The toilet in my Newell is not operating properly. I have replaced air/water cycle valve, but still have to plung toilet after using toilet paper. The timer has been adjusted anywhere from 3-7 seconds. This does not correct the problem.
From your comments, it appears your coach is equipped with a Microphor RV toilet. However, we do not have enough information to speculate on a diagnosis. We suggest that you call the Microphor customer support department at 1-800-358-8280, ext. 122 and describe your situation in more detail. Microphor provides very good direct customer support.