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Winter Woes: Frozen A/C Unit

January 25, 2018 | Blog

Winter Woes: Frozen A/C UnitA frozen central A/C is one of the most exasperating problems to deal with, especially this time of year. When you realize you have a frozen A/C unit, shut it off via the thermostat and adjust the fan setting to “on” so air keeps flowing over the coil to help it defrost. As the buildup melts, empty the condensate pan regularly so it doesn’t overflow and cause any water damage.

Once you get the A/C defrosting, you can start to investigate why it iced up, which may be:

Inadequate Airflow Across the Coil

A drop in airflow over the coil can allow frost and then ice to form, which eventually results leads to a full-out ice up. A lack of adequate airflow may be due to:

  • Clogged air filter. If you haven’t replaced your A/C air filter recently, it may be suffocating the cooling system. Putting in a clean filter may solve the icing problem, but wait until the coil has thawed completely before you turn the A/C back on.
  • Closed/obstructed registers. Your HVAC system was designed with a specific number of supply and return ducts/registers for ample airflow. If you have to open or clear one or more registers, you can try restarting your A/C once it’s defrosted.
  • Faulty fan motor. A well-functioning blower fan is a necessity to push air across the evaporator coil, and you’ll need the help of an HVAC technician if it’s malfunctioning or has quit running.

Dirty Evaporator Coil

A buildup of dirt and debris on the coil will inhibit heat transfer and eventually cause ice to form. The coil must be cleaned to restore your A/C’s functionality, so call a trusted local HVAC contractor for help right away.

Low Refrigerant Levels

A drop in your system’s refrigerant level is likely due to a leak somewhere in the lines. A pro will need to find and repair the leak and recharge the refrigerant level to get your A/C back in good working condition.

If you’re dealing with a frozen A/C unit in your Coastal Bend home and need expert help, contact us at CCAC.

Our goal is to help educate our customers in Corpus Christi, Texas about energy and home comfort issues (specific to HVAC systems). For more information about your HVAC system, download our free Home Comfort Guide or call us at 361-678-2495.  

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