I'm having a problem when I try adding and keeping water in the bowl prior to use. When I press the foot pedal part way no water enters the bowl until the point where the seal opens and the toilet flushes. At that point the water pressure is full and steady. I have about an inch or 2 of free play before the flush but no water enters the bowl until I reach the flush point.
Thetford says a bad water valve so I installed a new valve but still have the exact same problem.