Ice on the external fan: causes, symptoms, and risks

Ice does not only form on the heat exchanger. Under adverse conditions, it can also accumulate around the fan blade or the fan housing.

Possible causes

Refreezing defrost water, inadequate drainage, or snow entering the unit.

Noise, vibrations, reduced airflow, or difficulty starting the fan.

The fan blade may strike the ice, causing mechanical damage.

First, check the drainage, the base pan heater, and correct installation position. Do not attempt to mechanically break the ice on the blades.