Why Does My AC Click but Not Turn On?
June 11, 2025
If your AC outdoor compressor won’t start but just clicks, you might have an HVAC problem. A clicking AC should be followed up by a thorough inspection. You may have a faulty component or thermostat issue.
- In this guide, we’ll discuss topics related to:
- Understanding the clicking sound from your AC
- Common causes of an AC that clicks but won’t turn on
- Troubleshooting steps to try before calling a technician
- When to call an HVAC professional
- Preventative maintenance to avoid future issues
Read on for more information about diagnosing your HVAC woes.
AC Clicking But Not Starting? Let Advanced Air Fix It!
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Understanding the Clicking Sound From Your AC
A clicking sound coming from your AC could mean several things depending on the origin of that pesky sound.
- A single click from the thermostat is normal unless your AC fails to turn on.
- Repeated clicking near the outdoor unit could indicate an issue with the electrical system or the relay function.
- If you hear clicking followed by no airflow, there may be a problem with the capacitor or contractor. If those components fail, the unit can’t fully power up.
Common Causes of an AC That Clicks but Won’t Turn On
If your AC turns on but does not run, there could be issues with the components responsible for powering up your unit.
- Faulty capacitor. A weak or failing capacitor lacks the power necessary to kickstart the system’s compressor or fan.
- Broken contactor. The AC’s contactor relays power to other components. If it’s broken, the AC cannot turn on.
- Electrical issues. Loose wiring, a bad electrical connection, and a tripped breaker can all prevent your AC from powering up.
- Thermostat problems. Your AC relies on a working thermostat to indicate that it’s time for the AC to start.
- Compressor failure. A locked or failing compressor may sound like it’s firing up the AC, but the AC won’t fully power on.
Troubleshooting Steps to Try Before Calling a Technician
Here are basic troubleshooting steps for an AC that is clicking but not turning on.
- Check the thermostat settings. Make sure the thermostat is set to “cool” and at a lower temperature than the room’s current ambient temp.
- Inspect the circuit breaker. Check your breakers to ensure there is power to your AC unit. Reset as needed.
- Look at the outdoor unit. Inspect your outdoor unit for any dirt or debris that could be clogging the coils and restricting airflow.
- Listen for additional noises. See if you hear strange humming or clicking sounds that could indicate capacitor or electrical issues.
- Try resetting the AC. Turn off your AC. Let it cool for a few minutes, and restart to see if your issue is resolved.
If these steps fail, it’s time to call Advanced Air.
When to Call an HVAC Professional
When your AC unit is clicking but not turning on, you need expert assistance. Other signs it's time to give the professionals a call include:
- Persistent clicking noises even after you reset your system
- An AC that clicks but never starts
- A breaker that repeatedly trips whenever you try to turn on your AC
- A burning smell
- Visible damage to your outdoor unit
Preventive Maintenance to Avoid Future Issues
An AC that clicks but doesn’t turn on is a problem, but there’s a chance you could prevent malfunctions long before those clicks occur. It all hinges on preventative maintenance.
To safeguard your home and help prevent costly repairs:
- Schedule annual tune-ups to inspect all AC components and related wiring.
- Replace your air filter every month.
- Keep your outdoor unit clean by removing debris regularly.
- Periodically test your thermostat.
Reliable Cooling Starts With Expert Service — Book an AC Inspection Now!
Regular maintenance can help prevent HVAC problems before they have a chance to start. Since 1989, Advanced Air has taken care of Southwest Florida residents and their HVAC systems. Our 100% satisfaction guarantee ensures you can be confident in your scheduled AC repair services. Our honest and professional technicians can’t wait to help!
- Posted in:
- Air Conditioning