We bought a new house three years ago and had a new AC unit installed in the bedroom. With a water drain going into the wall to get rid of the moisture that the AC takes out of the air. We have had occasional problems with a nasty smell in the bedroom since about two years and the AC install guys came here to check at least 6 times and they clean the AC but can't find anything wrong. We even had Mitsubishi come over to check if there was a problem with the AC itself, but they can't find anything wrong.
So I just tried to find the problem myself and found that the pipe going into the sewer looks like it has some growth on it. (see picture). This is what I believe the smell comes from. Unfortunately it is situated in a position I can't reach to take out the pipe and clean it without detaching the entire AC from the wall.
Can this growth be caused because there is no trap in the pipe somewhere? The pipe goes into the wall and I can't check, but when the AC is on for a while I hear the water drip in the shower drain which is on the other side of the wall where the AC is installed. It is not sewer guess though, more like fungus...
Can I seal the pipe from the top with something so the smell won't come up? Or should I just call a plumber and let them break the wall to put a trap in there? Any ideas would be highly appreciated.
Kind regards,
Ilan
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