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HomeRepair HelpLuxaire Central A/C RepairLuxaire Central air conditioner coil icing up Repair
Luxaire Central air conditioner coil icing up
When a Luxaire central air conditioner coil is icing up, the evaporator coil may be frozen because air cannot move across it properly or the refrigerant flow is incorrect. Start by checking whether the furnace or air handler humidifier damper is open; it should be in summer mode or closed. Next, inspect the blower motor. A seized motor or blower wheel that does not turn freely can cause an evaporator coil frozen condition. A dirty or damaged blower wheel and housing can also restrict airflow and lead to AC icing over. If the blower motor will not run, a failed run capacitor or capacitor may be responsible. Less commonly, a faulty thermal expansion valve, or TXV, can mismanage refrigerant entering the evaporator coil. Turn off the system and allow the ice to melt before testing or cleaning parts. Disconnect power before inspecting the blower assembly, and have a qualified technician handle 240-volt wiring. TXV replacement and any refrigerant or sealed-system repair require EPA 608 certification. Enter your Luxaire central air conditioner model number to find the exact replacement blower motor, blower wheel, capacitor, or other part for your unit.
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 - Luxaire 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 - Luxaire 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 - Luxaire 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 - Luxaire 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 - Luxaire 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 Luxaire AC coil freezing up?
Could low airflow cause my air conditioner coil to freeze?
How do I test a Luxaire AC run capacitor when the blower motor is not running?
Can a TXV cause my central AC coil to freeze up?
How do I find the correct Luxaire replacement part for my frozen AC coil problem?
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