How do I test a defrost thermostat?

Use a multimeter to check for continuity. A bimetal defrost thermostat should show continuity when cold (below freezing) and open when warm (above freezing). If it fails to show continuity when cold or remains open when cold, it is likely faulty. Always disconnect power before testing any electrical component.

Where is the defrost thermostat located?

The defrost thermostat is typically clipped onto one of the evaporator coil tubes inside the freezer compartment. You usually need to remove the freezer's rear panel or sometimes the floor panel to access the evaporator coils and the thermostat's location.

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

Yes, if the defrost thermostat fails to activate the defrost heater, excessive frost can build up on the evaporator coils. This frost can block airflow and prevent the refrigerator from cooling effectively, even if the compressor is running normally. This often leads to a warm fresh food compartment.

Refrigerator Defrost Thermostat Replacement

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🏆 RECOMMENDED PART

Refrigerator Defrost Thermostat W10225581, 2 Pcs Bimetal Defrost Thermostat Exact use for Whirlpool, Sears, Kenmore Refrigerator: Replace

MODEL NUMBER: Refrigerator Defrost Thermostat W10225581
EASY TO INSTALL: It is made exactly fit for most top name brands (Whirlpool, Kenmore, KitchenAid, Maytag), and replaces part numbers: PS11750673, AH2376801, EA2376801, PS2376801,AP6017375, 2149849, 2161331, 2176066, 2...
PREMIUM QUALITY: The replacement part is made from durable high quality material and well-tested by the manufacturer - Meet OEM standards - Ensure long lasting and effective operation. The function of the defrost bi-m...
SAVE TIME & MONEY- Easily and quickly repair or fix your freezer
100% AFTER SALES SERVICE: ustomer satisfaction is our priority. If for any reason you're not completely satisfied, you can ask for a replacement, no questions asked. Buy with confidence!

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What the W10225581 does

The defrost thermostat monitors the temperature of the evaporator coils and signals the defrost heater to activate when the coils are too cold. It prevents the defrost heater from overheating the freezer compartment by breaking the circuit once the ice has melted.

Symptoms when this part fails

Excessive frost buildup on evaporator coils
Freezer is cold but refrigerator section is warm
Refrigerator runs constantly without cycling off
Water pooling inside or outside the refrigerator
Defrost heater not activating or running too long

Compatibility

Fits the Whirlpool family. Specifically:

Any unit originally equipped with OEM part number(s): PS11750673, AH2376801, EA2376801, PS2376801, AP6017375, 2149849, 2161331, 2176066.
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.

Also replaces: PS11750673, AH2376801, EA2376801, PS2376801, AP6017375, 2149849, 2161331, 2176066

Tools you'll need

Screwdriver set
Nut driver set
Wire strippers/crimpers (if needed)
Multimeter

Difficulty: Moderate · Time: 45-90 minutes

How to install the W10225581, step by step

Unplug the refrigerator from the power outlet.
Remove the freezer back panel to access the evaporator coil.
Locate the defrost thermostat clipped to the evaporator coil tubing.
Disconnect the electrical connectors from the old thermostat.
Remove the old thermostat clip from the coil.
Attach the new thermostat to the evaporator coil tubing.
Connect the electrical connectors to the new thermostat.
Reinstall the freezer back panel and restore power.

Related troubleshooting

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