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HomeRepair HelpKenmore Central A/C RepairKenmore Central air conditioner coil icing up Repair
Kenmore Central air conditioner coil icing up
Is your Kenmore central air conditioner has an evaporator coil frozen or showing signs of AC icing over? Restricted airflow is the most likely cause. First, check whether the humidifier damper is open. Set it to summer mode or the closed position so air cannot bypass the evaporator coil. Next, inspect the furnace or air handler blower motor. A failed motor can stop air circulation and cause the air conditioner to freeze up. A clogged or damaged blower wheel and housing can also reduce airflow, while a failed run capacitor or blower capacitor may keep the motor from running. Clean the blower wheel carefully, and turn off power before inspecting electrical components. Testing or replacing a blower motor or capacitor involves line voltage and stored electrical charge, so use proper safety procedures or hire a qualified technician. If airflow is normal, a faulty thermal expansion valve, or TXV, may be feeding too much refrigerant into the evaporator coil. Any refrigerant diagnosis or sealed-system repair requires an EPA 608-certified HVAC technician. Turn off cooling and let the coil thaw before testing. Enter your Kenmore model number to find the exact blower motor, blower wheel, capacitor, or TXV replacement part for your central air conditioner.
01 - Humidifier Damper is Open
An open humidifier damper will let air bypass the evaporator coil. This loss of air flow can cause the evaporator coil to freeze up. If you have a humidifier on your furnace or air handler, confirm the humidifer damper is in the "summer mode" or closed position.
Highly Likely
02 - Kenmore Central Air Conditioner Blower Motor
Since the furnace or air handler blower motor is the component that circulates the air through unit to cool it, a defective blower motor could result in the evaporator coil icing up. You can use a multimeter to test the blower motor for electrical continuity, a continuous electrical path present in the motor, as well as determine if power is reaching the motor. You can also try turning the blower wheel by hand. If the wheel does not turn freely, it's likely the motor bearings have seized and the blower motor will need to be replaced.
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Highly Likely
03 - Kenmore Central Air Conditioner Blower Wheel and Housing
Over time the blower wheel and housing can become clogged with dust and debris. This will restrict the air flow which could result in the evaporator coil icing up. You can try cleaning the blower wheel with compressed air or with a soft bristle brush. Use caution when trying to clean the blower wheel as the fins are sharp and can be easily damaged. If the blower is damaged it will need to be replaced.
Common
04 - Kenmore Central Air Conditioner Run Capacitor
If the run capacitor is defective, the blower fan motor may fail to run which could result in the evaporator coil icing up. To determine if the run capacitor has failed, test the capacitor with a multimeter. If the capacitor is unable to hold and release a charge or is bulging or leaking, replace it.
Common
05 - Kenmore Central Air Conditioner Capacitor
If the capacitor is defective, the blower fan motor may fail to run which could result in the evaporator coil icing up. To determine if the capacitor has failed, test the capacitor with a multimeter. If the capacitor is unable to hold and release a charge or is bulging or leaking, replace it.
Common
06 - Kenmore Central Air Conditioner Thermal Expansion Valve
A thermal expansion valve, commonly referred to as a TXV, regulates the amount of refrigerant in the evaporator coil to help maintain an optimal working temperature.
Common
Frequently Asked Questions
Why is my Kenmore central air conditioner coil freezing up?
What should I check if my AC blower motor is not running?
Can a bad capacitor cause my central air conditioner coil to freeze?
What does a TXV have to do with an evaporator coil freezing up?
How do I find the correct Kenmore central air conditioner blower motor or capacitor?
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