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Are you plugged into shore power? The most common problem with these is low incoming DC voltage. How long has it been since you had the batteries load tested and serviced? That may be part of the problem. Get back to me with this information and I can direct you further.
And please let me know if you are using the coach water supply and pump or an external water source.
Do you have the operator's manual for this? And do you have a small digital multimeter for some testing? About $20 or so at most hardware stores.
O.K........contact me when you get home and I can direct you in some testing.
You are welcome........
Check out the attached link and be sure that this is the toilet we are talking about. http://www.laurelhurstdistributors.com/parts/toilets/sealand_3200.html