A capacitor is a small, cylindrical component that delivers energy to the motor that powers an air conditioning system. When the capacitor isn’t working properly, the entire system won’t be able to perform as it should. In this article, ductless installation contractor Econoair Heating & Cooling Inc. talks about the common causes, telltale signs and best ways to fix a failing AC capacitor.

AC capacitor failure


While only a qualified HVAC technician can determine the primary cause of capacitor failure in your air conditioning unit, some of the most common reasons that this part stops working are:

  • Physical damage to the capacitor; for example, wind-driven debris hitting the unit.

  • Incorrect voltage or current coursing through the capacitor.

  • Age-related wear and tear.

  • Overheating of the unit.


An obvious warning sign doesn’t always arise before a capacitor breaks down. However, boiler installation experts say that you may notice at least one or two of the following symptoms that indicate a problem is at hand:

  • As the capacitor starts to malfunction, acrid-smelling smoke may emit from the component due to the chemicals.

  • Chemicals within the capacitor may leak out as the equipment crashes.

  • The capacitor may fail to kickstart at irregular intervals, resulting in occasions when the air conditioner is unable to perform its function.


When your air conditioner’s capacitor breaks down, professional service is needed. An experienced technician can determine whether your capacitor should be restored with a repair or must be replaced for a more long-lasting, efficient solution. If you’re replacing your capacitor, be sure to get the appropriate voltage and microfarad and you’ll be all set.

Contact Your Local HVAC Company Today!

Econoair Heating & Cooling Inc. is a premier source of top-rated HVAC solutions, including air conditioner installation, duct cleaning and more. Our certified technicians are here to deliver the comfort and efficiency that your home needs. Call our professional team today at 905-763-2400 or fill out our contact form to schedule a free consultation. We serve clients in and around Richmond Hill, Ontario.

Author Bio

Bruce Pou