Fridge Defrost heater and thermistor

Fridge Defrost heater and thermistor

The defrost heater and thermistor are critical components of a refrigerator’s defrost system. They work together to ensure that frost and ice buildup on the evaporator coils are properly melted during the defrost cycle, preventing cooling issues in the refrigerator. If you need to replace either the defrost heater or the thermistor, fridge repair follow these general steps:

Safety Precautions:

  • Ensure the refrigerator is unplugged or disconnected from the power source before starting any repair work.
  • Take proper safety precautions, such as wearing safety gloves and protective eyewear.

Tools You May Need:

  • Replacement defrost heater and/or thermistor (make sure they are compatible with your refrigerator model)
  • Screwdriver (Phillips or flathead)
  • Pliers
  • Wire cutters and wire strippers
  • Electrical tape or wire connectors
  • Multimeter (for testing electrical connections)

Replacement Steps:

  1. Access the Defrost Heater and Thermistor:
    • To access these components, you may need to remove the freezer’s rear panel or shelving. Locate the defrost heater, which is typically attached to the evaporator coils, and the thermistor, which is often mounted on or near the coils.
  2. Disconnect the Power:
    • Ensure the refrigerator is unplugged or disconnected from the power source.
  3. Remove the Old Defrost Heater:
    • The defrost heater may be secured with clips or brackets. Carefully remove these fasteners to release the heater. Keep track of any wires connected to it.
  4. Disconnect Electrical Wires (Heater):
    • Disconnect the electrical wires connected to the old defrost heater. These wires may be connected with wire connectors or soldered connections. Use wire cutters and wire strippers as needed.
  5. Remove the Old Thermistor:
    • If you’re also replacing the thermistor, disconnect it from its mounting location and any wires connected to it.
  6. Test the New Components (Optional):
    • Before installing the new defrost heater and thermistor, you can test them using a multimeter to ensure they function correctly. This step is optional but can help identify any issues with the replacements.
  7. Install the New Defrost Heater and Thermistor:
    • Position the new defrost heater and thermistor in the same locations as the old ones. Secure the defrost heater using the same clips, brackets, or fasteners that held the old heater. Mount the thermistor on or near the coils as per the original placement.
  8. Reconnect Electrical Wires (Heater and Thermistor):
    • Reconnect the electrical wires to the new defrost heater and thermistor, ensuring proper connections. Use electrical tape or wire connectors to secure the connections.
  9. Reassemble the Freezer:
    • Put back the freezer’s rear panel, shelving, or any components you removed to access the heater and thermistor.
  10. Plug In and Test:
    • Plug the refrigerator back in or reconnect it to the power source. Turn on the refrigerator and monitor its performance to ensure that it defrosts properly and maintains the desired temperature.
  11. Monitor Operation:
    • Keep an eye on the refrigerator’s cooling performance over the next several hours to ensure that it maintains the desired temperature, and that frost buildup is prevented.

If you’re not comfortable with these steps or if you encounter any difficulties, it’s advisable to seek the assistance of a professional appliance technician to replace the defrost heater and thermistor for you. Additionally, refer to your refrigerator’s manual for specific instructions related to your appliance’s make and model.



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