Troubleshooting5 min read
AC Not Cooling? Here's What to Check
Last updated: January 2024
A malfunctioning air conditioner on a hot day is frustrating. Before calling for service, try these troubleshooting steps to potentially save time and money.
Quick Checks
1. Check Your Thermostat
- Ensure it's set to "Cool" mode
- Set temperature at least 5 degrees below room temperature
- Check that the fan is set to "Auto" not "On"
- Replace batteries if applicable
2. Inspect the Air Filter
- A dirty filter restricts airflow
- Replace if it looks clogged or hasn't been changed in 3+ months
- Use the correct size and type for your system
3. Check the Circuit Breaker
- Look for tripped breakers in your electrical panel
- Reset if needed by turning fully off, then back on
- If it trips again immediately, call a professional
4. Clear the Outdoor Unit
- Remove leaves, grass, and debris around the condenser
- Maintain 2-3 feet of clearance on all sides
- Gently clean the fins with a soft brush if dirty
When to Call a Pro
If the above steps don't resolve the issue, you may have a more serious problem:
- • Low refrigerant - Requires EPA-certified technician
- • Frozen evaporator coil - Indicates airflow or refrigerant issues
- • Compressor failure - Major repair requiring professional
- • Electrical issues - Safety hazard, call immediately
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