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Old 07-13-2016, 12:55 PM   #1
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Unhappy What is that smell????

Hi All! I have a horrible problem that I am hoping some of you may have a solution for.

I have a 2015 Cardinal 3875 which has 2 black and 2 gray tanks. When I run the main bathroom ceiling fan without a window open, which doesn't happen alot, a horrible smell enters the bedroom. I have flushed all of the tanks and freshened them with the regular blue treatment just to see if it is sewer but I still only get the foul smell. I have made certain that the washer/dryer waste pipe is closed and that all traps have water in them but it does not help. The weird thing is that the smell seems to be coming from the bedroom where there is no plumbing. I have stuck my nose over the heat registers and can smell nothing. When I open the bedroom window the smell eventually goes away.

Any Ideas?

Also, I can not seem to find the drain for the fresh water tank...what/where should I be looking?

Any help would be appreciated...I love troubleshooting!!!
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Old 07-13-2016, 01:17 PM   #2
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Do you leave the black/gray drain valves open when in use?

Turn the fan off before flushing.
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Old 07-13-2016, 01:22 PM   #3
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Do you leave the black/gray drain valves open when in use?

Turn the fan off before flushing.
The black tank drains are always closed and the Gray are usually open but this does not seem to have anyb effect on the smell. The toilet has water in it and the smell does not come from flushing. The smell is present when running the fan with no windows open in the bedroom. It is coming from the bedroom or atleast that is where the smell is strongest.
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Old 07-13-2016, 01:34 PM   #4
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You are probably pulling air through the plumbing vents under your sink. If you run the fan there should be a intake provided somewhere for it to pull the air out. Open the windows or another roof vent when running the fan. We have a horrible smell from the kitchen faucet pullout rubber hose if I do not get all the water out when not in use. It stinks up the whole TT.
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Old 07-13-2016, 01:45 PM   #5
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You are probably pulling air through the plumbing vents under your sink. If you run the fan there should be a intake provided somewhere for it to pull the air out. Open the windows or another roof vent when running the fan. We have a horrible smell from the kitchen faucet pullout rubber hose if I do not get all the water out when not in use. It stinks up the whole TT.
It makes sense doesn't it...? I guess I just figured that if there is water in all the traps there is no way to get gas from the pipes. I never had this issue with my previous travel trailer and I assume that the plumbing system is inherently the same. I will look closer at this. Thanks!
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Old 07-13-2016, 01:51 PM   #6
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My bath fan is only a few feet from the tank vents. If the wind is blowing across the TT in the direction of the vent and fan and my grey valve is open, I get the smell from the sewer. Closing all valves solves the problem. Hope that idea helps.
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Old 07-13-2016, 01:57 PM   #7
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When my black tank smells bad........it is most prevalent in the basement (under bedroom), and in storage areas under the trailer.
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Old 07-13-2016, 03:33 PM   #8
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When my black tank smells bad........it is most prevalent in the basement (under bedroom), and in storage areas under the trailer.
Why do you figure it is that way? Is plumbing just not sealed well?
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Old 07-13-2016, 03:42 PM   #9
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It makes sense doesn't it...? I guess I just figured that if there is water in all the traps there is no way to get gas from the pipes. I never had this issue with my previous travel trailer and I assume that the plumbing system is inherently the same. I will look closer at this. Thanks!
Some units do not have your typical P trap under the sink.
They have a mechanical 'flapper valve' trap that is supposed to close unless water is draining against it. Often times it doesn't completely close and the ceiling fan draws odors into the unit through the sink/shower/washer drain plumbing.

A quick easy way to tell if this might be the culprit, simply keep closed the grey tank drain valves (that you said you typically leave open) and see if the condition still exists.
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Old 07-13-2016, 03:45 PM   #10
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Why do you figure it is that way? Is plumbing just not sealed well?
I don't know. It surprised me. We did Geo Method and it stunk to high heaven. Did something wrong.......others that use it have no smell.

Not sure. Wish I knew........
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