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Bryant Air Conditioner Coils Freezing

The part(s) or condition(s) listed below for the symptom Air conditioner coils freezing are ordered from most likely to least likely to occur. Check or test each item, starting with the items at the top of the page.

Most Frequent Causes for Air conditioner coils freezing

For the most accurate results, enter your model number.


Cause 1Dirty Air Filter

If the air filter becomes clogged with dirt, it restricts airflow over the evaporator coils. If the airflow is reduced, the evaporator coils get too cold, which then causes the humidity in the room to condense on the coils and freeze. As frost accumulates on the coils, the frost restricts the airflow even more. Eventually, the entire evaporator coil assembly will frost over, causing the airflow to be completely restricted. If the air filter is dirty, replace it.

Cause 2Sealed System Leak

If the air conditioner coils are freezing in only one area, there may be a sealed system (or refrigerant) leak. This is normally a very expensive repair. Repairs to the sealed system must only be performed by a licensed technician.

Cause 3Dirty Evaporator Coil

Proper air flow is critical for the air conditioner to work properly. The evaporator needs sufficient air flow to keep the condensing water from freezing. If the evaporator coil, air filter or blower wheel gets clogged, air flow will be reduced and ice can start forming on the evaporator coils, eventually freezing them up. It is recommended to replace the air filter at least every 6 months or sooner depending on the conditions.

Cause 4Dual Shaft Fan Motor

An air conditioner dual shaft fan motor is the component that spins the fan blade and blower wheel to both draw air into the unit and force it through the front vent and out the rear condenser coil. If the fan motor is burned out, the air won't be circulated which can cause the coils to freeze and the condenser and compressor to overheat. You can use a multimeter to determine if power is reaching the fan motor. If power is reaching the motor, but it doesn't run, the component will need to be replaced.

Parts
Cause 5Air Filter

Air Filter

Parts
Cause 6Fan Motor

An air conditioner fan motor is the component that spins the fan blade or blower wheel to circulate the air. If one of the fan motors is burned out, the air won't be circulated properly which can cause the coils to freeze. You can use a multimeter to determine if power is reaching the fan motor. If power is reaching the motor, but it doesn't run, the component will need to be replaced.

Parts
Cause 7Blower Motor

Parts
Cause 8Temperature Set Too Low

If the temperature is set too low the air flow across the evaporator coil may not be warm enough to keep the condensing water from freezing on the coil. It is recommended to keep the set temperature at 68 degrees Fahrenheit (20 degrees Celsius) or above.