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HomeRepair HelpICP Central A/C RepairICP Central air conditioner coil icing up Repair
ICP Central air conditioner coil icing up
When an Icp central air conditioner has an evaporator coil frozen or the AC coil freezing up, restricted airflow is the most likely cause. First, check whether the humidifier damper is open. Set it to summer mode or the closed position so air cannot bypass the evaporator coil. Next, a failed blower motor in the furnace or air handler may prevent air circulation. A clogged or damaged blower wheel and housing can also reduce airflow enough to cause air conditioner freezing up or AC icing over. Inspect the blower wheel for dust and debris, and check that it turns freely. A failed run capacitor or blower capacitor may keep the blower motor from starting. Less commonly, a defective thermal expansion valve, or TXV, can mis regulate refrigerant flow and freeze the coil. Turn off power before inspecting components, and do not work inside the 240-volt equipment unless you are qualified. TXV, refrigerant, and sealed-system repairs require an EPA 608 certified HVAC technician. Enter your ICP central air conditioner model number to find the exact blower motor, blower wheel, capacitor, or other replacement 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 - ICP 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 - ICP 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 - ICP 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 - ICP 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 - ICP 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 ICP central air conditioner coil freezing up?
What should I check when my AC has low airflow and the evaporator coil is frozen?
Can a bad TXV cause my central AC coil to ice over?
Why is my air conditioner not cooling after the ice melts?
How do I find the correct ICP central air conditioner blower motor or capacitor?
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