I own a 2007 Monaco Knight 40DFT with two Tecma macerating toilets. One, midship always works fine, the second in back works intermittently. I've done my share of research on this site and anywhere else I could muster and the conclusion or assumption if you will from said research is the controller being the problem. More specifically heat affecting the controller. The back bath in my coach is right above the engine, transmission and radiator of course and there is a fairly large skylight above the shower. This back bath was always hotter than the rest of the coach which i've now helped quite a bit by putting a piece of reflective foam blocking the skylight. In my research i've found other peeps with very similar issues and they also attributed it to heat with one even saying they had contacted Thetford technicians and they admitted to a .known issue with heat and the controllers and no fix available. These controllers are available on Amazon as Thetford Controller 36398 at $256.39 but the technician said buying one might result with the same problems and I could not see buying something for that price and may or may not fix the problem and for how long. So, I thought long and hard about how I could cool this controller which is stuck to the inside back cavity of the toilet with sticky tape. Let me now get to my fix. I bought two heatsinks that you might find on a computer processor chip and a thermostat all being 12v power. I connected thermostat to 12v constant power and the heatsinks to the thermostat. The reason for this is I did not want something running constantly or off constantly, I wanted it controlled. Now the trick is to find that temperature when the controller quits working and it just has yet to get hot enough round these parts to get a failed situation. I've been checking the temp on the back of the controller with a laser temp gauge and have seen up to 81 degrees so far and everything seems to work still without trying to cool it. Now maybe just the fact that it is not now stuck up inside the cavity in back has kept it cooler? I don't know but I'm waiting for some real heat to see if I can catch that temp when it does fail. Remember this is an assumption on my part as to why this is an intermittent problem and we all know what we say about assumptions...
Parts list: Heatsinks=$15.99
https://www.amazon.com/dp/B07N67RGRY...roduct_details
Thermostat=$8.99
https://www.amazon.com/dp/B07H2ZDDF1...t_details&th=1
As you can see from the pictures, it's a mess still but once verified it will work as I hope I will clean it all up nice and tidy. Also I do not think I have to explain how I hooked up all up as I "assume" you have some knowledge of basic 12v wiring and the functions of a thermostat. Hope this helps someone and will update as I find anything else out.
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