Why is there ice on the suction line?

Ice on the suction line of a refrigeration or air conditioning system typically indicates that the system is low on refrigerant, causing the evaporator coil to freeze. This can result from a refrigerant leak or inadequate airflow due to a dirty filter or blocked ducts. When the evaporator coil temperature drops too low, moisture in the air condenses and freezes on the cold suction line. It’s essential to address the underlying issue to prevent further system damage and ensure efficient operation.