An air conditioner can stop working for a variety of reasons—mechanical issues, electrical problems, or other malfunctions. When your AC goes out, understanding the possible causes can help you take the right steps to restore comfort in your home. Here’s what might be behind the issue and how to prevent it from happening again.

Dirty or Blocked Air Filters

Clogged filters can restrict airflow, leading to reduced efficiency, frozen coils, and sometimes costly repairs. If the AC unit isn't working due to dirty air filters, check and change them regularly. 

Low Refrigerant Levels

An air conditioner that stops working due to low refrigerant levels won't cool as much as it should, leading to reduced performance and more energy consumption. Troubleshooting refrigerant issues on your own is not advised. Get a professional to check the refrigerant and clear any problems.

Capacitor Failure

Capacitors power the AC motor and can weaken or fail over time. If you notice a humming noise, weak airflow, the AC doesn't start, or the system is short cycling, call an AC technician to get the capacitor checked.

Fan Motor Issues

Fan motor burnout can be another reason why your AC isn't working. A faulty fan motor can lead to slow turning blades and no cool air. To fix the motor, call a professional and help prevent the issue with regular maintenance.

Clogged Condenser Coils

Dirt and debris can surround the coils, reducing their ability to release heat and resulting in reduced efficiency and increased energy use. You can help prevent this buildup in the future by getting a technician to regularly check the coils.

Iced Evaporator Coils

While low refrigerant can be a reason for frozen evaporator coils, dirty filters or blocked vents can also cause this issue. When filters and vents get clogged or dirty, your system's airflow becomes restricted, which causes the AC to keep working hard and freeze the coils. 

To help prevent iced evaporator coils, check and replace the air filters frequently. If the issue persists, book an appointment with an AC technician. 

Call an AC Professional When Troubleshooting Doesn't Work

Summer’s almost here—don’t let the heat sneak up on you!
Stay ahead of rising temps with smart, affordable cooling solutions. We offer flexible financing options to keep your home comfortable without breaking the bank.

If your AC isn’t cooling like it used to—or not at all—it can be a major hassle. Knowing the cause gives you control, but when DIY fixes fall short, it’s time to call in the pros.

Book your preventative maintenance now and avoid unexpected breakdowns during peak season!

One Hour Heating & Air Conditioning® is here with on-time, dependable service. If your system’s acting up, find a nearby location to schedule your appointment today.