Defrost Thermostat, Sensor

Refrigerator not cooling or frosting up? This defrost thermostat controls when the defrost heater turns off, preventing ice buildup on evaporator coils.

This evaporator wire harness delivers power and control signals to the evaporator fan and defrost components. Replace a damaged harness to restore stable cooling and dependable automatic defrost performance. What it does:

• Provides plug-in electrical connections for evaporator-compartment components
• Carries power and control signals for cooling and defrost cycles
• Enables proper airflow across the evaporator and effective frost removal
• Common clues of a failing harness: heavy frost on the back wall, evaporator fan not running, intermittent cooling, or burned/brittle wires or connectors

• 1 evaporator wire harness assembly

• Disconnect power to the refrigerator before servicing
• Access the harness behind the freezer/evaporator cover; remove drawers/shelves and the rear panel
• If iced over, allow ice to melt—do not use sharp tools on coils or wiring
• Route and secure the new harness exactly like the original; fully seat each connector

Fix a refrigerator that won't cool or frosts excessively with this defrost thermostat. Senses temperature to control the defrost cycle properly.

This thermistor is a temperature-sensing component that monitors conditions inside the refrigerator or freezer compartment. It sends temperature readings to the main control board, which uses that data to regulate the compressor and defrost cycles. Replace this part if your refrigerator is running too warm, too cold, or cycling erratically despite correct thermostat settings.

This thermistor is a temperature sensor that monitors the internal temperature of the refrigerator or freezer compartment and sends readings to the control board. The control board uses this data to regulate the compressor and maintain the correct temperature. Replace this sensor if your unit runs too cold, too warm, or cycles on and off erratically, or if a diagnostic code points to a faulty temperature sensor.

Fixes refrigerator not cooling or excess frost buildup. This defrost thermostat regulates the defrost cycle. DIY-friendly repair, takes about 20 minutes.

Fridge not defrosting or has excessive frost buildup? This defrost thermostat monitors evaporator temperature to control the defrost cycle. 15-minute fix.

Ice buildup in your refrigerator? A faulty defrost thermostat prevents proper defrosting. This bi-metal sensor restores cooling performance quickly.

Freezer working but fridge not cooling? Coils frozen solid? Replace your defrost thermostat. Mounts on evaporator to control defrost heater cycle.

This is a thermostat that monitors the temperature in the ice maker to signal when ice has fully frozen and is ready to be harvested. It acts as a thermal cutoff device to regulate the ice-making cycle. Replace this thermostat if the ice maker stops producing ice, runs continuously without cycling, or fails to eject ice at the proper time.

This defrost thermostat helps control the refrigerator/freezer defrost cycle by sensing evaporator temperature and allowing the heater to run when frost removal is needed. Replaces a failed thermostat to restore normal defrost operation. What it does:

• Closes when the evaporator is cold so the defrost heater can run, then opens when the coil warms to stop defrosting
• Helps prevent excessive frost and ice buildup on the evaporator coil
• Common symptom: visible frost or ice on evaporator, excessive frost buildup, or defrost heater running constantly/ not at all
• Works with the defrost system to maintain efficient cooling performance

• One defrost thermostat

• Disconnect power to the appliance before starting any repair
• Mount on or near the evaporator coil as originally installed; secure wiring away from moving parts
• Inspect the harness and connector for damage; replace if corroded or brittle
• Test for continuity with a multimeter to confirm thermostat function before and after installation

This temperature sensor (thermistor) detects internal appliance temperature and sends readings to the control board so the unit maintains proper cooling. Replacing a failing sensor restores accurate temperature monitoring and helps prevent spoilage. What it does:

• Measures internal temperature and provides a resistance-based signal to the control board
• Helps the control system regulate compressor and defrost cycles
• Commonly causes warm or fluctuating temperatures, prolonged cooling, or temperature-related error codes when failing
• Works as a direct-sensing temperature input — not a user control or switch

• One temperature sensor/thermistor (single part as shown)

• Unplug the appliance or switch off power at the breaker before servicing
• Handle the sensor and its thin leads carefully to avoid damage during removal and installation
• Route and secure wiring so it does not contact moving parts or sharp edges