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    MLockaby's Avatar
    MLockaby Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Oct 19, 2008, 10:11 PM
    Buzzing noise in ac/heat unit when running
    When I turned my central heat/ac unit to heat this year, it started making a buzzing noise. If you turn the air off, then back on to heat-sometimes it will stop. Other times, it'll take 2-3 times to make it stop. What could be the problem? It doesn't do it all the time, and it only does it with the heat-not the ac.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Oct 20, 2008, 04:03 AM
    It could be a relay making the sound or sometimes the low voltage transformer will also buzz.
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