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HomeRepair HelpGarrison Central A/C RepairGarrison Central air conditioner coil icing up Repair
Garrison Central air conditioner coil icing up
If your Garrison central air conditioner coil is icing up, the evaporator coil may be freezing because airflow is restricted or the refrigerant system is not regulating correctly. Start by checking whether the furnace or air handler humidifier damper is open. Set it to summer mode or the closed position so air does not bypass the coil. Next, inspect the blower motor. A failed motor, seized bearings, or a blower wheel that does not turn freely can cause an ac coil to freeze up. A clogged blower wheel and housing can also reduce airflow enough to create an evaporator coil frozen condition, so clean the wheel carefully with compressed air or a soft brush. If the blower motor will not run, a failed run capacitor or capacitor may be responsible, but capacitor testing and replacement involve stored electrical energy and should be handled cautiously. A defective thermal expansion valve, or TXV, can also cause air conditioner freezing by misregulating refrigerant. Turn off the system and let the ice melt before testing, and have an EPA 608-certified HVAC technician handle any refrigerant or sealed-system repair. Enter your Garrison model number to find the exact blower motor, blower wheel, capacitor, or TXV 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 - Garrison 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 - Garrison 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 - Garrison 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 - Garrison 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 - Garrison 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 Garrison central AC coil freezing up?
What should I check if my AC blower motor is not running and the evaporator coil is frozen?
Can a dirty blower wheel cause my central air conditioner to ice up?
Could a bad capacitor or TXV cause my AC coil to freeze?
How do I identify the correct Garrison central air conditioner replacement part?
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