It's all built into the control board so if you have a problem with your defrost not turning on, then you need to replace the main control board. LG refrigerators which are that you can buy include only two types of defrost techniques. A defrost timer is usually secured inside a refrigerator with at least one screw, but sometimes more. Leave the doors open and wait at least 8 HOURS for the refrigerator to defrost. The 1st design often is the Adaptive defrost board. During the defrost cycle in a LG refrigerator model LFX21976ST, the defrost sensor tells the main control board the temperature inside the freezer. Your fan should kick in shortly after showing signs that the reset was successful. Ultra Durable 215846602 Refrigerator Defrost Timer Replacement part by Blue Stars- Exact Fit For Friā€¦ Pull it out far enough so that you can disconnect its wires. Your second type of is going to be defrost timer. Make sure to keep towels in and around the unit to soak up any excess water after the frost melts. To reset the refrigerator defrost timer, Tepte simply states to locate the circular notch on the timer and turn it counterclockwise with a flathead screwdriver. When the sensor is defective, the defrost cycle may stop functioning, which ultimately causes the evaporator in the freezer to ice up and the temperature in the fresh food compartment to increase. If the defrost timer is defective, it may not advanc...e into the defrost cycle, or it may not send power to the defrost heater during the defrost cycle. CLICK HERE It needs to be turned until the fan stops, which means your fridge has reset the defrost button. Pull firmly on the wire's connectors to remove them. After 8 hours have passed, use a dry towel to remove any moisture that may be left inside the refrigerator and freezer. Refrigerator Not Cooling - How to Check the Timer - YouTube Remove all the screws you find and pull the timer carefully out of the refrigerator. Defrost Timer The defrost timer turns on the defrost heater several times throughout the day to melt any frost that may have accumulated on the evaporator coils. This is an automated circuit mother board which will regulates the on/off precious time plus frequency in the fridge defrosts time period. Here is a link to the part you'd need to order. there is no defrost timer on this unit, it's part of the control board next to the compressor.

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