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Why Is My Air Conditioner Frozen?

Monday, August 20th, 2018 at 11:00 am

frozen-pipeLet’s say one day your air conditioner doesn’t seem to be blowing cool air into your home. It certainly sounds like its working, but your home is still hot. You open the indoor AC unit’s cabinet to see if you can spot any problems. What you find is a steel block and copper tubes caked in frost.

The air conditioner makes cold air, so logically, a little ice on the components isn’t a big deal, right? Unfortunately, this is where some AC owners go wrong. A frozen air conditioner is not something to be happy about, but we’ll help you figure out where things went wrong.

Dirty Air Filter

One reason for a frozen air conditioner is as simple as not having changed the air filter. Do you remember the last time you checked it?

The purpose of the air filter is to prevent dust and dirt from mixing with the air conditioner’s sensitive components. If the filter is clogged and can no longer perform its main function, dust can gradually collect on the evaporator coil—hindering its ability to absorb heat—and lead to freezing.

Instructions for locating and replacing the air filter can be found in your air conditioner’s manual. If you’re comfortable with doing it yourself, you can easily change it—just make sure you buy the proper replacement. If you need help, don’t hesitate to call a professional.

Low Refrigerant

This problem is two-part. If you have low refrigerant, it most likely means you have a refrigerant leak that needs to be inspected immediately. It’s also possible that the AC was never charged with the proper amount of refrigerant to begin with, so you’d be wise to have someone check.

Low refrigerant also means lower pressure in the system, which means the refrigerant will expand and get cooler. Too much cold leads to a frozen evaporator coil. Refrigerant-based air conditioners rely on the perfect balance of pressure to properly transfer heat, so a little bit of refrigerant lost can have a bad effect on the system—especially if a leak is gradually diminishing the amount of refrigerant.

Whether or not your low refrigerant is due to a leak or an improper charge, you should call for air conditioning repair in Phoenix, AZ as soon as you suspect this could be the problem.

Bad Blower

As explained above, frozen evaporator coils happen when the evaporator coil gets too cold. Likewise, a lack of airflow can also cause this problem.

The fan in your indoor AC unit is called the blower. After the evaporator coil absorbs warm air from your home, the blower pushes the cool air away from the coils, through the ducts, and into your home. If this fan stops working for some reason, the cool air will remain and lower the temperature far too much.

A burnt out fan motor or an obstruction in the fan’s blades could be the cause of a bad blower. It’s possible that it needs replacement or just a good cleaning.

Don’t try to chip away that ice! Turn off your AC, let it thaw, and contact Cool Touch Air Conditioning and Heating.

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