I have a new to me 2011 Dutch Star after trading in my new Tiffin 36la gasser whose engine blew up! Tiffin wouldn't help.
The DSDP has a tecma silence plus toilet with the two flush button.
During the last few weeks that we have had it flushing the toilet, on 4 occasions, has produced a shot of water out the black vent pipe.....mostly clear but smelly. The toilet bowl was empty until I flushed it again.Did not refill on its own.
Grey tank was open, black tank about half full, vent pipe was clear ( put hose down it and water came into black tank).
Called Thetford and they said to keep gray tank closed unless dumping or using washer.
Called Newmar and they told me the same thing!
Says some pressure is being created???
So....what do you all think??