Whirlpool Refrigerator clip-on bimetal defrost thermostat WP4387503, Replaces 2149641, 2149643, 2163894, 2172694, 2182380, 2183072, 2221677, 4343917, 4387503, 61002113, R0950042, WP4387503VP

Genuine Whirlpool defrost bimetal thermostat that senses evaporator temperature during the defrost cycle and switches the defrost heater off after frost melts. The part is documented for select refrigerators and freezers.

Is This the Right Part?

✅ Cross Reference Information

Common Symptoms

• Frost buildup on the evaporator or freezer interior
• Freezer section too warm when frost restricts airflow
• Refrigerator section too warm because evaporator airflow is reduced
• Refrigerator runs for unusually long periods
• Defrost circuit remains inactive or does not terminate correctly

Check Before Replacing

• Unplug the refrigerator before accessing or testing the thermostat.
• Visually check for heavy frost buildup around the evaporator; frost alone does not prove the thermostat is defective.
• Inspect the thermostat body, clip attachment, wiring, and terminals for visible damage or loose connections.
• With power disconnected and using an appropriate meter, check thermostat continuity at the temperature conditions specified for the appliance service documentation; do not test live voltage unless qualified.
• Confirm that other defrost-system components, including the heater and control, are not being mistaken for a thermostat failure.

Pro Tip

Part Details

Key Features

• Whirlpool genuine OEM defrost bimetal thermostat
• Clip-on evaporator-mounted design
• Cycles the defrost heater off after the evaporator reaches the thermostat’s opening temperature
• Used in refrigerator and freezer defrost circuits
• Non-Wiseable part designation documented by Encompass

Installation Notes

• Disconnect electrical power before installation.
• Wear work gloves when working around the evaporator and internal sheet-metal components.
• Install the replacement in the same evaporator clip location and restore the wiring connection exactly as found.
• Verify that the thermostat is securely clipped to the evaporator tubing and that wiring is clear of sharp edges and moving components.
• Use the appliance’s model-specific service information for access and temperature-testing details.

Verified Compatible Models

10642102300, 10642102301, 10642104300, 10642106300, 10642106301, 10660162990, 10660167990, 10660172990, 10660172991, 10660177990, 10660182000, 10660182001, 10660184001, 10660187000, 10660192000

Fitment reminder: Match the complete appliance model number, including suffix or revision where applicable, before ordering.