Why Does My Air Conditioner Keep Freezing Up?

What Causes an Air Conditioner to Freeze Up?

The symptoms of a frozen air conditioning unit can be subtle and hard to recognize , but because the consequences can be so serious, it is important to stay alert to the signs that your system might be sending to you. FrozenHeatPumpRunning a frozen air conditioner without correcting the cause of the freeze-up can potentially lead to irreversible damage to the system’s compressor. That is one important reason every homeowner should be diligent in watching for signs that indicate that the indoor evaporator coil is icing up.

When Your Air Conditioner Freezes Up: The First Signs

The following signs can indicate a freeze-up or other problem with your AC system:

  • Sudden decrease in AC performance
  • Reduced airflow from the system’s vents
  • Unusually large amount of condensate drainage
  • Continuously running system
  • Uncomfortably warm indoor temperature

If you notice any of the above issues, don not wait to investigate. Turn off your air conditioning system immediately. Then proceed with your investigation.

Signs that the Indoor Evaporator Coil is Frozen

During your inspection, you may notice one or more of the following signs that can help confirm your suspicion:

  • Ice buildup on the outdoor refrigerant line
  • Condensation forming on the surface of the indoor air handler
  • Condensation forming on the surface of the condensate drain
  • Unusually large amount of condensate drainage
  • Ice buildup on the evaporator coil inside the air handler

Once you have verified that the evaporator coil is frozen, you will then need to leave the air conditioning system off until the coil thaws. This will generally take several hours. Turning on the fan, without using the air conditioning, can help speed up the process.

After the system has thawed completely, your wisest move would be to call an air conditioning specialist, such as HVAC Philly who serve the greater Philadelphia, Bucks and Montgomery County, PA areas for over 20 years, to inspect the system. Some causes of a frozen coil are more serious or more technical than others. You may need an expert to diagnose and correct the problem.

Common Causes of a Frozen Evaporator Coil

When an air conditioning unit freezes up, a number of issues may be at fault.

Air Flow Issues

The following situations can impede air flow to the evaporator coil in your AC system

  • Dirty air filter
  • Too-small return air ducts
  • Blocked air ducts
  • Closed or blocked registers
  • Malfunctioning fan

Other Potential Problems

The following are several other situations that can cause your AC system to freeze up:

  • Dirty or blocked evaporator coil
  • Blocked drain pipe
  • Refrigerant leak
  • Low outdoor air temperature
  • Too-low nighttime thermostat setting

A refrigerant leak is a serious issue that must be handled by a professional HVAC technician who is certified in the safe handling of AC refrigerant.

If you have any question about the seriousness of this or any other HVAC issue, call the experts at HVAC Philly for prompt service.  Contact us online.  www.hvacphilly.com or call us 215-725-6111

Follow us on FacebookGoogle+TumblrTwitter,or LinkedIn to learn more. HVAC Philly is readily available to answer any questions or to schedule an appointment. www.hvacphilly.com

HVAC Service Provided to

PhiladelphiaSouth Philadelphia FeastervilleBensalemBristolLanghorneYardleyFairless hillsChurchvilleNewtownSouthamptown,  Warminster,  Holland,  Jamison,  MorrisvilleElkins parkCheltenhamGlensideAbingtonHuntingdon valleyWillow grooveHorsham and Jenkintown.


Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )


Connecting to %s