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HomeRepair HelpColeman Central A/C RepairColeman Central air conditioner coil icing up Repair
Coleman Central air conditioner coil icing up
When a Coleman central air conditioner has a frozen evaporator coil, the system may be experiencing restricted airflow or a refrigerant-control problem. Start with the most likely cause: an open humidifier damper can let air bypass the coil, so set the furnace or air handler damper to summer mode or closed. Next, check the blower motor. A failed blower motor can stop air circulation, while a seized motor may not turn the blower wheel freely. A clogged or damaged blower wheel and housing can also restrict airflow and cause your AC coil to freeze up. If the blower motor does not run, a failed run capacitor or capacitor may be responsible; bulging or leaking capacitors should be replaced. A defective thermal expansion valve, or TXV, can also cause the evaporator coil to ice over by misregulating refrigerant. Turn off power before inspecting or cleaning components, and treat 240V wiring and capacitors as beyond basic DIY work. TXV and other sealed-system repairs require an EPA 608-certified HVAC technician. Enter your model number to find the exact Coleman 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 - Coleman 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 - Coleman 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 - Coleman 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 - Coleman 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 - Coleman 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 Coleman central air conditioner coil freezing up?
What should I check if my air conditioner has low airflow and the evaporator coil is frozen?
Can a bad capacitor cause my central AC coil to freeze up?
What if my Coleman evaporator coil keeps freezing after I fix the airflow?
How do I identify the correct Coleman central air conditioner replacement part?
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