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Central air unit compressor won't run. low side is 120+ psi and high side is 178 psi. what reasons would cause this.

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You will need to replace the run capacitor on your unit. I will also give you the link to a great website that you should keep in case you have other issues with your unit you can always refer there to the most common causes of AS units not working. But what you have said is a VERY common sign that the run capacitor is bad and needs to be replaced;

http://toad.net/~jsmeenen/compressor.html

Posted on May 31, 2010

  • Jeff Landis May 31, 2010

    air conditioner has only one compacitor, must be start and run. you still think it is the compacitor?

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