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Old 03-17-2015, 08:48 AM   #1
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Sewer Odor from Washer Area

We have a 2014 390RB-60 and have been stationary in a park in Florida for the past two months. About a week ago DW discovered odors in the area of the washer/dryer. I have checked the mid bath and found no odor, leaks, etc that would be the source. I checked the area behind the washer (thru access panel) and there are no leaks anywhere. I did replace the mechanical air vent fitting n the drain line but that did not solve the problem. Tanks are regularly dumped and chemicals added. I checked outside and found no evidence of any leaks in the tanks or lines.
There does not seem to be any odor coming from inside the washer but we are wondering if that may be the source somehow.
anyone have any suggestions?

2014 390RB-60 "The Shire"
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Old 03-17-2015, 08:51 AM   #2
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My first guess would be the trap not completely filling with water to prevent the flow of the tank gasses......

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Old 03-17-2015, 08:52 AM   #3
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We have had this happen while running the Fantastic Fan with the gray water valve open.
Running a load of clothes through the washer solved the problem.
Oh, and closing the gray water valve.
2014 Berkshire 390RB-60
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Old 03-17-2015, 08:59 AM   #4
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Same here with our 36CKTS CC, make sure water is in trap to block odors from tank.
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Old 03-17-2015, 09:08 AM   #5
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I had this happen with the Air Admittance valve under the vanity with a near full GW tank while using the Fantastic Fan and showering. Dumped the tank and all was well.
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Old 03-17-2015, 09:16 AM   #6
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Marty (mmnsc) had this issue also. There is an air admittance vent in the drain pipe for the washer/dryer and it seems that this went bad. There is a rubber flap inside the vent that either gets stuck or as I said goes bad. He replaced the vent and the problem was resolved.

Shop Keeney Mfg. Co. Plastic Mechanical Plumbing Air Admittance Vent at
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Old 03-17-2015, 01:11 PM   #7
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As TMMAR stated for me, the vacuum break valve on top of the drain trap on the washing machine drain goes bad. I have gone through 3 of these valves as it seems that possibly when the washer drains lint or other debris splashes up on the the rubber disk and keeps it open. We only got the odor when we turned on the exhaust fan in the bath without having the door or window open. The fan pulled a negative pressure in the MH so the only air could come from the vent/vacuum break valve on the washer drain along with the foul odor.

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Old 03-18-2015, 11:21 AM   #8
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As well as checking the vacuum breaker valve on top of the drain trap, the washer hose may be pushed in so far that the trap does not fill with water or there may not be a trap. I had this problem when running the fans in the coach. Fixed it by putting plumbers putty around the top of the drain hose to seal where it goes into the drain pipe.
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Old 03-18-2015, 11:29 AM   #9
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Just dumping the grey tanks can suck the traps dry also.
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Old 03-20-2015, 11:19 AM   #10
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Thanks for all the replies. I changed the vent out and all seems well now!


2014 390RB-60 "The Shire"
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