Troubleshooting Tips for Frozen Evaporator Coils!


Posted in: Air Conditioning


Frozen evaporator coils are more than just a nuisance. Ignore them and they can shut down your air conditioner or damage the components, leaving you with no cooling in the summer heat. A little troubleshooting at home can save you from that situation. Here’s how!

Correcting Airflow Problems

When airflow through your A/C is restricted, too little warm indoor air passes over the evaporator coils and their temperature can drop below freezing. Take a look at your air filter and replace it if it’s covered in dust. Also, check your air return grates and supply registers to make sure they aren’t caked with debris buildup or blocked by items such as furniture. Keep all your supply registers open.

Inspect the evaporator coils for buildup. Dirty coils can’t absorb heat efficiently, causing the coils to become to cold. After the coils have thawed, you can clean them with a soft brush or foaming coil cleaner. If you find heavy debris buildup or rust, though, schedule a tune-up with America’s Best! We will make sure your system is thoroughly cleaned and ready to run efficiently for you!

Identifying Other Issues

When you find frozen evaporator coils, turn the system off at the breaker and let the coils thaw naturally. This could take up to 24 hours. Avoid picking the ice off because this can damage the delicate coils.

Once you start your A/C again, note how long it runs. It should run until the thermostat temperature is reached, then shut off. If the outdoor unit keeps running, a malfunctioning thermostat could be to blame. Consider replacing yours if it’s old. It’s also possible the outdoor unit has a blown fuse or damaged electrical contactor. Call an air conditioner technician for help with this.

If you’ve noticed a steady drop in cooling capacity, you may have a refrigerant leak. Check your outdoor unit’s copper refrigerant lines for damage, an oily substance or a hissing sound. If you notice any of these or otherwise suspect a leak, contact a technician to prevent more refrigerant from escaping.

For additional tips, tricks, promotions and discounts: Follow us on Facebook by liking our page, or contact us online to be added to our monthly newsletter! You can also subscribe to our Google+ page to keep up and share with all of your connections!


America's Best Mechanical & Electrical Contracting