If the thermostat in the refrigerator is damaged, it will overcool the refrigerator, resulting in excessive ice buildup. If the defrosting system is not working properly, excessive ice buildup can occur in the refrigerator. If the refrigerator is set at a very cold temperature, it will cause ice to form. Obstruction in the air vents in the refrigerator will create uneven cooling and ice buildup in the refrigerator. Opening the refrigerator door frequently increases the chances of ice buildup. Well, how to prevent ice buildup in the freezer?