Check the power to the power outlet and make sure the Frigidaire refrigerator's power cord is plugged into the wall. Visually inspect the cord itself for damages; also check any fuses or circuit breakers to your kitchen. A refrigerator uses a large amount of energy, particularly in the warm months, and the constant compressor activity can cause a breaker to flip.
Listen for the sound of the compressor. If the compressor is running and the refrigerator is not cool, this can be a sign of a coolant leak requiring professional repair. A non-functioning compressor or motor will prevent a refrigerator from becoming cold.
Check the thermostat. Many models of Frigidaire have a thermostat in the refrigerator or on a control panel on the door. Check to see whether the temperature is set low enough and wait to see whether the unit becomes cold.
Run your hand around the refrigerator door seal. If you feel cold air leaking out of the unit, chances are the door seal has deteriorated. This seal can be replaced using a home kit sold at hardware and appliance stores.
Run your hand along the back of the inside of the unit's freezer to check for heat. If you feel a warm spot, this means the unit is in defrost mode. Many Frigidare units have an automatic defrost mode that applies heat to the freezer to remove ice. If your unit has entered defrost mode and will not change back to a normal operating mode, contact a technician.
Check the defrost drain. In models with automatic defrosting features, a small drain sits at the bottom of the unit to collect water. If this drain clogs, water from the defrost cycle can spill over and ice can form in the freezer.