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Thread: furnace noise

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  1. #1
    Join Date
    May 2001
    Posts
    81
    Hey guys I was at a freinds house and they started there forced air natural gas furnace and it made a loud humming noise I know it wasn't the fan it sounded like it's comming from the heat exchanger the burner flames looked good.
    I have never heard this before I wounder if this is a sign of a bad heat exchanger.
    I didn't have any tools and I mainly work on commercial equipment so I don't have a huge amount of experience on furnaces and if it could be dangeres I'd like to let them know.

  2. #2
    Join Date
    Nov 2001
    Location
    east kansas
    Posts
    8,012
    I've heard a harmonic in cold HXers before.
    Beware of advice given by some guy on the Internet.

  3. #3
    Join Date
    May 2001
    Posts
    81
    did it go away after things warmed up?
    thanks for the reply

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