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Refrigerator runs constantly

01 - Room Temperature is Hot
Normal operating temperatures for a refrigerator are between 60 and 95 degrees Fahrenheit. The hotter and more humid the air is the less efficient the refrigerator will be, causing it to run more. If possible, keep the refrigerator within the recommended operating temperatures and as cool as possible.
02 - Refrigerator Compressor
The compressor is the component that pumps refrigerant through the sealed system to cool the appliance. If you've determined the fan motors are all working and the thermistor is accurately monitoring the air temperature, it's possible the compressor itself is inefficient, resulting in it running continuously, although this is not a common problem.
Required Part
Refrigerator Compressor
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Common Solution
03 - Freezer Temperature is Above 10 Degrees F (-12C)
On "Top Freezer", "Bottom Freezer", and "Side by Side" models with one evaporator, the freezer temperature should be below 10 degrees Fahrenheit (-12C). Since the refrigerator compartment gets its cold air from the freezer, if the freezer is not cold enough, the refrigerator compartment will take longer to cool down. As a result, the compressor may run constantly. The freezer temperature should be set between 0 and 5 degrees Fahrenheit (-18 to -15C). If the freezer temperature is too high, ensure that the condenser coils are clear of debris and the condenser fan is working properly. In addition, check to see if frost has accumulated on the evaporator coils. If the evaporator coils are frosted over, part of the defrost system has likely failed.
04 - Door Not Fully Closing
Check to see that the doors are closing properly. If a door bin or food item is keeping the door open slightly the refrigerator may not cool properly, which can cause the refrigerator to run constantly
05 - Refrigerator Defrost Heater Assembly
The defrost heater assembly turns on several times throughout the day to melt away any frost that may have accumulated on the evaporator coils. If the defrost heater assembly is defective, the refrigerator will not defrost, and frost will continue to accumulate on the evaporator coils. If the evaporator coils are frosted over, the refrigerator will work harder to remove the heat. As a result, the refrigerator will run constantly in an effort to cool down. To determine if the defrost heater is de...fective, use a multimeter to test it for continuity. If the defrost heater does not have continuity, replace it.
Required Part
Refrigerator Defrost Heater Assembly
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Common Solution
06 - Refrigerator Defrost Thermostat
If the refrigerator runs constantly, the defrost thermostat might be defective. Several times a day the defrost heater turns on for a few minutes to melt away any frost that may have accumulated on the freezer or refrigerator evaporator coils. In order for this to work, the defrost thermostat has to sense that the coils are cold enough. If the coils are cold enough the defrost heater will turn on. If the thermostat is defective it may not be able to sense the temperature of the coils and then wo...n't turn on the defrost heater. If the defrost heater doesn't turn on, the frost will build up on the coils and eventually no air will be able to travel through the coils to provide cooling . The defrost thermostat can be checked for continuity. It should have continuity when it reaches the low temperature of its operating range.
Required Part
Refrigerator Defrost Thermostat
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Common Solution