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    Highway's Avatar
    Highway Posts: 16, Reputation: 2
    New Member
     
    #1

    Jun 9, 2007, 02:55 PM
    Furnace/ AC fan
    My Ac/ furnace fan will not come on. I found a dead short in the power supply, repaired it and the fan worked great. Now it has quit again. I turn it on and hear a buzzing sound and the motor heats up then a relay turns it off. It cools and tries again. The moter is not old and turns freely, as does the fan. What could be the problem?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
     
    #2

    Jun 9, 2007, 06:45 PM
    Try a new capacitor. If that does not get it your motor is probably bad. Motors are not supposed to run to hot to touch unless something is wrong.
    Highway's Avatar
    Highway Posts: 16, Reputation: 2
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    #3

    Jun 10, 2007, 07:44 AM
    What does the capacitor look like and where do I find it?
    esquire1's Avatar
    esquire1 Posts: 2,483, Reputation: 209
    Ultra Member
     
    #4

    Jun 10, 2007, 08:03 AM
    It is in the condensing (outdoor) unit. It will be round or oval. Replace with same size that is in it now.
    Highway's Avatar
    Highway Posts: 16, Reputation: 2
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    #5

    Jun 10, 2007, 08:15 AM
    The A/C compressor works fine. It is the blower in the furnace that will not start. It gets hot and makes a buzzing sound then a breaker or relay shuts it off. I fixed a dead short a week ago. All was good, but now it has stopped again. The furnace is old(mid 70s), but the fan is good and blower is about 2 years old. Could the short ruined the capacitor or motor on the furnace?
    esquire1's Avatar
    esquire1 Posts: 2,483, Reputation: 209
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    #6

    Jun 10, 2007, 08:39 AM
    Inside the furnace, the capacitor will more than likely be on the blower casing. It will be round or oval with 2 leads Brown attached to it. If the blower motor is getting very hot it is shutting off on it's internal overload and will need to be replaced. I replaced one last week that was only 30 days old.
    Highway's Avatar
    Highway Posts: 16, Reputation: 2
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    #7

    Jun 10, 2007, 08:51 AM
    Okay Thanks! I guess the short did this? Should I try the capacitor also?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
     
    #8

    Jun 10, 2007, 08:53 AM
    Try a capacitor first the when and if that does not work change the motor. Remember the capacitor has to be rated for the motor it goes on.
    esquire1's Avatar
    esquire1 Posts: 2,483, Reputation: 209
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    #9

    Jun 10, 2007, 08:55 AM
    Check the fuse at circuit board first
    Highway's Avatar
    Highway Posts: 16, Reputation: 2
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    #10

    Jun 11, 2007, 06:06 AM
    Thanks Guys! I will keep you posted!

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