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I changed the air filter in my Goodman Heat/Cool unit and now the air conditioner won't turn on.

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Hi, check to see if you have a panel kill switch on the indoor unit. If the filter was inside the unit, and you removed the panel, if the door panel is not on just right, it will not close this power switch so the unit will not run. Check it out, I am sure this is your problem.
A/C, Heating Contractor
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Posted on Nov 03, 2010

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  • wendy_d_wayl Nov 03, 2010

    Thank you, that is certainly a good suggestion, however we tried that last night and even with the kill switch manually depressed, the interior fan/blower comes on, but the A/C unit outside will not turn on. This was the solution a year ago when I had the same problem, but not able to resolve it this time. We checked all the breakers, etc. Nothing.

  • Robert Horton
    Robert Horton Nov 04, 2010

    Hi, if you are sure you have power to the outdoor unit, you may have a time delay relay that has gone out, This will stop the contactor from energizing on a call from cooling, It is a small circuit board that is wired with the stat wires, and will lock the unit out. I by pass them to get it to run. Without being on site, I couldn't walk you through this as I would have to see the schematics to do this. Since the indoor unit is coming on, the problem is in the secondary, or 24 volt side not closing the contactor. If you are inclined to do so, remove the control panel at the outdoor unit. The contactor has either 1 or 2 sets of points on it, you will see where your main hot wires come into it and connect. To see if it will run, push the top part of the contactor down with a finger to close the points to see if it will start. If it does not start, its either the time delay board, or no low voltage to close the contactor on its own. If the blower comes on, it will take a few minutes for the outdoor unit to fire up as the stat will also have a delay, along with the one outdoors. Its hard to believe the time delay failed just because of a filter change, but has happened. Try to make sure you have 24 volts at the Red and yellow wires outdoors in cooling, and high voltage getting to the contactor across the 2 hot wires. You will need to get a inexpensive a/c meter to do these checks, its the only way to know. Please keep me posted on your progress.

  • wendy_d_wayl Nov 04, 2010

    You are correct, it was lack of power to the outside unit. My older son who happened to be home (active duty military officer) replaced the fuses in the outside fuse box and fixed it. He showed me how to do it and left me extra fuses. Thank you for your help!

  • Robert Horton
    Robert Horton Nov 09, 2010

    You are very welcome.

  • Robert Horton
    Robert Horton Nov 09, 2010

    Could you please rate me on this post so I may get credit for helping you?
    Shastalaker7, Thank You.



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