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  1. #1
    Join Date
    Feb 2008
    Posts
    78

    Is this dirty sock syndrome? Please help.

    We have a Trane Dual-Fuel unit. When the heat pump runs, it gives off a sweet, musty smell. It only smells when the heat pump runs - once the gas heat kicks in, it's gone. I have tested this by cranking up the heat to trigger the aux (gas) heat, and the smell disappears.

    The smell is constant when the heat pump is on. From what I've read, Dirty Sock only causes smell during defrost mode. When does defrost mode occur, and when would that cause the smell? Does it make sense that the gas heat doesn't smell?

    Also, if DSS is caused by micro-organisms living on the coil because heat pumps don't get hot enough to kill it, shouldn't running the gas heat for a certain period of time kill it?

    TIA

  2. #2
    Join Date
    Aug 2007
    Location
    Northern VA 38 degrees N by 76 degrees W
    Posts
    5,058
    Quote Originally Posted by richmod View Post
    We have a Trane Dual-Fuel unit. When the heat pump runs, it gives off a sweet, musty smell. It only smells when the heat pump runs - once the gas heat kicks in, it's gone. I have tested this by cranking up the heat to trigger the aux (gas) heat, and the smell disappears.

    The smell is constant when the heat pump is on. From what I've read, Dirty Sock only causes smell during defrost mode. When does defrost mode occur, and when would that cause the smell? Does it make sense that the gas heat doesn't smell?

    Also, if DSS is caused by micro-organisms living on the coil because heat pumps don't get hot enough to kill it, shouldn't running the gas heat for a certain period of time kill it?

    TIA
    DSS is activated by moisture during defrost, your coil temperature while in the heat mode will probably be around 120 degrees and should not have moisture on it.
    What about a humidifier?

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