix the problematic tank level sensor. The tester consists of some wire, two pushbutton switches, box for the switches, some gator clips and the Deutsch plug to plug into the toilet.

How to use the tester

To connect the tester to the toilet all you need to do is to reach behind the toilet and unplug the grey four pin plug and plug in your tester. Then connect the tester to 12 VDC and you are done. To use the tester, just push the “Fill” button to start putting more water in the bowl. Continue to hold the “Fill” button until the water reaches the level suitable for a good flush. Continue to hold the “Fill” button as you press the “Flush” button. While holding both buttons, give the pump time to empty the bowl just like it does when everything is working correctly. Once the pump has successfully done it’s job, release the “Flush” button and continue to refill the bowl to the proper level. Now release the “Fill” button and you are done!

If someone has a better test for the same or nearly the same cost, please post your design. I don’t want to take the time to draw a schematic, I think the photos should answer those questions. Good Luck…
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Old 09-12-2020, 10:39 AM   #2
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Spartan Chassis
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Schematic for plug to connect to the toilet.

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Old 01-12-2021, 02:33 PM   #3
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Has anyone made a macerator toilet tester yet? If you need the part number for the four pin plug just let me know.
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