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My Freezer Runs Continuously

It seems like a strange problem. Your freezer is running all the time and won't stop even though you know it should at some point. Ignoring the problem isn't the solution but don't worry. We'll help you find out why your freezer is running continuously and how to fix it. Perhaps there's a problem with the temperature control thermostat or the evaporator fan motor. It could also be the condenser motor. Start by running down the list of frequent causes and after you've figured out the problem, we'll get you the right replacement part and help you make the repair. You'll save money by fixing your freezer yourself and feel the satisfaction of a DIY job well done. Then, you and your freezer can take a well-deserved break.
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Common solutions for: Freezer runs all the time
Solution 1:
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 fre...ezer 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 continuity. 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.
Required Part
Freezer Temperature Control Thermostat
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Solution 2:
Condenser 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 free...ly. 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.
Required Part
Freezer Condenser Fan Motor
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Solution 3:
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 refri...gerator 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.
Required Part
Freezer Evaporator Fan Motor
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Solution 4:
Defrost Heater Assembly
The defrost heater turns on several times throughout the day to melt away any frost that may have accumulated on the freezer evaporator coils. If the defrost heater assembly has burned out, the evapor...ator coils will frost over. If the evaporator coils are frosted over, air won’t be able to pass through the coils and cool the freezer. To compensate for the decrease in cooling capacity, the freezer will run continuously in an attempt to keep the freezer cold. If you suspect that the defrost heater isn’t working, first check the evaporator coils. If the coils are plugged with frost, the defrost system is not working properly. Next, use a multimeter to test the defrost heater for continuity. If the defrost heater does not have continuity, replace it.
Required Part
Freezer Defrost Heater Assembly
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Solution 5:
Defrost Thermostat
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 thermosta...t 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, causing 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.
Required Part
Freezer Defrost Thermostat
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Solution 6:
Defrost Timer
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, fros...t 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 determine 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.
Required Part
Freezer Defrost Timer
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Solution 7:
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 6-12 months. If the condenser coils are dirty, they won’t be able to dissipate heat effectively, greatly reducing the cooling capacity of the freezer. If the condenser coils are dirty or have not been cleaned in a while, clean them.
Solution 8:
Main Control Board
Control boards are often misdiagnosed—before replacing the control board, first check more commonly defective parts. If you have determined that all of the other components are working properly, repla...ce the main control board.
Required Part
Freezer Main Control Board
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Solution 9:
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.