Why Is My Ac Not Working?
Why is my AC not working? It’s a question no one wants to ask especially during a heatwave. Few things are more frustrating than an air conditioning unit not working when you need it most. Whether it’s blowing warm air, not turning on, or making strange noises, an AC not functioning properly can quickly disrupt your comfort and routine. Identifying the root cause early can save you time, money, and stress. In this guide, we’ll break down the most common problems, share practical troubleshooting tips, and help you understand when it’s time to call in a professional. Why Is My Air Conditioner Not Cooling the House? Is your AC not functioning like it used to? If your air conditioner stopped working or isn’t cooling your home properly, there could be several reasons behind it. Before calling a technician, there are a few things you can check yourself. Here are some common causes and what they might mean for your system. Dirty or Clogged Air Filters One of the most common reasons for poor cooling is dirty or clogged air filters. When the filters are blocked, airflow is restricted, causing your system to work harder and cool less effectively. Check your filters and replace them if they appear dirty or haven’t been changed in a while. Thermostat Settings It might sound simple, but incorrect thermostat settings can lead to your air conditioner not functioning correctly. Make sure your thermostat is set to “cool” and the temperature is set lower than the current room temperature. Also, ensure it hasn’t accidentally been switched to fan-only mode. Refrigerant Leaks If your AC system has refrigerant leaks, it won’t be able to cool your home properly. Low refrigerant levels can reduce efficiency and may even damage your system. This issue typically requires a professional AC repair to diagnose and fix the leak to restore your system’s performance. Frozen Evaporator Coils Frozen evaporator coils can also prevent your AC from cooling effectively. This usually happens when there’s insufficient airflow due to a dirty filter, blocked vents, or low refrigerant. If you notice ice buildup on the indoor unit, turn off the system and let it thaw before restarting. DIY Checks Before Calling a Technician Before calling for service, here are a few things you can try: These simple steps might get your air conditioner functioning again without the need for professional help. When Poor Cooling Is a Serious Issue If your AC is still not cooling after basic checks, it could be a sign of a more serious problem such as compressor failure, a faulty capacitor, or electrical issues. In this case, it’s best to call a qualified HVAC technician to inspect your system. You may read How Long Do AC Units Last? Why Doesn’t My Air Conditioner Fan Work? If your AC is not functioning properly and you’ve noticed that the air conditioner fan isn’t working, it’s important to understand what might be causing the issue. There are two key fans in most air conditioning systems, and problems with either can lead to poor cooling or system failure. Blower Fan vs. Condenser Fan Understanding the difference between these two fans can help pinpoint the problem: Common Reasons the AC Fan Isn’t Working Here are a few common causes to consider if your air conditioner stopped working or the fan isn’t spinning: 1. Tripped Breakers A tripped circuit breaker is one of the simplest causes. If the breaker connected to your AC has tripped, the fan won’t run. Check your electrical panel and reset the breaker if needed. If it trips again, there may be a deeper electrical issue. 2. Faulty Fan Motor A faulty fan motor can prevent the fan from spinning entirely. Over time, motors can burn out due to wear and tear, overheating, or lack of maintenance. If the fan hums but doesn’t move, or turns slowly, the motor may be the problem. 3. Capacitor Issues The capacitor helps the fan motor start and keep running. If it fails, the fan may not spin at all. Signs of capacitor issues include a humming noise without fan movement or intermittent operation. 4. Thermostat or Control Board Malfunctions A faulty thermostat or control board can send the wrong signals to the system, causing the fan not to activate when it should. Try setting the thermostat to a cooler temperature or switching it to “fan-only” mode to test responsiveness. How to Tell If the Fan Motor Is Burned Out Here are some signs that your fan motor may be burned out: If these symptoms are present, it’s likely time to replace the motor—something best handled by a qualified HVAC technician. My Air Conditioner Isn’t Turning Off If your AC does not work as expected and keeps running constantly—even when the temperature is already cool this could signal a deeper problem. While your air conditioner should cycle on and off to maintain the desired temperature, continuous operation can waste energy, strain the system, and indicate something is wrong. Here are some of the most common reasons why your air conditioner isn’t turning off, along with what to look out for. Faulty Thermostat A faulty thermostat may fail to signal your system to stop once the set temperature is reached. It might be: Try replacing the batteries or resetting the thermostat. If that doesn’t help, the thermostat might need to be repaired or replaced. Stuck Contactor Relay Inside your outdoor unit is a part called the contactor relay, which helps control the flow of electricity to the compressor and fan. If it gets stuck in the “on” position, the AC will continue running even when it shouldn’t. This is an electrical issue and usually requires a professional HVAC technician to diagnose and fix. Dirty Coils or Air Filters Dirty evaporator or condenser coils, as well as clogged air filters, can restrict airflow. This forces your system to run longer to reach the set temperature—or, in some cases, never reach it at all. Check your filters and coils: