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HomeRepair HelpYork Central A/C RepairYork Central air conditioner coil icing up Repair
York Central air conditioner coil icing up
Is your York central air conditioner coil icing up, or is the evaporator coil frozen? An open humidifier damper is the most likely cause because it lets air bypass the evaporator coil. Set the damper to summer mode or the closed position. Next, check the furnace or air handler blower motor. If the blower wheel does not turn freely, or the motor lacks continuity or power, the motor may have seized and need replacement. A clogged or damaged blower wheel and housing can also restrict airflow and cause the air conditioner to freeze up, so clean the wheel carefully with compressed air or a soft brush. A failed run capacitor or blower capacitor can keep the blower motor from running, producing the same symptom. Less commonly, a faulty thermal expansion valve, or TXV, can mismanage refrigerant flow through the evaporator coil. Enter your York model number to find the exact replacement blower motor, blower wheel, capacitor, or TXV for your unit. Turn off power before inspecting components, and use caution around 240V wiring. Testing or replacing electrical parts may require a qualified technician. Any TXV, refrigerant, or sealed-system repair requires an EPA 608-certified HVAC technician.
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 - York 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 - York 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 - York 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 - York 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 - York 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 York central air conditioner coil freezing up?
Can a blower motor or dirty blower wheel cause my AC coil to freeze?
How do I test a York AC run capacitor when the blower motor is not running?
Could a TXV cause my York central air conditioner to freeze up?
How do I find the correct York AC blower motor, blower wheel, or capacitor replacement part?
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