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My ac unit is not working properly. It stoped working the other day and we called a HVAC out. He said it was the transformer. Replaced that and put a new stat on. Then in less than 24 hours the thing stops again. Replaced the transformer again. The unit will not work right. The fan blows on the (on) position and the heater part works but everytime we turn on AC it makes a buzzing or humming sound and does not come on. If we leave it like that it will burn out the transformer. We replaced the relay switch and that was not the problem. I went through the wires as best I could to make sure everything was contacting correctly. Then tried it again and it worked.. but then out of nowhere it stoped!! and now it will not come back on just humming . It is getting energized thru the transformer but not turning on and the transformer is getting to hot. so what could be the problem???

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  • craftj00 May 24, 2009

    someone said it is the wire that goes from the stat to the outside unit it does have exposed wires have had problems before with the inside unit on and the outside not we tied the wires back together , but we didnt seal them prop. i think the dog that goes under there has made the wires that should be touching touch. he said when this happens that it will cause a temporay short and the inside unit will try to come on but wont and the transformer will burn out. so we should fix the stat wire that runs from the inside unit to the outside unit. does that sound right>>??

  • Dennis Boxerman May 11, 2010

    When you say you replaced the relay, are you talking about the contactor in the outside unit? Let me know and we'll try to get it going.

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  • Master
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You are going to have to eplace the contactor inside of the outdoor unit, the coil is weak

Posted on May 24, 2009

  • Todd Born
    Todd Born May 24, 2009

    yes that could fix it to wheere it comes out of the house you can put it into whats called sealtite and tywrap it to the suction line then the dog will have a tough time gettign to it again.

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