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HomeRepair HelpComfortmaker Central A/C RepairComfortmaker Central air conditioner coil icing up Repair
Comfortmaker Central air conditioner coil icing up
Is your Comfortmaker central air conditioner coil icing up? Shut the system off and let the ice melt before troubleshooting. An open humidifier damper is the most likely cause because it lets air bypass the evaporator coil, reducing airflow; set the damper to summer mode or the closed position. Next, check the blower motor in the furnace or air handler. A failed motor, seized bearings, or a blower wheel that will not turn freely can leave the evaporator coil frozen. A clogged or damaged blower wheel and housing can also restrict airflow and cause AC icing over, so clean the wheel carefully with compressed air or a soft brush. A failed run capacitor or blower capacitor may keep the blower motor from running, leading to an evaporator coil frozen condition. Less commonly, a defective thermal expansion valve, or TXV, can mismanage refrigerant flow and cause the air conditioner to freeze up. Turn off power before inspecting electrical parts, and treat 240V components such as the motor and capacitor as beyond basic DIY work. TXV diagnosis or any refrigerant or sealed-system repair requires an EPA 608-certified HVAC technician. Enter your Comfortmaker 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 - Comfortmaker 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 - Comfortmaker 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 - Comfortmaker 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 - Comfortmaker 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 - Comfortmaker 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 Comfortmaker central AC coil freezing up?
How do I troubleshoot a central AC blower motor when the evaporator coil is frozen?
Can a bad AC capacitor cause the evaporator coil to freeze up?
Could a TXV or refrigerant problem be causing my air conditioner to freeze up?
How do I find the correct Comfortmaker AC replacement part for a frozen coil problem?
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