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