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Question: Why does my AC capacitor fail so often? Every two years!

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Question: Why does my air conditioner capacitor go out and fail so often? We are having to replace our capacitor about every two years? Why does my AC capacitor fail so often?

Answer: Air conditioner and heat pump capacitors going bad has been the number one problem for service calls in our business for many years! In this post, AC Service Tech and I tell you why capacitors go out so often. There are 4 reasons why capacitors go out so often. We hope this post will help you understand what makes capacitors fail and hope this helps make your capacitor last longer. It is always a good idea to have an extra capacitor on hand in case one fails on a hot summer day or night. We sell capacitors on the following page: Please click here to see the capacitors that we sellAC Service Tech made an excellent YouTube video below that explains why capacitors fail. Thanks so much, AC Service Tech for making this excellent video! Here are 4 reasons why capacitors fail so often:

  1. High Heat causes the oil (dielectric fluid) inside the capacitor to get hot and expand which causes the capacitor to fail. If the shroud of your air conditioner is out in the hot sunny side of your home that receives lots of heat then this can cause the capacitor to fail.  A sure sign that shows that a capacitor has failed is an expanded mushroomed topped capacitor where the top or bottom of the capacitor is mushroomed and is expanded out. Some capacitors leak the dielectric fluid out after they have failed.
  2. Capacitors do have a life span. The life span of the capacitor is limited and depends on the operating temperature to which the capacitor is being exposed. A capacitor that is exposed to High heat will have a shorter life span. When you test a capacitor and see that the MFD/uf rating is lower than the specs on the capacitor then this is what has happened the heat over time has caused the capacitor to lose its value.
  3. If you exceed the voltage rating that is listed on the capacitor then this will hurt the capacitor.  If you have a voltage spike or a lightning strike then this will destroy a capacitor.
  4. Bad rusty loose connections can destroy a capacitor because loose connections cause high heat and arcing. I have seen where the terminals are burnt off on capacitor connections.

If you have any questions please comment below or email us at  We Would Love to try and help You out! 

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