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How to Fix a Frozen Air Conditioner

frozen-air-conditioner-dirty-air-filterDuring the summer, our air conditioners have a chance of freezing up. (Usually when we need them the most.)

There are typically 3 reasons your air conditioner has frozen up.

  • Refrigerant Leak- if the amount of refrigerant in your coil is not enough to absorb enough heat, this will result in freezing.

  • Lack of Airflow- this is commonly caused by dirty air filters or undersized air ducts which can cause the temperature of your air conditioner’s cooling coil to drop below freezing.

  • Outdoor Temperature- If the temperature outdoors dropped significantly, this could cause your air conditioner to freeze up.

How to Fix Your Frozen Air Conditioner

No matter the reason for your frozen air conditioner, the first thing you need to do is shut it off to let it defrost. This is to immediately help prevent any serious damage to your cooling system.

Next, check the air filters in your home to see if they are blocked or dirty. If necessary, clean or replace all air filters. Wait about 24 hours before checking for ice on the compressor. If there’s none, this was likely the issue.

If your air filters were not the issue, it could be the lack of refrigerant. In this case, you’ll need to talk to an HVAC contractor about correcting the levels. A professional technician will know exactly where the refrigerant levels should be and can fix any leaks to prevent future issues. There’s also a chance that the issue is coming from issues with the defrost timer which a technician will be able to detect.

Your air conditioner comes with optimal levels of refrigerant, meaning that if they are getting low, this indicates a leak in your system.


If you’re experiencing issues with your air conditioner freezing up, contact your local pros in Hartland at Allstar Heating & Cooling. We’re here when you need us most, so give us a call at 262-361-3900 for 24 hour service.


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All Star Heating & Cooling

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