Whirlpool Defrost Thermostat, Sensor

This freezer wire harness links the refrigerator's control system to components inside the freezer compartment. Replacing a compromised harness restores reliable electrical connections and can resolve intermittent or dead freezer functions caused by burned, broken, or corroded wiring.

• Routes power and signals between the control system and freezer components
• Supports proper operation of devices such as the evaporator fan, defrost circuit, lighting, or icemaker
• Replaces cut, heat-damaged, or brittle wiring and loose/oxidized connectors
• Typical symptoms: intermittent cooling, components not running, or visible burned/melted connectors

• Disconnect power to the refrigerator before servicing
• Photograph routing and connections; move wires over one-by-one to the new harness
• Seat connectors fully until locking tabs engage; avoid forcing pins
• Route through original clips/grommets and keep clear of sharp edges, hot surfaces, and moving parts

This defrost bi-metal thermostat monitors evaporator temperature and acts as a safety cutoff for the defrost heater. Replacing a failed thermostat helps prevent frost buildup and restores consistent cooling and defrost performance. What it does:

• Senses evaporator coil temperature and closes when cold to allow defrost heat
• Opens at a safe temperature to terminate the defrost cycle
• Protects the evaporator from overheating during defrost
• Common failure symptoms: heavy frost on the evaporator/back freezer panel, poor airflow, warm refrigerator section, long run times, or the defrost heater not energizing

• 1 defrost bi-metal thermostat

• Disconnect power before servicing; wear cut-resistant gloves
• Access the evaporator behind the freezer's rear panel; thaw ice as needed to reach the thermostat
• Note wire connections and clip location; attach the new thermostat in the same spot, firmly clipped to the evaporator tubing
• Route wiring away from sharp edges and the heater, then restore power and observe operation

This thermistor service kit monitors internal refrigerator temperature and relays it to the control to regulate cooling. The plastic-housed sensor restores accurate readings and steadier temperatures when the original sensor is damaged, out of range, or intermittent.

• Senses compartment or evaporator temperature and sends a resistance signal to the control
• Helps the control manage compressor and fan operation for consistent cooling
• Common signs of a faulty sensor: temperatures too warm/too cold, long run times or short cycling, frost buildup, or thermistor/sensor error codes

• Disconnect power to the appliance before servicing
• Access the sensor location (often behind an interior panel or on the evaporator cover); remove the original sensor/holder
• Install the new sensor in the same position/orientation; route wires away from sharp edges and moving parts; ensure the plastic housing is fully seated
• Restore power and allow up to 24 hours for temperatures to stabilize

Ref Defrost Thermostat L70 Comes With Bracket

This defrost thermostat senses evaporator temperature to control the defrost heater. Replacing a failed thermostat restores proper defrosting, prevents overheating during the defrost cycle, and helps maintain stable cooling performance.

• Monitors evaporator coil temperature and closes to power the defrost heater during defrost
• Opens the heater circuit as the coil warms to terminate defrost and prevent overheating
• Helps clear frost from the evaporator so air can circulate between freezer and refrigerator
• Failure may present as heavy frost/ice buildup, reduced cooling in the fresh food section, the evaporator fan hitting ice, or a defrost cycle that fails to start

• Disconnect power before servicing; defrost heavy ice as needed for access
• Located on/near the evaporator coil behind the freezer's rear panel, typically clipped to tubing
• Match original clip orientation and wire routing; ensure firm thermal contact with the coil/tube
• After installation, confirm operation with a continuity check at freezer temperature or run a manual defrost test per the service manual

This thermostat regulates appliance temperature to help maintain proper heating and cycling for safe, consistent operation. It replaces a failed thermostat to restore correct temperature control and reduce unexpected shutoffs or inconsistent heat. What it does:

• Senses and opens/closes the circuit to control heating elements or compressors
• Can stop heating when the set temperature is reached to prevent overheating
• Commonly used when the appliance won't reach or maintain the correct temperature
• Helps address intermittent heating, continuous running, or overheating symptoms

• Disconnect power before servicing to avoid shock or injury
• Handle thermostat terminals carefully; ensure secure, correct wiring connections

This bimetal defrost thermostat controls the defrost cycle by sensing evaporator temperature to protect the fridge from overcooling during defrost. Replaces a failed thermostat to restore proper defrost operation and temperature control. What it does:

• Opens and closes the defrost circuit based on evaporator temperature to allow timed heater operation
• Prevents the defrost heater from running when the evaporator is already warm
• Commonly used when the freezer is frosting up or the compressor runs excessively during defrost
• Helps maintain consistent cooling by ensuring proper defrost cycles

• Disconnect power to the appliance before attempting any service
• Mount and wire in the original thermostat location; follow OEM wiring and routing for the capillary/sensor
• Inspect the defrost heater and wiring while replacing the thermostat; replace any damaged components

This bimetal defrost thermostat monitors evaporator temperature and helps control the defrost cycle so frost doesn't build up on the evaporator. It replaces a failed thermostat to restore proper defrost operation. What it does:

• Opens or closes the defrost heater circuit based on evaporator temperature
• Prevents the heater from running when the evaporator is warm
• Helps stop excessive frost buildup that can reduce cooling performance
• Common symptom: repeated frost/ice buildup or defrost heater not cycling

• One bimetal defrost thermostat

• Disconnect power to the appliance before servicing
• Access may require removing the evaporator cover or rear panel
• Avoid crushing or bending the sensing element during installation
• After installation, verify defrost operation and wiring connections; test continuity with a multimeter according to service manual procedures