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AC unit with ''test'' plug; test shows ''green'', but AC doesn't work

Sears kenmore 580.75101500

Test feature is part of the plug end that connects to the wall outlet; when I press the test button the green light stays on...but there is a strange buzzing sound (I have no idea if the sound is's a friend's unit).

Thanx for any help.


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  • the FACE
    the FACE Jun 05, 2010

    Sorry, I wasn't clear enough.

    The buzzing only lasts a fraction of a second - and it's coming directly from the combination PLUG END/TESTING DEVICE...NOT from the AC unit itself.


  • the FACE
    the FACE Jun 05, 2010

    Boy, I'm losing my touch at clarity, shastalaker7...I apologize for the mediocre rating - but because of my lack of clarity, the problem wasn't solved.

    The unit does not work at ALL! Zilch, Zip, Nada...the light stays on at the Test Switch/Plug...but absolutely NO RESPONSE from the main AC unit itself.

    Hope I've starightened my mess out. Thanx! ;>)



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Hi, and no this buzzing is not normal. If the test button does not trip, its not to major. It sounds as though you have a relay, fan, compressor, or some other relay that has worn contacts that buzz when power is put to it. If the unit operates and its not to the point it is driving you insane, you can take it apart to locate which relay is the noise one and replace it if you have the skills to tackle it. If it fails completely, not knowing the sequence of operation unless you can read a ladder schematic, you will have problems locating the one that was buzzing. I would remove the front cover if its a wall or window unit to find the control section and locate this buzzing relay to replace it.
Best of Luck to you,

Posted on Jun 05, 2010

Testimonial: "My lack of clarity is to blame for my less-than-top rating..."

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  • Robert Horton
    Robert Horton Jun 05, 2010

    Hi, I see you have already rated me, but I will tell you that it is nothing to worry about. What you are hearing is when you turn it on, all of the amperage the unit uses to start causes this quick buzz. Feel free to use it.


  • Robert Horton
    Robert Horton Jun 05, 2010

    Thats OK, I understand completely. Now that I know the unit is not working, and this buzz is for a split second, I would say that you have a dead short in one of of the units componants. Even though the led at the cord light is on, when you turn the unit on the buzz cuts power due to this short which is the buzzing sound you here.You have either lost the blower motor, maybe the compressor, or even a shorted capacitor. You would have to have to expertice to tear into the control and parts section off this unit to test each componant to locate what is wrong. But I can say doing what it's doing is its way of telling you of a big problem, and this is a safety device on the cord to prevent a faulty part getting hot enough to catch on fire. Its good that it's doing its job, but not good that you more then likely have a fairly serious problem going on. Depending on the age and value of the unit, it may be for the best to compare prices to have it looked at to replacing it. If it is a wall or window unit, it would save you many $$$$ to remove and take it down to a appliance repair house then to call out a tech to trouble-shoot it.They would be able to find the problem very quick as we used to pull these and take them back to the bench and find the problem. You can makes some calls to see. It would best to be left up to a pro that does this and has the right tools and skills to do this, as getting into the freon part of a unit requires that you are certified by the E.P.A. It would be very difficult for me to walk you through the steps it takes to take it apart and test these things also. Wish I could be on site. I thank you for the rating, it was very kind of you. I wish you the best on your decision though. Please keep me posted on the out come.



  • Robert Horton
    Robert Horton Jun 06, 2010

    Thank you very much for the outstanding rating as it was very kind of you to do this for me. I hope that I have given you some direction to follow on this system, and I sincerely wish you the best.



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Any one help me coz our aicon when starting the compressor our house it take power this coz by starter relay shorted....

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