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HomeRepair HelpHeil Central A/C RepairHeil Central air conditioner coil icing up Repair
Heil Central air conditioner coil icing up
When your Heil central air conditioner has an evaporator coil frozen, the system may be experiencing restricted airflow or a refrigerant control problem. Start by checking whether the humidifier damper is open; set it to summer mode or the closed position so air does not bypass the evaporator coil. Next, inspect the blower motor in the furnace or air handler. A seized motor or blower wheel that does not turn freely can cause an AC coil freezing up condition. Dust and debris in the blower wheel and housing can also restrict airflow, while a failed run capacitor or blower capacitor can keep the blower motor from running. Less commonly, a faulty thermal expansion valve, or TXV, can send the wrong amount of refrigerant through the coil and cause AC icing over or a frozen AC unit. Turn off power before inspecting components, and use caution because the blower motor, capacitors, and other air-handler parts involve hazardous voltage. Refrigerant diagnosis or TXV replacement requires EPA 608 certification and a licensed HVAC technician. Enter your Heil model number to find the exact replacement blower motor, blower wheel, capacitor, or other part for your specific 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 - Heil 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 - Heil 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 - Heil 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 - Heil 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 - Heil 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 Heil central air conditioner coil freezing up?
Can weak airflow cause my Heil central air conditioner to freeze up?
How do I test the blower motor and capacitor when my AC coil is icing over?
Could a TXV be causing my central air conditioner coil to freeze up?
How do I find the correct Heil central air conditioner replacement part?
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