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    chinda71's Avatar
    chinda71 Posts: 4, Reputation: 1
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    #1

    Feb 20, 2009, 09:13 PM
    Carrier air handler
    I was hooking up what I thought was a 24v heating wire to a thermostat when I came to later find out it may be 120v. Anyway, I try to manually turn on the fan on my carrier unit and I hear buzzing from the unit and nothing turns on. When I turn it of it does a little buzzing again. I went up and opened the side panel and noticed a blown 5amp fuse, replaced it and it still does nothing. What do you think I blew up and need to replace. It seems to hum from the rear where there looks to be a coil. The model is FB4ANF018

    Thanks
    Jay...
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #2

    Feb 20, 2009, 09:17 PM
    Possible transformer
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #3

    Feb 21, 2009, 09:51 AM
    Do you notice any burnt odor from either the unit or the thermostat?
    chinda71's Avatar
    chinda71 Posts: 4, Reputation: 1
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    #4

    Feb 21, 2009, 10:16 PM
    There was smoke coming from the thermostat when I turned the breaker back on.
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #5

    Feb 22, 2009, 07:03 AM
    I think you can safely assume that the thermostat is ruined. I am puzzled as to how line voltage could have been present amongst the low voltage wiring, if so. Unless you have a multimeter and some basic electrical knowledge, I'm afraid this has become a job for a pro.
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