Free 7 Day Trial RV GPS App RV Trip Planner Campground Reviews RV Maintenance Free 7 Day Trial ×


Reply
 
Thread Tools Display Modes
Old 10-13-2021, 11:20 PM   #1
Junior Member
 
Join Date: Feb 2021
Location: New Orleans, La
Posts: 8
Sewer gas smell in bathroom

We have 2021 Dynamax Force and our bathroom smells like sewer gas from time to time. It smells like that with the fan on or off. Thoughts?
The Force is offline   Reply With Quote
Old 10-14-2021, 06:01 AM   #2
Senior Member
 
RickV's Avatar
 
Join Date: Apr 2012
Location: Fort White, Fl
Posts: 657
Look under your sink there is probably a Air Admittance Valve there that has malfunctioned. Easy to replace. I have found over the years it is better to spend the extra $$$ and get a better replacement valve they are available at Lowes, HD
__________________
2021 Alpine 3790FK
2021 F-350 SD XLT PS 6.7 Dually Longbed 4wd Crew Cab
RickV is offline   Reply With Quote
Old 10-14-2021, 06:04 AM   #3
Senior Member
 
Join Date: Nov 2016
Posts: 898
Look at your toilet bowl. Some have a hole 3/4 of theway up in the back of the bowl.

It is there so if the flush valve fails to stop all the water , the bowl will fill and the excess water drains into the black tank.

These system depends on some water entering the overflow hole to form an air block to the tank gas , similar to an under sink U .

Might be worth the experiment to fill the bowl to see if it still smells after some water goes down the overflow drain.,if your toilet bowl is built like this.
FFred is offline   Reply With Quote
Old 10-14-2021, 09:26 AM   #4
Trailer Park Supervisor
 
NJKris's Avatar
 
Join Date: Sep 2018
Location: Northern NJ
Posts: 6,493
I discovered that in temps 85 or hotter, if tank is not dumped every few days, and I don't double the amount of tank treatment (I use TST orange syrup), horrible things can happen with fumes, causing you to run outside while trying not to wretch. You being in NOLA, this would not surprise me. Black tank down there can turn into a horrid crock pot right quick!
__________________
2019 Rockwood Geo Pro G19FD w/off road package
2015 Ford F150 XLT Super Cab 4x4 V8
NJKris is offline   Reply With Quote
Old 10-14-2021, 10:39 AM   #5
Commercial Member
 
Join Date: Nov 2007
Location: Bristol, IN
Posts: 16,441
Quote:
Originally Posted by The Force View Post
We have 2021 Dynamax Force and our bathroom smells like sewer gas from time to time. It smells like that with the fan on or off. Thoughts?
What are you using for tank treatment? (google "geo method")

I also make sure I let go of the toilet flush pretty quickly...it almost needs to "snap shut". Cover those two things and if it continues we can look at other items.
__________________
Please post questions as a "New Thread" (not private message) so that others can benefit from the answers. Use Private Messages for sensitive information only. Owners manuals are available online and via iPhone/Android Apps.https://www.dynamaxcorp.com/OnlineManual.aspx Don't forget to subscribe to our YouTube page for "How To" videos and updates https://www.youtube.com/c/DynamaxRVs/
bclemens is offline   Reply With Quote
Old 10-14-2021, 10:53 AM   #6
Senior Member
 
Join Date: Jul 2017
Location: North of Seattle, WA
Posts: 13,487
Quote:
Originally Posted by NJKris View Post
I discovered that in temps 85 or hotter, if tank is not dumped every few days, and I don't double the amount of tank treatment (I use TST orange syrup), horrible things can happen with fumes, causing you to run outside while trying not to wretch. You being in NOLA, this would not surprise me. Black tank down there can turn into a horrid crock pot right quick!
Over the years I've read on almost all toilet chemical instructions words to the effect "in hot weather more frequent addition of chemucal may be required to control odor".

Vents carry odor up and out but when flushing the longer the flush valve is open "at the close of busuness" there will always be some odor escape. It's the strength of that small amount that does the damage and more deodorizer in the tank is needed in hot weather.
__________________
"A wise man can change his mind. A fool never will."

"You only grow old when you run out of new things to do"

2018 Flagstaff Micro Lite 25BDS
2004 Nissan Titan
TitanMike is online now   Reply With Quote
Old 10-14-2021, 12:01 PM   #7
Senior Member
 
KRedburn's Avatar
 
Join Date: Oct 2017
Location: Quincy, WA
Posts: 1,126
When using your fan in the bathroom only have it on at 10 - 20% speed if you can adjust.
Any higher and a small vacuum will be created. When you press the toilet ball valve you will get some odor.

