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View Full Version : Smelly a/c


mocall7000
07-27-2009, 09:25 PM
When our whole house a/c unit runs, there is a slight, but bothersome sewer gas smell in the house. We first smelled it only in the upstairs bathroom, but now seem to smell it throughout the house. I suspected it originated in the basement, but when I go down there, I don't seem to smell it. Any suggestions? It has gotten worse as of late. Does this seem like an hvac problem, or a plumbing problem?

Thanks in advance!

Mike
RAPHVAC
07-27-2009, 10:05 PM
Your condensate drain may be tied in to your homes drain system without being properly trapped. That's the first place i would look.
freeflow
07-27-2009, 10:07 PM
A leaking plumbing vent in the attic could be the source of your smell.
mocall7000
07-28-2009, 06:42 AM
So, do I call a plumber, or an hvac guy for this trouble?
RAPHVAC
07-28-2009, 07:36 AM
I would call the hvac tech first. He should be able to determine your source of the smell.
elec2hvac
07-28-2009, 07:40 PM
I agree with the poster that said to 1st look for a busted or simply not installed trap on the drain line.
mocall7000
07-28-2009, 08:23 PM
I think I will have a professional look at it.
fishnfool
07-28-2009, 08:33 PM
When our whole house a/c unit runs, there is a slight, but bothersome sewer gas smell in the house. We first smelled it only in the upstairs bathroom, but now seem to smell it throughout the house. I suspected it originated in the basement, but when I go down there, I don't seem to smell it. Any suggestions? It has gotten worse as of late. Does this seem like an hvac problem, or a plumbing problem?

Thanks in advance!

Mike
Is this bath used by any chance? If the tub or sink is not used you probably have a dried out trap, happens alot in houses that do not use the upstairs bath!
mocall7000
07-28-2009, 08:54 PM
I have a shower that is not used in that bathroom. The bathroom will be remodeled in the fall, and it has not been used for a couple of years. I poured water down the drain after reading about the possibility of the trap being dry. So far, no stink! My fingers are crossed. Thanks for the replies, all!
fishnfool
07-28-2009, 09:06 PM
That is definitely your problem then. Make sure you keep water in the tub, shower and sink traps and all smells should leave for good!
elec2hvac
07-28-2009, 09:08 PM
Is this bath used by any chance? If the tub or sink is not used you probably have a dried out trap, happens alot in houses that do not use the upstairs bath!

That was excellent advice. :)