A partially frozen evaporator coil can be caused by which issue?

A low refrigerant charge is a common cause of a partially frozen evaporator coil. When the refrigerant charge is low, there is insufficient refrigerant in the system to absorb heat effectively from the air passing over the evaporator coil. As a result, the temperature of the coil drops below the freezing point of water, causing ice to form on the surface of the coil. This ice buildup can severely impair the cooling efficiency of the system, since the frost interferes with heat exchange and reduces the system's ability to draw heat from the indoor air.

In HVAC systems, maintaining the correct refrigerant charge is crucial for optimal performance. A low charge not only leads to freezing issues but can also indicate leaks or other systemic problems that need attention. Identifying and addressing the root cause of the low refrigerant charge is essential for restoring proper function to the cooling system and preventing further complications.