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Why is my evaporator coil freezing up?

There are several reasons why an evaporator coil may freeze up:

  1. Restricted airflow: Restricted airflow is one of the most common reasons for an evaporator coil to freeze up. This can be caused by a dirty air filter, blocked ductwork, closed vents, or a malfunctioning blower motor.

  2. Low refrigerant levels: If the refrigerant levels in the system are too low, the pressure in the evaporator coil will drop, causing the coil to freeze up.

  3. Malfunctioning thermostatic expansion valve (TXV): The TXV is responsible for regulating the flow of refrigerant through the evaporator coil. If it is not working properly, it can cause the coil to freeze up.

  4. Malfunctioning defrost control: The defrost control is responsible for initiating the defrost cycle in a heat pump or air conditioner. If it is not working properly, the evaporator coil may freeze up.

  5. Dirty evaporator coil: A dirty evaporator coil can restrict airflow and cause the coil to freeze up.

If your evaporator coil is freezing up, it is important to address the underlying issue in order to prevent damage to your HVAC system. It is recommended to contact a professional HVAC technician to diagnose and fix the issue. Call American Family Heating & Air Conditioning today to diagnose your heating & air problems in Fredericksburg, Spotsylvania or Stafford, Virginia


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