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Use this guide to test the defrost thermistor on your LG refrigerator.
This guide will work for most LG refrigerators. This guide is written with an LG model LFX25973 refrigerator. If you have a different model, you may encounter some minor disassembly differences, but the overall repair process will be the same.
The defrost thermistor monitors the temperature of the defrost process and signals the control board when the heat needs to be shut down.
If the defrost thermistor fails, the refrigerator will have trouble defrosting. A couple of error codes could be triggered. These will be displayed on the temperature displays. They may include the dH error if the unit isn't defrosting properly, and the dS error if the sensor is malfunctioning (either short circuit or open circuit).
Replacing the defrost sensor involves splicing wires in the freezer compartment. You can check to see if the connector is not plugged in properly when you check the sensor.
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Unplug your refrigerator before you begin your repair.
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Condenser fan motor
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Compressor motor and thermal overload device
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Water supply valve assembly
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Pull open the freezer door fully.
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Lift and remove the upper pull-out drawer.
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Lift and remove the main drawer bin.
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Use your finger or a flat-blade screwdriver to depress the two locking tabs on the right drawer rail cover.
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Lift the cover off of the rail and remove it.
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Repeat this procedure for the left drawer rail cover.
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Hold the drawer rail cover flush against the side of the drawer rail.
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Push the rail cover straight downward to install. It should click into place.
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Use a Phillips screwdriver to remove the screw securing the drawer to each of the drawer slides.
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Lift the front of the drawer up.
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Pull the drawer toward you to release the drawer from the drawer slides.
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Remove the freezer drawer.
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Use a Phillips screwdriver to remove the screws securing both left drawer slides.
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Pull the upper left drawer slide slightly towards you to release the locking tab at the rear.
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Remove the upper left drawer slide.
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Pull the lower left drawer slide slightly toward you to release the locking tab at the rear.
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Reposition the lower left drawer slide to gain access to the door switch connector.
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Squeeze the door switch connector to release it.
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Pull the door switch connector down to disconnect it.
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Remove the lower left drawer slide.
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Use a Phillips screwdriver to remove the screws securing the ice maker to the top of the freezer compartment.
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Insert a flat-blade screwdriver into the slot located on the right edge of the ice maker.
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Pry outward with the screwdriver to release the locking tab securing the ice maker to the fridge.
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When the tab releases, pull the right front corner of the ice maker down.
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Repeat the previous operation on the left side of the ice maker to release it.
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Grasp the front edge of the ice maker and pull it towards you.
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Lower the ice maker.
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Squeeze the ice maker connector to release it and pull it straight out to disconnect it.
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Remove the ice maker.
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Pinch the rear portion of the air return cover to release it from the freezer wall.
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Pull the air return cover outward and remove it.
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Use a Philips screwdriver to remove the screw (or screws) securing the evaporator cover.
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Grasp the evaporator cover by the air vent openings and pull the top edge toward you.
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Lift the evaporator cover slightly to release the tabs at the lower edge.
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Swing the left edge of the evaporator cover toward you and lower it.
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Disconnect the electrical connections in the upper left corner of the freezer.
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Swing the left edge of the evaporator cover further toward you to access the connections in the upper right corner.
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Squeeze and pull the connector to disconnect the thermistor mounted in the evaporator cover.
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Remove the evaporator cover.
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Trace the two wires of the defrost thermistor to its connector.
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Disconnect the connector and measure the resistance between the two terminals on the connector.
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To reassemble your device, follow these instructions in reverse order.
Take your e-waste to an R2 or e-Stewards certified recycler.
Repair didn’t go as planned? Try some basic troubleshooting, or ask our Answers community for help.
To reassemble your device, follow these instructions in reverse order.
Take your e-waste to an R2 or e-Stewards certified recycler.
Repair didn’t go as planned? Try some basic troubleshooting, or ask our Answers community for help.
