How to Replace a Refrigerator Defrost Control Assembly

 

refrigerator Defrost control assembly PD_0046_795_6615JB2005C

This DIY repair guide shows how to replace the defrost control assembly in some LG and Kenmore refrigerators. The defrost control assembly, located next to the evaporator in the back of the freezer, monitors the evaporator's temperature to protect it from overheating. It includes a defrost temperature sensor, a fuse and a wire harness. If the defrost temperature sensor isn't working correctly, the evaporator overheats during the defrost cycle, which in turn blows the fuse. Less commonly, a shorted defrost heater or faulty wiring could blow the fuse. In both cases, the freezer won't defrost and the electronic display panel shows an error code. Replace the defrost assembly with a manufacturer-approved replacement part if the defrost sensor fails or the fuse blows.

Repair difficulty:
     
Time required:

Less than 120 min.

Parts Required

  • Defrost control assembly

For manuals, repair guides, and specific part recommendations, enter your model number.

Tools Required

  • Phillips screwdriver
  • Slot screwdriver
  • Pliers
  • Work gloves

Before you begin

Wear work gloves to protect your hands. Safely store any food that could deteriorate while the refrigerator is shut off.

Instructions

 Warning: Undertaking repairs to appliances can be hazardous. Use the proper tools and safety equipment noted in the guide and follow all instructions. Do not proceed until you are confident that you understand all of the steps and are capable of completing the repair. Some repairs should only be performed by a qualified technician.

Step 1: Disconnect the electrical power

Unplug the refrigerator or shut off the circuit breaker for the refrigerator. Remove the shelves and baskets from the freezer compartment.

 Tip: Refer to your owner's manual for guidance on how to remove the baskets and shelves from the freezer.

Step 2: Remove the icemaker

If your model has an icemaker in the bottom freezer, unplug the wire harness, remove the mounting screws and pull the icemaker assembly out of the freezer.

Step 3: Remove the freezer drawer and side rail assemblies

If you have a drawer freezer, remove the screws on the outside of the guide rails and pull the door up and out. 

Remove the screws that secure the side rails to the freezer walls and lift the rail assemblies out of the freezer.

Step 4: Remove the back panel

Remove the mounting screws that secure the inside back panel of the freezer compartment.

On some models, Before removing the back panel you must first open the access panel on the top left side and unplug the wire harness for the evaporator fan assembly. You might also have to release the cover of the temperature sensor on the right side and release the sensor from the cover before pulling the cover out.

Pull the bottom of the panel out slightly to release it and then remove the panel from the freezer compartment. 

Step 5: Remove the defrost control assembly

Unplug the wire harness from the defrost control assembly. Use pliers to release the defrost control assembly from the cable ties and pull it out of the freezer. 

Step 6: Install the new defrost control assembly

Insert the new defrost control assembly and secure it with the cable ties. Plug in the wire harness.

Step 7: Reassemble the freezer

Work the panel back into place at the back of the freezer compartment and reinstall the mounting screws.

Reinstall the freezer door and side rail assemblies.

Plug the icemaker into the wire harness and reattach the icemaker to the side wall.

Step 8: Restore electrical power

Reinstall the baskets and shelves in the freezer compartment. Plug in the refrigerator or turn on the house circuit breaker to restore power.