3 Simple Ways to Fix a Frozen Air Conditioner

Does the air emitting from your supply registers abruptly appear not cold enough? Look at the indoor component of your air conditioner. This part is located within your furnace or air handler, if you have a heat pump. If there’s water seeping onto the floor, there could be crystals on the evaporator coil. The AC coil inside the unit might have frozen. You’ll need to melt it before it can cool your residence again.

Here’s the steps you should take. If you can’t get the coil defrosted, R & M Climate Control Service Experts is here to assist you with air conditioning repair in Knoxville backed by a 100% satisfaction guarantee.*

Step 1: Turn the Air Conditioning Off and the Blower On

To begin—set the thermostat from “cool” to “off.” This stops chilled refrigerant from moving to the outdoor compressor, which could hurt it and lead to a pricey repair.

Then, adjust the fan from “auto” to “on.” This produces warm airflow over the crystallized coils to make them melt faster. Remember to set the cooling mode to “off” so the air conditioner doesn’t start a cooling cycle.

It may take less than an hour or the better part of a day for the ice to thaw, depending on the extent of the accumulation. While you’re waiting, keep an eye on the condensate pan under the AC unit. If the drain line is obstructed, it may overflow as the ice melts, likely causing water damage.

Step 2: Pinpoint the Issue

Low airflow is a leading explanation for an AC to frost over. Here’s how to figure out the issue:

  • Look at the filter. Inadequate airflow through a dusty filter could be the culprit. Check and put in a new filter once a month or once you see a layer of dust.
  • Open any sealed supply vents. Your house’s supply registers should stay open constantly. Shutting vents reduces airflow over the evaporator coil, which may lead it to freeze.
  • Be on the lookout for obstructed return vents. These often don’t use moveable louvers, but furniture, rugs or curtains can still obstruct them.
  • Not enough refrigerant: While airflow restrictions are the most common culprit, your air conditioner may also not have enough refrigerant. Depending on when it was replaced, it may have Freon® or Puron®. Low refrigerant requires pro support from a certified HVAC tech. H2: Step 3: Get in Touch with an HVAC Tech at R & M Climate Control Service Experts

If low airflow doesn’t feel like the problem, then another problem is making your AC frost over. If this is what’s happening, just defrosting it won’t fix the issue. The evaporator coil will probably freeze again unless you take care of the main issue. Get in touch with an HVAC tech to check for problems with your air conditioner, which might include:

  • Refrigerant leak: AC units recycle refrigerant, so it shouldn’t run low. Low refrigerant is a sign of a leak somewhere. Only a professional can pinpoint the leak, fix it, and recharge the system to the appropriate concentration.
  • Dirty evaporator coil: If dirt builds up on the coil, air can’t get to it, and it’s likely to freeze.
  • Nonfunctional blower: A broken motor or unbalanced fan can halt airflow over the evaporator coil.

The next time your AC freezes up, contact the NATE-certified pros at R & M Climate Control Service Experts to repair the issue. We have years of experience helping homeowners diagnose their air conditioners, and we’re certain we can get things operating again fast. Contact us at 865-229-6176 to get air conditioning repair in Knoxville with us today.


*Not applicable to the Advantage Program. See your signed Advantage Program agreement for full details and exclusions. 100% Satisfaction Guarantee is subject to certain restrictions and limitations as set forth in the applicable Terms and Conditions.

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