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 actually do have odor. which leads me to believe I have a venting issue. Thanks for any advice and or tips, Steve.UPDATE; Found the issue. Helmsley was right, the leak was into the bottom section that the bowl mounts to. Edited my post to say we had odor when clean and flushed. Called Dometic, talked to a gal that gave me the impression she didn't like to talk to people on the phone and when I asked her how she was her answer was a "let's get this over with" overwhelmed! Long and short of it is my john is 4 years old and it's my problem, even though there is a design change to remedy the problem. I asked it would leak again or if the problem was solved and was told she couldn't answer that question and if some else could, to buy a toilet from them. So I guess I'll do some research on Thetford toilets. Took an hour and a half to get a customer service rep on the phone and when I did I felt like I did something wrong by calling. Not to mention the gal was kind of rude to me. Not sure Dometic is a good choice for any appliances.Expected better I guess.

Is it definitely sewage smell, or could it just be musty or mildew? If your not sure, try dumping only the grey tank when the smell returns to verify the source tank. My kids had friends stay in my "C" overnight and promised not to use the toilet or water because it was winterized, well someone did wash something or use the sinks, I had a bad smell from the grey tank that took a good bleaching and flushing to clear.

On our last TT we had a plastic toilet of unknwn brand and it actually had a little hole under the rim that vented to the underside of the toilet. If the tank was especially smelly and the wind blew just right, it would force some small amount of odors into the cabin.We learned to use toilet chems to keep the funk down.

Check your air admittance valves. Pretty simple and inexpensive but I've heard that they sometimes go bad.

I bought a used TT that smelled. Put water in the bowl etc. It went away when I replaced the toilet. I would guess that it was the seal but you could argue that the toilet may have been damaged. I guess it could be the rubber seal washer under the toilet but as you said be sure the vents and other stuff are ok first.We changed it because we wanted a high profile.

Dometic had a recall on the model 300 toilets that were causing smells, check and see if yours falls under that. You should just be able to call their customer service with the serial number of the toilet and they can tell you. If it is, they will send a shiny new model 310 to replace it.

Smelly bathroom ! | Good Sam Community

punomatic
Explorer
Jul 20, 2017
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.
DutchmenSport
Explorer
Jul 20, 2017
Have you recently cleaned the inside of the neck of the actual toilet? There are small ledges inside the neck where things can get caught. When cleaning the toilet, shove the brush through the hole and clean the neck. Hang on to the brush, you don't want to drop it. Tie a string to the end just in case. I always do that. You'd be surprised if you get a flashlight and look inside that hole how much gunk gets caught in there. Chemicals never reach there. If they do, they just roll right off.
a308hunter
Explorer
Jul 19, 2017
Yupp! Found the problem. Gasket leaked and water went into space between the top and bowl. Helmsey nailed it. Kinda what I thought when the vent was ok. I know what they're made of now!! Could have been worse, it could have leaked on the floor. Going to replace with a china one as soon as I contact Dometic to see if they'll help me out. Thanks for all the replies. Happy Travels, Steve and Denise
700g
Explorer
Jul 19, 2017
Helmsey wrote:
Dometic had a recall on the model 300 toilets that were causing smells, check and see if yours falls under that. You should just be able to call their customer service with the serial number of the toilet and they can tell you. If it is, they will send a shiny new model 310 to replace it.
They were leaking between the bowl and outer wall.....
K-9_HANDLER
Explorer
Jul 19, 2017
I had the floor flange seal that went bad that did that. Have also replaced the ball seal twice but when they go the bowl will usually leak water into the tank slowly.
TurnThePage
Explorer
Jul 19, 2017
JFNM wrote:
Check your air admittance valves. Pretty simple and inexpensive but I've heard that they sometimes go bad.
x2
Helmsey
Explorer
Jul 19, 2017
Dometic had a recall on the model 300 toilets that were causing smells, check and see if yours falls under that. You should just be able to call their customer service with the serial number of the toilet and they can tell you. If it is, they will send a shiny new model 310 to replace it.
azrving
Explorer
Jul 19, 2017
I bought a used TT that smelled. Put water in the bowl etc. It went away when I replaced the toilet. I would guess that it was the seal but you could argue that the toilet may have been damaged. I guess it could be the rubber seal washer under the toilet but as you said be sure the vents and other stuff are ok first.
We changed it because we wanted a high profile.
JFNM
Explorer
Jul 19, 2017
Check your air admittance valves. Pretty simple and inexpensive but I've heard that they sometimes go bad.
ScottG
Nomad
Jul 19, 2017
On our last TT we had a plastic toilet of unknwn brand and it actually had a little hole under the rim that vented to the underside of the toilet.
If the tank was especially smelly and the wind blew just right, it would force some small amount of odors into the cabin.
We learned to use toilet chems to keep the funk down.

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