Causes of AC unit Failure

There are many causes of AC unit failure, including proper installation and regular AC maintenance. Being negligent about your HVAC system may cause serious problems that could even cause your AC unit to stop working altogether. Here are some common causes of AC unit failure you need to be aware of.

1. Frozen Evaporator Coils

It is important to keep your filters and ductwork clean to allow the air to flow smoothly. Dirty filters and ductwork will lead to blocked airflow. Your evaporator coils will get too cold. Keep this going, and a layer of dirt will build up around it, making it impossible for the system to do its job. So be sure to change your AC filters regularly to avoid any issues from building up within your system.

2. Dirty Condenser Coils

Sometimes, dust and debris build up on the condenser coils. This forces your HVAC system to work extra hard to fulfill its job – keeping you and your family cool. With so much pressure going on for a long time, your machine will overheat and eventually stop working. So it’s important to maintain clean coils by performing a regular tune-up one to two times per year for optimum performance and to avoid potential AC breakdowns.

3. Low Refrigerant

Each AC unit comes with a refrigerant specification that you should follow. But in reality, sometimes people are overcharging or undercharging it. This affects the performance and efficiency of your AC unit. If this is your problem, make sure you hire a professional AC technician who knows exactly how to match the charge with the manufacturer’s specification.

4. Leaked Refrigerant

Refrigerant can also leak. If this is the case, adding or removing refrigerant will not solve the problem. Your air conditioning technician should find the leaks, fix them all, and test the AC again. This treatment will take quite some time, so you’ll need to be patient to ensure all leaks have been repaired.

5. Fan Problem

Your AC unit has two kinds of fans. One blows cool air indoors, and one blows the heat out of your house. Many things can cause your AC fan to stop working, such as lack of lubricant and dirt buildup. This problem usually shows early signs such as poor airflow or not-cool-enough air. If you keep ignoring this problem, it may lead to more serious problems like a damaged compressor and lead to an air conditioning system breakdown.

6. Faulty Circuit Breaker or Fuse

When your air conditioner stops working suddenly or fails to start, don’t force it by turning it on again right away. Wait for about 15 minutes to let the machine cool down. Then, go check your circuit breaker panel or fuse box. Reset your circuit breaker or replace the fuse that connects to your AC. Then try turning your air conditioner on again.

7. Thermostat Problem

A failed thermostat can cause your AC to turn on and off frequently, or even not work at all. You can try to recalibrate or reprogram it. If that doesn’t solve the problem, then maybe you need to replace your thermostat. Another possible thermostat problem is a dislocated sensor, which you can settle by simply readjusting the sensor’s position.


It can be frustrating when you turn on your air conditioning system, but it just doesn’t work. You may wish for a quick fix, but sometimes DIY methods for fixing your AC problems isn’t the best approach and can keep you feeling the heat for longer than necessary.

If you are not sure of the cause of your AC failure, it is better to call a professional to settle the issue and have it resolved quickly.

ECM Air Conditioning, with its headquarters located in Boynton Beach, FL, provides ac maintenance services within Palm Beach County, Broward County, Martin County, and St. Lucie County. If you’re having issues with your HVAC system, we’re on-call and ready to assist you. So if you’re in need of AC maintenance, don’t hesitate to contact us today to schedule AC maintenance! Our Air Conditioning maintenance experts will help you maintain your HVAC system and inform you of any issues that may be discovered, in advance, to help prevent costly unexpected breakdowns.  Call us at 561-295-1763 or contact our AC maintenance team online by clicking here.


Follow ECM Air Conditioning on Facebook

Follow ECM Air Conditioning on Twitter

Follow ECM Air Conditioning on LinkedIn

Follow ECM Air Conditioning on Pinterest

Follow ECM Air Conditioning on the BBB

Browse ECM Air Conditioning Jobs

Translate »