Use the geo method (google it) minimal if any odor.
Dump black tank only above 3/4 full or if you must put water in to get it to 3/4 min and then dump.

don't know on a force unit but on my 2018 DX3 the lav sink is connected to the black tank. (easy to fill black tank up before dumping)
__________________
Ken and Kathy Redburn
2018 DX3 37TS (The Taj)
KRedburn is offline   Reply With Quote
Old 10-14-2021, 12:13 PM   #8
Senior Member
 
Join Date: Jun 2020
Posts: 227
Quote:
Originally Posted by RickV View Post
Look under your sink there is probably a Air Admittance Valve there that has malfunctioned. Easy to replace. I have found over the years it is better to spend the extra $$$ and get a better replacement valve they are available at Lowes, HD
I've seen this mentioned many times before. My question is how does that affect the black tank? My trailer has two grey tanks with the bathroom sink going to one of them. So it would appear any gases coming from this valve would be from the grey tank and not the black tank.

Just trying to figure that out.
__________________

2021 Cedar Creek Cottage 40CRS

Victron MultiPlus-II 12/3000/120-50 Solar installation
SacRV is online now   Reply With Quote
Old 10-14-2021, 01:12 PM   #9
Senior Member
 
jeff64's Avatar
 
Join Date: Mar 2015
Location: N. Illinois
Posts: 1,928
Whether you have 1 o 2 gray tanks there will be an air admittance valve incorporated. The tank residue can start to reek ,poop or not. Have heard that on some the gray may feed into the black, but haven't had that experience personally. I have had a leaking AAV on my galley tank. It smelled pretty badly
__________________
2016 Flagstaff 27VRL Emerald
14K Equalizer
2020 Silverado 2500HD CC 4X4 6.6L gas 3.73
jeff64 is online now   Reply With Quote
Old 10-14-2021, 01:20 PM   #10
Junior Member
 
Join Date: Aug 2021
Posts: 6
Geo Bio Method

I second the use of the Geo Bio Method.

https://www.trbowlin.com/bio-geo-method/
jmezz911 is offline   Reply With Quote
Old 10-14-2021, 01:30 PM   #11
Senior Member
 
Join Date: May 2014
Location: Halifax Nova Scotia Canada
Posts: 803
Some bath room sinks do not have a proper "p" trap system....Just that new in line round piece of crap
Jim in Halifax is online now   Reply With Quote
Old 10-14-2021, 01:34 PM   #12
Member
 
Join Date: Sep 2019
Posts: 43
I just had this exact scenario. After a long frustrating time trying to diagnose, in the end it was the plastic toilet. Must have gotten "stuff" leached into the cavities somewhere. On faith, I decided to upgrade from the 301 (factory-installed plastic) to a 310 (ceramic). Totally that was the source. In fact, I put the old toilet in the garage waiting for trash day and my wife said "get that thing out of here, it stinks!". It did. Quite unbelievable actually. I could find no defects.


The unplanned benefit is the new toilet is heaven. No more squeeks, feels just like it should not like a cheap RV nasty piece that you worry is going to blow apart when you sit on it. In retrospect, I should have done this upgrade long ago anyways.
Barry Allen is offline   Reply With Quote
Old 10-14-2021, 02:06 PM   #13
Junior Member
 
Join Date: Aug 2013
Location: Phillipsburg, NJ
Posts: 26
2021 rig and you have to replace parts already. Why don’t the manufacturers get it correct the first time. It’s so sad how these Rv’s are cranked out for big money only to have the owner “make right” what should have been right in the first place. It’s upsetting.
Johnny Boy is offline   Reply With Quote
Old 10-14-2021, 02:15 PM   #14
Commercial Member
 
Join Date: Nov 2007
Location: Bristol, IN
Posts: 16,441
Quote:
Originally Posted by Johnny Boy View Post
2021 rig and you have to replace parts already. Why don’t the manufacturers get it correct the first time. It’s so sad how these Rv’s are cranked out for big money only to have the owner “make right” what should have been right in the first place. It’s upsetting.
??? Oh boy, love these posts . You don't even know what is wrong?!?!? Someone "else" said "Oh it's probably the air admittance valve". We still haven't verified that.

Smells like sewer from "time to time". Most RV bathrooms smell like sewer every time you open the valve, if you leave it open for too long.

The OP still hasn't even confirmed what they are using for treatment, if anything.
__________________
Please post questions as a "New Thread" (not private message) so that others can benefit from the answers. Use Private Messages for sensitive information only. Owners manuals are available online and via iPhone/Android Apps.https://www.dynamaxcorp.com/OnlineManual.aspx Don't forget to subscribe to our YouTube page for "How To" videos and updates https://www.youtube.com/c/DynamaxRVs/
bclemens is offline   Reply With Quote
Old 10-14-2021, 03:54 PM   #15
Senior Member
 
MoJoe1003's Avatar
 
Join Date: Oct 2018
Posts: 744
Quote:
Originally Posted by Johnny Boy View Post
2021 rig and you have to replace parts already. Why donít the manufacturers get it correct the first time. Itís so sad how these Rvís are cranked out for big money only to have the owner ďmake rightĒ what should have been right in the first place. Itís upsetting.

