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Customer Questions and Answers for Defrost Sensor Assembly by Lg

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Manufacturer Part
4.89 (64)
By: Lg
Part Number: OEM13315440
Manufacturer Part Number: 6615JB2005H

The Defrost Sensor Assembly is an OEM part for LG refrigerators. This integral component plays a key role in monitoring the temperature within the refrigerator's freezer section, particularly during the defrost cycle. It ensures that the defrost system activates and deactivates at appropriate temperatures to maintain efficient operation and prevent frost buildup. 

Symptoms of a faulty defrost sensor assembly include:

  • Excessive frost or ice accumulation in the freezer
  • Refrigerator or freezer section experiencing temperature fluctuations
  • Defrost cycle not running or running too frequently

Causes of defrost sensor failure often involve damage from moisture or ice, electrical faults, or degradation over time, which can lead to inaccurate temperature readings and improper defrost cycle regulation.

This OEM LG part is also compatible with Sears/Kenmore.

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Questions & Answers

For Lg Defrost Sensor Assembly (Part Number: OEM13315440)

1 Answer

Dan, the refrigerator thermistor 6500JB1001K would be the most likely cause of failure and can be tested for resistance to verify this. With the power supply cord unplugged, the two white wires at pin 9 and pin 10 of connection CON4 would be used to perform the resistance check. The resistance should show 8.9K Ohms or more for temperatures colder than 30°F or from 6.2K Ohms to 8.8K Ohms for temperatures between 40°F to 31°F. If the sensor is within either of these ranges in comparison to the temperature of the refrigerator, the main control EBR41956402 has failed. If the sensor is outside of the range in comparison to the temperature, the sensor has failed.

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Mike D for Model Number LMX28987ST

My LG refrigerator model LMX28987ST has a problem that the refrigerator and freezer compartments are not cold. I have replaced the starter relay and checked the compressor and all the fans are working, after watching the video from Appliance Parts Pro I removed the bottom coil cover and found ice freezing around the Defrost Sensor (not on the coil). My question is "Defrost sensor" bad? Part number 6615JB2005H/AP4438477 is correct? Please advice. Thank you, Mike

1 Answer

Mike, If there is ice around the sensor but there is no frost on the coils at all, and the compressor is running, then this will be a sealed system issue and would need to have service.

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Rich for Model Number LFC25770SB

The refrigerator keeps cold but the freezer defrosts to about 40 degrees and then freezes and keeps repeating this process. Door seals are clean and tight, compressor coils are clean and freezer coils are not frozen over. I am guessing I need a defroster temperature sensor. I also can not locate the full model number. Your drop down menu when I enter my model shows an additional number in parentheses such as AWB1LGA, AWB2LGA, etc. These numbers are not, in whole or in part, of any model number, serial number or any other number on the identification plate inside the refrigerator, on the sticker on the bottom left side of the refrigerator, on the back of the unit, on the compressor. Where else do I check?

1 Answer

Rich, Thanks for the question!!! Here would be the correct break down for you model: https://www.appliancepartspros.com/parts-for-lg-lfc25770sb-00.html

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1 Answer

Forest, it would be recommended that the compressor and condenser fan are inspected to identify if they are operating or not. If they are, the condenser coils would need to be checked for dust congestion and cleaned if it is clogged up with dust. If it is not blocked up with dust, the next step would be to check the evaporator to identify if there is a frost pattern at all. If there is not a frost pattern or a partial frost pattern, there may be a sealed system issue. If there is an ice blockage around the evaporator, the defrost sensor 6615JB2005H and heater 5300JK1005K would need to be tested.

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1 Answer

Travis, This issue would most likely be caused by a faulty control board as the sensor could not cause the entire to shut off.

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1 Answer

Ian, it is possible that the sensor has failed. The sensor 6615JB2005C can be tested for resistance and should measure 77KO at -4°F, 60KO at 5°F, and 47.3KO at 14°F. The fuse on the sensor assembly should measure as having continuity and if it does not, then the assembly would need to be replaced. However, the defrost heater 5300JB1100Q should be tested and it should have a resistance reading. If there is not a resistance reading, then the heater has failed and would need to be replaced.

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1 Answer

Nick, That error indicates that you have a problem with the defrost sensor in the refrigerator compartment. Without the model, we are unable to help look up parts for your unit.

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