Quick Steps to Repair a Frozen Air Conditioner

Does the air emitting from your supply registers suddenly seem hot? Look at the indoor component of your air conditioner. This part is housed within your furnace or air handler, if you have a heat pump. If there’s water dripping onto the floor, there may be crystals on the evaporator coil. The AC coil in the unit may have frozen over. You’ll need to defrost it before it can cool your residence again. 

Here’s the steps you should take. If you can’t get the coil defrosted, Service Experts Heating, Air Conditioning & Plumbing is here to support you with air conditioning repair in the U.S. that includes a a 100% satisfaction guarantee.* 

Step 1: Set the Air Conditioning to Off and the Blower On 

To get started—switch the thermostat from “cool” to “off.” This stops cold refrigerant from flowing to the outdoor compressor, which could damage it and cause a costly repair. 

Then, adjust the fan from “auto” to “on.” This produces hot airflow over the frozen coils to force them to melt faster. Double check to set the cooling mode to “off” so the air conditioner doesn’t trigger a cooling cycle. 

It may take not more than an hour or the better part of a day for the ice to defrost, depending on the extent of the buildup. While you’re waiting, keep an eye on the condensate pan underneath the AC unit. If the drain line is obstructed, it could spill over as the ice melts, potentially creating water damage. 

Step 2: Troubleshoot the Problem 

Bad airflow is a leading cause for an AC to become frozen. Here’s how to figure out the issue: 

  • Look at the filter. Low airflow through a dirty filter could be the culprit. Look at and replace the filter once a month or once you notice dust buildup. 
  • Open any sealed supply vents. Your house’s supply registers should stay open all the time. Shutting vents reduces airflow over the evaporator coil, which may result in it freezing. 
  • Check for covered return vents. These typically don’t use moveable louvers, but furniture, rugs or curtains can still block them. 
  • Low refrigerant: While airflow restrictions are the most common culprit, your air conditioning might also be low on refrigerant. Depending on when it was replaced, it may use Freon®. Not enough refrigerant calls for skilled attention from a certified HVAC technician. H2: Step 3: Get in Touch with an HVAC Pro at Service Experts Heating, Air Conditioning & Plumbing 

If low airflow doesn’t seem to be the trouble, then another problem is making your AC freeze up. If this is what’s going on, merely thawing it out won’t repair the problem. The evaporator coil is likely to keep freezing unless you take care of the underlying cause. Call an HVAC tech to check for problems with your air conditioner, which might include: 

  • Refrigerant leak: AC units continuously use refrigerant, so it shouldn’t run out. Insufficient refrigerant indicates a leak somewhere. Only a technician can find the leak, mend it, and recharge the system to the proper concentration. 
  • Filthy evaporator coil: If dirt accumulates on the coil, air can’t get to it, and it’s likely to freeze. 
  • Nonfunctional blower: A faulty motor or unbalanced fan could stop airflow over the evaporator coil. 

The next time your AC freezes up, contact the ACE-certified pros at Service Experts Heating, Air Conditioning & Plumbing to fix the issue. We have a lot of experience helping homeowners diagnose their air conditioners, and we’re certain we can get things operating again in no time. Contact us at 866-397-3787 to book air conditioning repair in the U.S. with us right away. 

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