You can safely try a few basic AC troubleshooting steps before calling a professional. Some of the most common homeowner-fixable issues include a dirty air filter, incorrect thermostat settings, or a clogged condensate drain.
Start with these simple checks before moving on to airflow and drainage. Avoid opening sealed equipment panels or attempting refrigerant repairs. A clogged condensate drain can activate the system's float switch and shut off cooling, even if the thermostat appears to be working normally. If you notice ice on the refrigerant lines, a burning smell, unusual noises, or repeated breaker trips, turn the system off and contact a qualified technician. If these steps don't restore cooling, professional service is available throughout the Atlanta area.
Try these safe troubleshooting steps:
- Set the thermostat to Cool and at least 5°F below the current room temperature, then replace the batteries if applicable.
- Replace a dirty 1-inch air filter and make sure all supply and return vents are fully open and unobstructed.
- Check the HVAC breaker and the indoor furnace or air handler power switch. If the breaker has tripped once, reset it one time only. If it trips again, leave it off and call for service.
- Turn the system off, clear the condensate drain using a wet/dry vacuum if accessible, and gently rinse debris from the outdoor condenser coil with a garden hose. Avoid using a pressure washer.
- If the refrigerant lines or indoor coil are iced over, turn the system off and let it thaw completely, which may take several hours depending on the amount of ice. Once thawed, restart the system. If it freezes again or still doesn't cool, schedule a professional diagnosis.
Updated: 2026-07-02
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