How do I test a defrost thermostat?

A defrost thermostat can be tested for continuity using a multimeter. At room temperature, it should show an open circuit. When cooled below its activation temperature (usually around 20-30 degrees Fahrenheit), it should show continuity. If it does not switch states, it is likely faulty.

Where is the defrost thermostat located?

The defrost thermostat is typically clipped onto one of the evaporator coils inside the freezer compartment, often behind a removable panel at the back of the freezer. Access usually requires removing freezer shelves and the evaporator cover.

Can a faulty defrost thermostat cause a refrigerator to stop cooling?

Yes, a faulty defrost thermostat can prevent the defrost heater from activating or deactivating correctly. If the heater does not turn on, ice can build up excessively on the evaporator coils, blocking airflow and preventing the refrigerator from cooling properly. If it fails to turn off, it can overheat the freezer.

Refrigerator Defrost Thermostat Replacement

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Dr Quality Parts WR50X10068 Defrost Thermostat for GE Refrigerators

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Compatible with various GE and Hotpoint brand models
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What the WR50X10068 does

The defrost thermostat monitors the evaporator coil temperature and signals the defrost heater to turn on when ice buildup is detected, preventing excessive frost. It then signals the heater to turn off once the ice is melted.

Symptoms when this part fails

Excessive frost buildup on evaporator coils
Refrigerator not cooling sufficiently
Freezer seems warm
Refrigerator runs constantly
Water leaking inside or outside the refrigerator

Compatibility

Fits the GE family. Specifically:

Any unit originally equipped with OEM part number(s): WR50X10068.
Check the model/rating plate inside your appliance and compare it against the fitment table on the product listing before ordering — this guide does not list specific compatible models because Amazon does not provide verified fitment data through this pipeline.

Tools you'll need

Screwdriver set
Nut driver set
Pliers
Wire strippers/crimpers
Multimeter

Difficulty: Moderate · Time: 45-90 minutes

How to install the WR50X10068, step by step

Unplug the refrigerator from its power source.
Empty the freezer compartment and remove shelves.
Locate and remove the evaporator cover panel.
Disconnect the old defrost thermostat wiring.
Carefully remove the old thermostat from the evaporator coil.
Attach the new thermostat to the evaporator coil.
Connect the new thermostat wiring.
Reassemble the evaporator cover and plug in the refrigerator.

Related troubleshooting

If swapping this part doesn't fix the issue, check these next: