3 Simple Ways to Fix a Frozen Air Conditioner

Does the air flowing from your supply registers suddenly appear warm? Check the indoor portion of your air conditioner. This component is located in 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 equipment might have frozen. You’ll need to melt it before it can cool your residence again.

Here’s what to do. If you can’t get the coil frost-free, Bob Brown Service Experts is here to help with air conditioning repair in Tempe backed by a 100% satisfaction guarantee.*

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

To get started—move the thermostat from “cool” to “off.” This stops chilly refrigerant from moving to the outdoor compressor, which could damage it and result in a pricey repair.

Next, switch the fan from “auto” to “on.” This produces heated airflow over the frozen 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 might take less than an hour or the majority of the day for the ice to defrost, depending on the extent of the accumulation. While you’re waiting, watch the condensate pan under the AC unit. If the drain line is blocked, it may cause a mess as the ice melts, possibly causing water damage.

Step 2: Troubleshoot the Issue

Not enough airflow is a prime reason for an AC to freeze up. Here’s how to troubleshoot the issue:

  • Exmaine the filter. Inadequate airflow through a clogged filter could be the culprit. Inspect and put in a new filter once a month or immediately when you notice a layer of dust.
  • Open any sealed supply vents. Your residence’s supply registers should remain open constantly. Closing vents limits airflow over the evaporator coil, which can result in it freezing.
  • Check for obstructed return vents. These typically don’t use moveable louvers, but furniture, rugs or curtains can still block them.
  • Not enough refrigerant: While airflow restrictions are the most frequent suspect, your air conditioning may also have insufficient refrigerant. Depending on when it was installed, it may have Freon® or Puron®. Low refrigerant calls for skilled assistance from a certified HVAC technician. H2: Step 3: Call an HVAC Technician at Bob Brown Service Experts

If poor airflow doesn’t feel like the issue, then another problem is causing your AC freeze. If this is what’s going on, simply defrosting it won’t fix the issue. The evaporator coil will possibly freeze again unless you take care of the main problem. Get in touch with an HVAC technician to address troubles with your air conditioner, which might include:

  • Refrigerant leak: AC units recycle refrigerant, so it shouldn’t get used up. Insufficient refrigerant signals a leak somewhere. Only a pro can pinpoint the leak, fix it, and recharge the air conditioner to the appropriate amount.
  • Filthy evaporator coil: If grime accumulates on the coil, air can’t get to it, and it’s likely to freeze.
  • Broken blower: A defective motor or unbalanced fan could halt airflow over the evaporator coil.

When your AC freezes up, get in touch with the NATE-certified specialists at Bob Brown Service Experts to repair the trouble. We have years of experience helping homeowners troubleshoot their air conditioners, and we’re confident we can get things working again quickly. Contact us at 623-243-4517 to get air conditioning repair in Tempe with us now.


*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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