The defrost heater is responsible for melting frost that may accumulate on the evaporator coils. If it fails, frost can build up, impairing the refrigerator’s ability to cool properly. Here’s a step-by-step guide on how to replace the defrost heater.
Caution: Please read our safety information before attempting any testing or repairs.
Important Safety Notice: Before replacing the defrost heater, unplug the refrigerator to avoid an electrical shock hazard.
Tools and Materials Needed
- Screwdriver (Phillips and flat-head)
- Needle-nose pliers
- Putty knife
- Safety gloves
- Replacement defrost heater
- Clean cloth or paper towel
- Rubbing alcohol
Steps to Replace the Defrost Heater
Step 1: Safety First
- Turn Off Power: Unplug the refrigerator to prevent any electrical shock.
- Wear Safety Gear: Wear safety gloves to protect your hands while working.
Step 2: Access the Defrost Heater
- Remove Obstructions: Empty the freezer, and remove the freezer shelves, icemaker, and any other obstructions.
- Remove the Rear Panel: The rear inside panel of the freezer may be held in place by retainer clips or screws. Use a screwdriver to remove the screws or depress the retainer clips with a small screwdriver.
Step 3: Remove the Shelf (if necessary)
- Inspect the Shelf: If you need to remove the shelf, check if any screws must be removed. Use a putty knife to carefully split any seams, and warm the plastic with a warm wet towel to make it more pliable.
- Remove the Shelf: After separating the seams, lift and pull the shelf out of the freezer.
Step 4: Disconnect the Old Heater
- Identify the Heater Type: There are three primary types of defrost heater elements: exposed metal rod, metal rod covered with aluminum tape, or a wire coil inside a glass tube.
- Disconnect the Wires: The heater is connected by two wires with slip-on connectors. Firmly pull the connectors off the terminals using needle-nose pliers if necessary. Do not pull on the wires themselves.
- Inspect for Corrosion: Check the connectors and terminals for corrosion. Replace the connectors if they are corroded.
Step 5: Remove the Old Heater
- Remove Fasteners: Depending on the type of defrost heater, it may be held in place with clips or screws. Remove these fasteners.
- Handle with Care: If your heater has a glass tube, avoid touching it with your bare fingers. Skin oil can cause the heater to burn hot, resulting in damage.
Step 6: Install the New Heater
- Position the New Heater: Place the new defrost heater in the same position as the old one.
- Secure the Heater: Attach the heater using clips or screws as required.
- Reconnect the Wires: Connect the wires to the new heater terminals, ensuring they are securely attached.
Step 7: Reassemble the Freezer
- Replace the Shelf: If you removed the shelf, carefully reinstall it.
- Reattach the Rear Panel: Secure the rear panel with screws or clips.
- Replace Freezer Components: Reinstall the freezer shelves, icemaker, and any other components you removed.
Step 8: Restore Power and Test
- Plug in the Refrigerator: Restore power by plugging the refrigerator back in.
- Test the Refrigerator: Observe the refrigerator to ensure it is cooling properly and that frost is not accumulating.
Tips and Warnings
- Use Proper Tools: Ensure you use the correct tools to avoid damaging components.
- Handle with Care: When handling glass tube elements, be gentle to avoid breakage. Clean any glass elements with rubbing alcohol if touched.
- Consult the Manual: Always refer to your refrigerator’s user manual for specific instructions related to your model.
- Seek Professional Help: If you are unsure about any step or if the problem persists, consider seeking help from a professional technician.
By following these steps, you can effectively replace the defrost heater in your refrigerator, ensuring it operates correctly and efficiently. Regular maintenance and timely repairs will help extend the lifespan of your appliance.
