The preferred temperature for many is between 35°F and 38°F. TEMPERATURE DISPLAY: To change the temperature display from Fahrenheit to Celsius, simultaneously press and hold the FREEZER and REFRIGERATOR buttons for approximately 5 seconds.To convert back to Fahrenheit, repeat the procedure.REEZER TEMPERATURE: Shows the set temperature of the freezer in Celsius (°C) or Fahrenheit (°F). ICE PLUS BUTTON: Pressing this button once will activate the feature and increase both freezing and ice-making capabilities by up to 20%.