Originally Posted by Phil57
Boo if I understand correctly the issue is the water drains out of the bowl. It has nothing to do with tank levels. Correct? If so mine does the same and. I have had the board replaced twice and FR replaced the toilet and still the same. No matter what I do the water will not stay in the bowl but to confuse the issue it works correctly sometimes. Nothing but fun.
The fix according to Thetford is to use a wire tie to hold the discharge hose up higher. I haven't done this fix yet but plan to. I'm not sure if the toilet needs to be pulled or if it can be accessed from the carpeted panel on the back.
Before I do it I will call Thetford again to get a better understanding of the fix.
Yes, the water that comes INTO the bowl AFTER a flush will not stay in the bowl, but drains out immediately; making gurgling and belching sounds as the bowl goes totally empty. FUN..... hate it when I have visitors!!!
But only does it when my black tank is full or nearly so. I really think that the black tank being full (or nearly full) is creating a vacuum somehow.
I've dropped a note to Randy to see what FR may know about it. I'll post back when I hear from him.