a308hunter wrote:
For some reason my bathroom has a smell this year. Never had a problem before this. Toilet seal holds water just fine. Toilet seems tight to the floor. It's a Dometic 300 plastic toilet. Haven't checked the roof vent yet but will today. Any one have ideas as to what the problem might be and has any one had good luck with vent mods, like the 360 siphon or the torpedo vent. We do have those Asian beetles here and wasps, so it could be something like that. Kind of an embarrassing situation if folks come to visit. Also I have done all the proper steps to keep clean tanks. When empty and flushed I have no odor. which leads me to believe I have a venting issue. Thanks for any advice and or tips, Steve.
I had the same problem. It turned out that there is a square O ring between the plastic bowl and the outer plastic housing. Mine leaked and I found about a cup of black water in between the two moldings.
It is easy to fix. Remove the toilet. Disassemble the two moldings from each other and clean out the black water. Be very careful when you reassemble the unit to make sure you don't roll or twist the square (cross-section) O ring, which was the reason mine was leaking.