* Low refrigerant charge: If the heat pump is low on refrigerant, it will not be able to transfer heat effectively, which can cause the outdoor unit to freeze up.
* Dirty coils: The coils on the outdoor unit can become dirty over time, which can block airflow and cause the unit to freeze up.
* Faulty expansion valve: The expansion valve regulates the flow of refrigerant into the evaporator coil. If the expansion valve is faulty, it can cause the evaporator coil to become too cold and freeze up.
* Faulty reversing valve: The reversing valve changes the direction of the refrigerant flow to switch between heating and cooling modes. If the reversing valve is faulty, it can cause the outdoor unit to freeze up in heating mode.
If your Airwell heat pump outside unit is freezing up, it is important to have it diagnosed by a qualified technician to determine the cause of the problem and have it repaired.
