Stay Cool: How To Troubleshoot and Repair a Faulty AC Capacitor

Brett Shannon
Your AC capacitor is a small cylindrical device and the main electrical component that powers your AC fan motor.
As such, it’s one of the most important parts of your air conditioning – and you need to understand the signs of a damaged capacitor.
With that in mind, the team at Peppy Heating and Cooling is here to discuss some common AC capacitor troubleshooting issues.
Signs of a Faulty Capacitor
The AC capacitor runs your AC motor, so the most common symptoms of capacitor damage relate to AC performance.
No Cool Air
The capacitor runs your AC fan motor, so if your AC unit has low or no airflow, then the capacitor might be the culprit.
The capacitor also affects the compressor motor, so another symptom is if your AC only blows lukewarm air, regardless of the thermostat setting.
High Energy Bills
A malfunctioning capacitor might pull more electricity than necessary, making high energy bills a common sign of a damaged capacitor is high energy bills.
If your AC bills start to spike but your AC usage hasn’t changed, you can test your capacitor to determine the problem. Compare your current and previous statements to get an idea of any long-term performance decrease.
Frequent Shutdowns
Your central air system should cycle about two to three times per hour. If it cycles more frequently or randomly shuts down during cycling, the most likely culprit is the capacitor.
Most small room air conditioners usually have automatic shut-down mechanisms if they overheat, and a malfunctioning capacitor may frequently trip these breakers.
AC Won‘t Turn On
The most obvious sign that your capacitor is shot is that your AC just won’t turn on.
A damaged capacitor can power your AC motor, so you’ll need it replaced to get your system back in working order. A professional HVAC technician can diagnose the exact issue and repair or replace your capacitor.
Testing Your AC Capacitor
If you are unsure if your capacitor is broken, you can test it with a multimeter to determine its condition.
Before testing, you should also turn off the electrical power to your system.
Then, put the multimeter leads on either end of the capacitor and read the measurement.
If your AC capacitor works properly, the reading should be within its capacitor rating. Most capacitors have a rating between 370 and 440 volts or two to 80 microfarads.
Should I Call an Expert?
When working with any kind of electrical HVAC components, it’s always a better idea to contact an expert.
HVAC electrical systems are complex and can be dangerous if modified improperly. Expert technicians will not only provide quick repairs but help you find a new AC unit for your space if a replacement is necessary.
Trusted HVAC Contractor in Boise, ID
Contact Peppy Heating and Cooling online or give us a call today at (208) 906-6928 to schedule an appointment for AC capacitor repair or replacement in Boise, ID!