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

    Sep 12, 2008, 09:58 PM
    Central AC blowing warm air, outside unit not running
    My question is the following:

    My inside central AC is blowing warm air. I've checked the thermostat, its OK, I've checked the breaker and that seems OK. This started after a power outage that we had about 2 weeks ago and my unit outside does not run when the inside unit is running. In fact, the outside doesn't run at all. I pulled the fuse/breaker and reinserted, still nothing.

    It was installed brand new in 2004, $5000, its and American Standard/Trane, any suggestions as to what could be wrong.. before I spend a ton of money on a service visit, it's a $100 here.

    Thank you so much, fans just don't do it here

    Karen
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Sep 13, 2008, 06:37 AM
    pulled the fuse/breaker and reinserted, still nothing.

    Did you test the fuses if fuses are present?
    mygirlsdad77's Avatar
    mygirlsdad77 Posts: 5,713, Reputation: 339
    Plumbing Expert
    		  
    #3

    Sep 13, 2008, 02:19 PM
    Are your themostat wires exposed outside? If they are check to see that they haven't been damaged. If they aren't, go to your furnace and find where the thermostat wires connect to the board. Jumper terminals r and y and see if the unit comes on outside
    EPMiller's Avatar
    EPMiller Posts: 624, Reputation: 37
    Senior Member
    		  
    #4

    Sep 13, 2008, 03:08 PM
    I apologize for my comment (now edited out). I was confusing 2 posts.

    First verify you have 240 volts out at the ODU (outdoor unit) disconnect box. Then get someone to get the tstat to call for cooling while you listen at the ODU. You should hear the contactor pull in. If the contactor pulls in, then the tstat signal is getting there. If it doesn't, then maybe the contactor is bad. Or the low voltage supply. Or something at the IDU.

    If that happens then listen for humming. If not then maybe the contactor contacts are bad. Or the capacitor(s) is bad. I think this one has a control board which could be bad also. Is the compressor (the big metal canister down in the center) running? Does the fan on top run? If one or the other isn't running then you've at least isolated the problem to that part.

    I could go on, I've only scratched the surface of troubleshooting. I still didn't touch the IDU, but you get the picture. On these systems you might just have to call for service. Unless you have the tools, are good at reading schematics and know what is supposed to be happening and when. At least you did a couple of elementary checks and know more now than when you started. Congratulations.

    EPM
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