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Parts by Appliance
Home > Repair Help > Refrigerator/Freezer/Ice Maker Repair Help > Refrigerator is running constantly

Refrigerator is running constantly


The most common parts and conditions which contribute to the symptom "Refrigerator is running constantly" are listed below. Check or test these items and use the available how-to links to learn more. 


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Defrost Heater

The refrigerator defrost heater turns on during the defrost cycle to melt the ice that has formed over the evaporator coils. If the defrost heater is broken, the unit won’t be able to defrost. When this happens, it will continue to operate as though it is in the defrost cycle in efforts to melt away at the ice. Test your defrost heater with a multimeter to determine if it has continuity. If it does not have continuity, then it may need to be replaced.






Defrost Thermostat

The refrigerator defrost thermostat is responsible for taking temperature readings of the evaporator coils to determine when they are cold enough for the cycle to start. If the thermostat is defective, it may take false temperature readings. When this happens, the unit may run constantly to melt away at the ice if it continues to sense the temperature is colder than it actually is. Test your thermostat with a multimeter to check for continuity.






Defrost Timer

The refrigerator defrost timer turns on the defrost heater a few times throughout the day so that it can remove the ice on the coils. If the timer is broken, it may have trouble advancing. As a result, the heater won’t know when to turn on and the unit may continuously run. Check to see that your timer has continuity using a multimeter.







Door Gasket

If your freezer door gasket has become loose or torn, warm air may enter into the unit and cause the coils to freeze over at a faster rate. When this happens, the defrost cycle can’t keep up. This can cause your refrigerator to run constantly. Check your door gasket to see if it is loose or has any tears. If you find an issue with your gasket, replace it.







Warning: Read First!

Attempting to work on appliances that have live energy sources can lead  to serious bodily injury or even death. To prevent such injuries, always remove the appliance from its power source before ...

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