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HomeRepair HelpGibson Central A/C RepairGibson Central air conditioner coil icing up Repair
Gibson Central air conditioner coil icing up
If your Gibson central air conditioner has a frozen evaporator coil, ice forming on the coil or refrigerant line usually points to restricted airflow or a refrigerant-control problem. The most likely cause is an open humidifier damper, which allows air to bypass the evaporator coil; set the damper to summer mode or the closed position. Next, check the blower motor in the furnace or air handler. A failed motor or seized bearings can stop the airflow needed to prevent an evaporator coil from freezing up. A clogged or damaged blower wheel and housing can also cause weak airflow and 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 motor from running. Less commonly, a defective thermal expansion valve, or TXV, can mismanage refrigerant flow. Turn off power before inspecting components, and understand that capacitor testing and blower-motor replacement involve electrical hazards. TXV, refrigerant, and other sealed-system repairs require an EPA 608-certified, licensed HVAC technician. Enter your Gibson model number to find the exact replacement blower motor, blower wheel, capacitor, or other 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 - Gibson 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 - Gibson 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 - Gibson 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 - Gibson 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 - Gibson 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 Gibson central AC coil freezing up?
What should I check if my AC has low airflow or is not blowing enough air?
How do I troubleshoot a Gibson AC blower motor that is not running?
Can a bad run capacitor cause my AC coil to freeze up?
How do I identify and buy the correct Gibson central AC replacement part?
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