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Unfortunately, that is a complex toilet and it can be many things that can go wrong. This format doesn't lend itself well for that kind of diagnosis and I would suggest that you call in a mobile tech that works in your area for some assistance. Be sure they have experience in working with these. I would suggest that if you haven't had the coach batteries serviced and load tested in the recent past that you do that first. This sounds like it might be a low voltage problem and that is usually battery related. Or it might be a charging problem. Those can be ruled out pretty fast. Sorry I can't be of more help here, but I will opt out of this question on the chance another tech might be able to guide you in some testing.
I have to agree with Randall on this, if BOTH toilets are not flushing I would be checking the DC voltage at the back of the toilets, you could have a situation where if the voltage was low you still might have lights inside the RV but since the toilet uses a motor might not be enough voltage to operate them. IT would be very odd for something to fail on each toilet. The one thing they both have in common is the DC voltage so I would be checking.
We try out very best and if you would like a refund I can request one for you, IF you would like to check things out and get back to me that is fine as well. Our goal is for you to be satisfied and want to come back in the future....... Robert
Hi..... Was just checking in to see in my answer helped, if you still have more questions or concerns please feel free to contact me...
Have a Safe and Happy New Year!! Robert