A warm refrigerator needs quick attention, but it does not always mean the cooling system has failed. First, place an appliance thermometer inside and avoid opening the doors unnecessarily. A refrigerator should generally be kept at 35°F to 38°F. An unopened refrigerator can keep food safe for about four hours during a power outage; perishable food that has been without safe cooling for longer may need to be discarded. Never taste food to decide whether it is safe. Safe chec