AC Repair Guide: Troubleshooting, Maintenance & Service Tips

No one wants to be caught in the peak of summer heat with an air conditioner that is not working. For homeowners in Columbia, Lexington, Chapin, Irmo, and West Columbia, understanding how to troubleshoot AC issues and maintain your system can help prevent uncomfortable breakdowns and unexpected repair calls.

At Cassell Brothers Heating & Air, we understand the value of proactive AC maintenance. This guide offers practical AC repair tips, do-it-yourself AC maintenance steps, and guidance on when to call for air conditioning service. Whether you are preparing for summer or dealing with a mid-season problem, these tips will help you get the most from your system.

AC Won’t Turn On

If your AC will not turn on, it could be a simple fix or a sign of something more serious. Check your thermostat first to ensure it is set to cooling mode and the temperature is set lower than the current room temperature. If nothing happens, check the circuit breaker to see if it has tripped.

If the breaker continues to trip or you hear buzzing, but the unit does not start, stop and contact a professional. Electrical issues should never be handled without proper training.

AC Turning On and Off Repeatedly

Short cycling, or turning on and off too frequently, can wear out your system and increase your energy bill. Start by replacing your air filter. A clogged filter can restrict airflow and confuse the system’s thermostat.

If that does not help, it may be caused by low refrigerant levels, thermostat placement, or a failing compressor. These problems should be addressed by an air conditioning service professional.

AC Is Constantly Running

A system that runs non-stop can mean your home is not cooling efficiently or the unit is undersized. First, make sure the windows and doors are sealed. Then, check the thermostat settings.

If the issue continues, dirty coils, a faulty thermostat, or aging components could be to blame. Scheduling professional AC service will help diagnose and resolve the cause.

AC Is Not Blowing Cool Air

When your central air is not working as expected, it often comes down to airflow or refrigerant. Start by checking the filter. If it is clean, try setting the thermostat several degrees lower and give the system time to respond.

If the air still does not cool, it could be a refrigerant issue, compressor failure, or a problem with the ductwork. These are not DIY air conditioner repair jobs and should be handled by trained technicians.

Air Isn’t Flowing

If your system is on but very little air is coming out of the vents, you could have a blocked duct, a failing blower motor, or a dirty evaporator coil. This is another situation where changing the filter may help, but if the issue persists, a technician should inspect the internal components.

AC Unit Is Leaking Liquid

Pooled water around the AC unit is usually a clogged condensate drain line. Algae and dirt can build up in the line and stop water from draining. You can try flushing the line with a diluted vinegar solution, but if the leak continues, it is time for professional air conditioner repair.

If the leak is refrigerant, which often has an oily texture, do not attempt to fix it yourself. Refrigerant leaks require emergency AC repair and proper handling due to safety and environmental concerns.

AC Unit Is Freezing

A frozen unit, especially on a hot day, is often a sign of poor airflow. Dirty filters or coils can restrict circulation and cause the system to ice over. Turn the system off and allow it to thaw completely before restarting it with a new filter.

If it freezes again, you may have a refrigerant or blower issue that requires professional inspection.

AC Unit Smells Bad

Unusual odors coming from your vents could point to mold, mildew, or even burned wires. A musty smell often means moisture buildup in the drain pan or ducts. Cleaning or replacing the filter can help, but lingering smells should be checked by a technician to prevent health risks or fire hazards.

Thermostat Is Malfunctioning

Sometimes the problem is not with the AC at all, but with the thermostat. If your AC thermostat is unresponsive, showing incorrect temperatures, or frequently resetting, try replacing the batteries or resetting the unit. If it continues to act up, it may need replacement or recalibration.

Some AC problems may be resolved with basic troubleshooting or maintenance, but if the same issue keeps returning, or if new problems start showing up, it is time for professional support. Cassell Brothers Heating & Air offers trusted air conditioning repair in Columbia, Lexington, Chapin, Irmo, and West Columbia.

Our technicians are trained to identify the root cause and resolve it quickly, so you can avoid costly emergency air conditioner replacement situations. We also offer service warranties for added peace of mind.

To help reduce the need for future repairs, consider regular AC maintenance throughout the year. Staying on top of seasonal tune-ups ensures better performance and fewer surprises.

Take care of your system now to stay cool all summer. For expert AC repair and air conditioning service, schedule with Cassell today.