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HomeRepair HelpGoodman Central A/C RepairGoodman Central air conditioner coil icing up Repair
Goodman Central air conditioner coil icing up
When your Goodman central air conditioner coil is icing up, the evaporator coil is freezing because airflow or refrigerant control is out of balance. The most likely cause is an open humidifier damper, which lets air bypass the coil; set the damper to summer mode or the closed position. Next, check for a failing blower motor in the furnace or air handler. A seized motor can stop the blower wheel, while a clogged or damaged blower wheel and housing can restrict airflow and cause an evaporator coil frozen condition. A failed run capacitor or blower capacitor can also keep the blower motor from running. Less commonly, a faulty thermal expansion valve, or TXV, can feed the evaporator coil the wrong amount of refrigerant and cause your air conditioner to freeze up or experience ac icing over. Turn off electrical power before inspecting accessible components, and do not work on 240V wiring, capacitors, the TXV, or the sealed refrigerant system unless qualified. Refrigerant handling requires EPA 608 certification and should be performed by a licensed HVAC technician. Enter your Goodman model number to find the exact blower motor, blower wheel, capacitor, or other 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 - Goodman 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 - Goodman 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 - Goodman 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 - Goodman 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 - Goodman 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 Goodman central AC coil freezing up?
What should I check if my air conditioner has low airflow and the evaporator coil is icing over?
How do I test a Goodman blower motor or run capacitor when the condenser coil is freezing?
Can a TXV cause my Goodman air conditioner to freeze up?
How do I find the right Goodman central AC blower motor or capacitor replacement part?
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