Unlock the Right Part
for Your Repair
Find the exact part you need
Enter your model number to see parts that fit your machine.
Price Match Guarantee
In-stock parts ship the same day
365-Day Return Policy
Price Match GuaranteeChoose Product
Identify Problem
03
Find Solutions
HomeRepair HelpIntertherm Central A/C RepairIntertherm Central air conditioner coil icing up Repair
Intertherm Central air conditioner coil icing up
If your Intertherm central air conditioner coil is freezing up, the evaporator coil may be icing over because too little air is moving through the furnace or air handler. First, check whether the humidifier damper is open; set it to summer mode or the closed position so air cannot bypass the coil. Next, inspect the blower motor, which circulates cooled air through the system. A seized motor, restricted blower wheel and housing, or failed run capacitor or capacitor can stop the blower and cause an evaporator coil frozen condition. Clean dust and debris from the blower wheel carefully, and replace damaged parts. If airflow is normal, a defective thermal expansion valve, or TXV, may be feeding the coil incorrectly. Turn off the air conditioner and allow all ice to melt before testing or replacing parts. Electrical tests and capacitor replacement involve hazardous voltage, so shut off power at the disconnect box and circuit breaker, and hire a qualified technician if you are not equipped for this work. TXV or refrigerant-line repairs require an EPA 608-certified HVAC technician because they involve the sealed system and refrigerant. Enter your Intertherm model number to find the exact replacement part.
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 - Intertherm 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.
Enter model number to search for the required part specific to your product
Highly Likely
03 - Intertherm 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 - Intertherm 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 - Intertherm 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 - Intertherm 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 Intertherm central air conditioner coil freezing up?
What should I check if my air conditioner is not cooling and the evaporator coil is frozen?
How do I test an Intertherm AC run capacitor when the blower motor is not running?
Can a bad TXV cause an Intertherm central air conditioner to freeze up?
How do I find the correct Intertherm central air conditioner replacement part?
Shop by Intertherm Central Air Conditioner Parts
Our Story
Family-owned and operated since 1912, Burke America Parts Group is the longest-running genuine appliance, HVAC, and outdoor power equipment parts solution in North America. At Repair Clinic, we're proud to be an international brand trusted by the pros as well as the DIY community.
About Repair Clinic
© 2026 RepairClinic.com