AC Compressor Not Kicking On? Here’s What to Do
When the temperature rises, the last thing you want is a home AC not working. One of the most common issues homeowners face is the AC compressor not kicking on. The compressor is the heart of your air conditioning system. If it doesn’t run, your AC can’t cool your home.
In this post, we’ll break down what it means when your air conditioner compressor is not starting, the common causes behind it, and actionable steps to troubleshoot the issue.
What Does the AC Compressor Do?
The AC compressor pumps refrigerant through your air conditioning system. It plays a vital role in cooling your indoor air by compressing refrigerant and moving it through the condenser and evaporator coils.
If the AC compressor won’t start, the entire system fails to cool your home, even if the fan and thermostat appear to be working.
Common Causes of an AC Compressor Not Kicking On
- Blown Fuse or Tripped Breaker: A power issue can stop the compressor from receiving power.
- Low Refrigerant Levels: Pressure issues from a refrigerant leak can prevent startup.
- Faulty Start Capacitor: This component jump-starts the compressor. If it fails, the compressor won’t engage.
- Malfunctioning Control Board: The control board may fail to signal the compressor to start.
How to Troubleshoot an AC Compressor That Won’t Start
Try these simple steps before calling for professional AC repair:
- Check the Breaker: Reset if tripped. If it trips again, there’s an underlying issue.
- Inspect the Thermostat: Ensure it’s on “cool” mode and set below room temperature.
- Examine the Air Filter: A dirty filter can cause the system to overheat and shut off the compressor.
- Test or Replace the Capacitor: Use a multimeter or call an HVAC tech if unsure.
When to Call a Professional
If the above steps don’t fix the issue, it’s time to call a licensed HVAC technician. Problems like low refrigerant, burned-out compressors, or electrical faults require professional repair.
Pro Tip: Schedule annual maintenance to prevent compressor failures and other common AC problems.
Final Thoughts
A non-starting compressor can be frustrating, but it doesn’t always mean expensive repairs. Start with the basics: breaker, thermostat, filter, and capacitor. If these don’t work, get professional help.
Addressing compressor issues early ensures better performance, lower bills, and a longer system lifespan.
