When a refrigerator starts working improperly there is a need for a complex diagnostic. Most likely the appliance is suffering from several breakdowns and some parts may need replacement in order to return to normal functioning. Check your main electrical panel for a flipped breaker and switch it back on if necessary. Thermostat dials inside the fridge can get bumped by cartons of milk or other items, though, which can change the set temperature. Check the refrigerator’s thermostat. Clean a drain line, it is often clogged. A defrost sensor can hamper efficiency when it is broken, replace it if needed. Install a heater extension. In case when you search for additional help to make sure everything works normally and all the parts are in good condition, call for a professional tech service for help.