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HomeRepair HelpAmana Central A/C RepairAmana Central air conditioner coil icing up Repair
Amana Central air conditioner coil icing up
An Amana central air conditioner with an evaporator coil frozen, ice forming on the refrigerant line, or the entire AC icing over usually has an airflow problem. First, check whether the humidifier damper is open. In summer, it should be closed because an open damper lets air bypass the evaporator coil and can cause the coil to freeze. Next, inspect the blower motor in the furnace or air handler. A failed blower motor or seized bearings can stop air circulation and lead to an air conditioner freezing up. A clogged or damaged blower wheel and housing can also restrict airflow. Less commonly, a failed run capacitor or blower capacitor prevents the motor from running, while a faulty thermal expansion valve, or TXV, can feed the evaporator coil the wrong amount of refrigerant. Turn off cooling and allow an ac coil freezing up condition to thaw before checking airflow. Testing or replacing a capacitor, blower motor, or other electrical part can involve 240-volt power, so disconnect power and use appropriate safety procedures; refrigerant or TXV repairs require an EPA 608-certified HVAC technician. Enter your Amana model number to find the exact 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 - Amana 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 - Amana 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 - Amana 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 - Amana 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 - Amana 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 Amana central air conditioner coil freezing up?
What should I check when my central air conditioner is not cooling and has a frozen coil?
How do I test the blower motor and capacitor when the AC coil is freezing up?
Can a TXV or refrigerant problem cause my Amana air conditioner to ice up?
How do I find the correct replacement part for my Amana central air conditioner?
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