A lack of refrigerant, filthy coils, or filters that restrict airflow is two causes of ice formation in your air conditioner, leading your AC unit not to blow cold air. To test if increasing the airflow solves the issue, try cleaning the filter and coils on your air conditioner.
If ice accumulates, you’ll need to run the appliance with only the fan to melt it off. If it doesn’t cause the appliance to blow cold air again, the refrigerant levels can be low, and call a professional to resolve this issue on time.