Normal operating room temperatures for a freezer are between 60° and 95° Fahrenheit (16° and 35° Celsius). The hotter and more humid the air is the less efficient the freezer will be, causing it to run more. If possible, keep the freezer within the recommended operating temperatures and as cool as possible.
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02 - Sealed System Leak
If the freezer only freezes the top shelf, there may be a sealed system leak in one of the shelves. Sealed system repairs are usually cost-prohibitive. If the sealed system is leaking, you will probably need to replace the freezer.
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03 - Temperature Control Thermostat
The temperature control thermostat directs voltage to the compressor, evaporator fan motor, and condenser fan motor. If the temperature control thermostat is not working properly, it can cause the freezer to run continuously. To determine if the thermostat is defective, rotate the thermostat from the lowest setting to the highest setting and listen for a “click.” If you hear a click, the thermostat is not likely defective. If you do not hear a click, use a multimeter to test the thermostat for c...ontinuity. If the contacts inside the thermostat do not open, even at the lowest settings, this indicates that the thermostat is defective. If the temperature control thermostat is defective, replace it.
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04 - Evaporator Fan Motor
The evaporator fan motor draws air over the evaporator coils and circulates it throughout the freezer. On most refrigerators, the fan motor will not run when the door is open. Make sure that the refrigerator door is closed and the door switch is activated. If the door switch is activated but the evaporator fan motor still won’t run, replace the evaporator fan motor.
The condenser fan motor draws air through the condenser and over the condenser coils. If the condenser fan is not running, check the fan blades for obstructions. Next, ensure that the blades spin freely. If the fan blades do not spin freely, the fan motor bearings are worn out, and the fan motor should be replaced. If no obstructions are present, and the fan blades spin freely, use a multimeter to test the fan motor for continuity. If the condenser fan motor does not have continuity, replace it....
The defrost timer turns on the defrost heater several times throughout the day to melt any frost that may have accumulated on the freezer evaporator coils. If the defrost heater does not turn on, frost will continue to accumulate on the evaporator coils, and the coils will eventually frost over. In order for the defrost timer to turn on the defrost heater, the defrost timer must advance into the defrost cycle. If the defrost timer is not advancing properly, the defrost heater won’t turn on. To d...etermine if the timer is defective, slowly turn the timer with a screwdriver or by hand. Turn the timer until it clicks. When the timer clicks, the compressor and fans will shut off. If the defrost thermostat and heater are working properly, the heater will turn on. If the heater turns on, this indicates that the timer is defective and must be replaced.
The defrost heater turns on several times throughout the day to melt away any frost that may have accumulated on the freezer evaporator coils. Before the defrost heater turns on, the defrost thermostat must sense that the evaporator coils are cold enough. If the coils are cold enough, the defrost thermostat will allow the defrost heater to turn on. (Usually, the temperature of the coils must be below 30 degrees Fahrenheit.) If the thermostat is defective, the defrost heater won’t turn on, causin...g the evaporator coils to frost over. To determine if the defrost thermostat is at fault, use a multimeter to test the thermostat for continuity. If the defrost thermostat does not have continuity, replace it.
Check to see that the doors are closing properly. If a door bin or food item is keeping the door open slightly the freezer may not cool properly, which can cause the freezer to run all the time.
Common
09 - Condenser Coils are Dirty
If the condenser coils are located within the freezer walls, the coils do not require cleaning. However, if the condenser coils can be readily accessed from behind or under the unit, you should clean them every 6 to 12 months by using a soft bristle brush (or a dedicated condenser coil cleaning brush) to wipe off the coils in a circular motion. A vacuum cleaner with a nozzle attachment can also be used for hard-to-reach areas.
Common
10 - Sealed System Leak
If the freezer only freezes the top shelf, there may be a sealed system leak in one of the shelves. Sealed system repairs are usually cost-prohibitive. If the sealed system is leaking, you will probably need to replace the freezer.