Old Guard wrote:
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Wrong!!! The 2005 (3400RL) went into the black tank, and there were other units
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I forget we are dealing with a product where there seems to be no standard plumbing or wiring, in 2005 all or some could have had the plumbing for the W/D go to the black tank, however if it did and the drain from the W/D was capped then "no" smell should come from there.
The black tank "should" have a roof vent, the AC can draw smell in from that or as I stated when the toilet is flushed and the AC or something else is trying to draw air from the outside with no window open then it can come in from the vent and out the toilet.
As suggested, check your roof vent, especially if it is near the front AC. Check to make sure the W/D drain is capped as well.