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Thread: Smelly a/c

  1. #1
    Join Date
    Jul 2009
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    Central a/c smells

    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
    Last edited by mocall7000; 07-27-2009 at 09:55 PM.

  2. #2
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    May 2009
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    Muncie, IN
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    Your condensate drain may be tied in to your homes drain system without being properly trapped. That's the first place i would look.

  3. #3
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    May 2009
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    A leaking plumbing vent in the attic could be the source of your smell.

  4. #4
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    So, do I call a plumber, or an hvac guy for this trouble?

  5. #5
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    I would call the hvac tech first. He should be able to determine your source of the smell.

  6. #6
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    I agree with the poster that said to 1st look for a busted or simply not installed trap on the drain line.

  7. #7
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    I think I will have a professional look at it.

  8. #8
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    Oct 2006
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    Georgia
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    Quote Originally Posted by mocall7000 View Post
    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!
    <*}(((-< Good work is not cheap!
    >*}(((-< Cheap work is not good!

  9. #9
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    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!

  10. #10
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    Oct 2006
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    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!
    <*}(((-< Good work is not cheap!
    >*}(((-< Cheap work is not good!

  11. #11
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    Quote Originally Posted by fishnfool View Post
    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.

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