There are several issues which may prevent your refrigerator from cooling efficiently. A new refrigerator may take up to 24 hours to reach optimal temperature after initial installation. If the refrigerator is still not cool after 24 hours, contact the appliance store or service center where the refrigerator was purchased for assistance. Check the temperature control setting. Most refrigerators allow you to adjust the temperature control settings for the appliance and turn the refrigerator off. If temperature control was turned too high by accident, it might appear as if the refrigerator is not working.