Apparently you didnít do any research before posting. Dynamax installs Porcelain toilets in the Force, DX3, DYNAQUEST and Isata 5 models.

There is nothing in OPís posts, at this point, that would indicate replacement is the answer.
__________________
Joe & Cynthia
2021 Dynaquest XL 3801 TS Cindy 'B'
2021 Jeep Wrangler Unlimited Rubicon Diesel
ďBreathe in, Breathe out, Move onĒ
MoJoe1003 is offline   Reply With Quote
Old 10-14-2021, 04:04 PM   #16
Senior Member
 
Join Date: Apr 2016
Location: Cedar Creek Lake, TX
Posts: 3,183
I also recommend checking the air admittance valve. This is a common problem with the exact symptoms you describe.
__________________
Cedar Creek Lake, Texas
2019 Keystone Loredo 290SRL
2019 Ram 2500 4x4 Cummins crew cab
Andersen hitch
CedarCreekWoody is offline   Reply With Quote
Old 10-14-2021, 04:44 PM   #17
Senior Member
 
Join Date: Jan 2018
Location: Raleigh, NC
Posts: 5,014
Not relevant here

Quote:
Originally Posted by Barry Allen View Post
I just had this exact scenario. After a long frustrating time trying to diagnose, in the end it was the plastic toilet. Must have gotten "stuff" leached into the cavities somewhere. On faith, I decided to upgrade from the 301 (factory-installed plastic) to a 310 (ceramic). Totally that was the source. In fact, I put the old toilet in the garage waiting for trash day and my wife said "get that thing out of here, it stinks!". It did. Quite unbelievable actually. I could find no defects.

The unplanned benefit is the new toilet is heaven. No more squeeks, feels just like it should not like a cheap RV nasty piece that you worry is going to blow apart when you sit on it. In retrospect, I should have done this upgrade long ago anyways.
The Dometic 300 (not 301) plastic toilet is not used in Dynamax motorhomes which is the topic here.

The 300's two-part design allowed urine to seep into a cavity between the two layers at the bottom. For a while Dometic was providing free replacements. Now they will give a $75 credit towards an exact-fit, ceramic replacement 310 unit.
__________________
Larry

Sticks and Bricks: Raleigh, NC
2008 Cherokee 38P: at Ivor, VA permanently
Larry-NC is online now   Reply With Quote
Old 10-14-2021, 06:22 PM   #18
Senior Member
 
Join Date: Jun 2015
Location: Albuquerque
Posts: 946
It is always a good idea to check your vent pipe. Just use a hose to run a little water. If it is clogged, you'll have odors. Our houseboat had a failed (by design) vent, and the only way we could control odors was with Oxyclean. Of course that ate the aluminum tank, so it had to be replaced. We use Walmart TST now (with a working vent) and have no odors.

In our trailer, we use the Geo method, again with no odor. Our old trailer has a P trap, so we don't get gray tank odors either.
__________________
2009 Roo 21ss + 2007 Superduty 6.0
mnoland30 is offline   Reply With Quote
Old 10-14-2021, 06:59 PM   #19
Senior Member
 
milkman55's Avatar
 
Join Date: Aug 2016
Location: Canyon Lake, Texas
Posts: 1,771
I use the Geo Method and Happy Vamper as the digestive additive along with Calgon and Dawn liquid. Our issues have dramatically decreased since we started this combo. Regardless, every time the toilet valve is opened, itís a direct line to the black tank. Always leave water in the bowl and close your toilet lid. Also donít run the vent fan when the flush valve is open as it pulls odors from the tank.
__________________
2021 Isata 5 30FW
2014 Honda CR-V
milkman55 is offline   Reply With Quote
Old 10-15-2021, 12:47 AM   #20
Junior Member
 
Join Date: Feb 2021
Location: New Orleans, La
Posts: 8
sewer gas smell

Thanks for the information and comments. I am calling the Manufacturer Rep, was just seeing if anyone had a simple fix.

1) So there is no Admit Valve under the bath sink? Should there be one?

2) I use Porta Pak tank deodorizer. Is there a better treatment?

3) Has a ceramic toilet, not plastic
The Force is offline   Reply With Quote
Reply

Tags
bathroom, gas, roo

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


» Featured Campgrounds

Reviews provided by

Disclaimer:

This website is not affiliated with or endorsed by Forest River, Inc. or any of its affiliates. This is an independent, unofficial site.



All times are GMT -5. The time now is 12:14 PM.