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Customer Questions and Answers for Defrost Control Assembly by Lg

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Manufacturer Part
4.89 (64)
By: Lg
Part Number: OEM18012762
Manufacturer Part Number: ACM73919214

The Defrost Control Assembly is an OEM part for LG refrigerators. It is designed to regulate the defrost cycle, ensuring that frost buildup on the evaporator coils is periodically melted away. This helps maintain efficient cooling performance and prevents excessive ice accumulation, which can hinder the refrigerator's functionality.

You should replace the defrost control assembly if it becomes faulty. Causes of a bad defrost control assembly can include electrical failures, regular wear and tear, or damage from power surges. A malfunctioning defrost control can lead to issues such as inadequate defrosting, which results in excessive frost buildup and affects the cooling efficiency of the refrigerator.

Symptoms of a bad defrost control assembly include:

  • Frost buildup on the evaporator coils
  • The refrigerator not cooling properly
  • The defrost cycle not initiating or running too frequently
  • Increased energy consumption due to the refrigerator working harder to maintain temperature

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

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Questions & Answers

For Lg Defrost Control Assembly (Part Number: OEM18012762)

Russell Dunn for Model Number 795.74043.411

Hello, My unit was made (per label) in March 2015. The fridge is not cooling at all (about room temp) and the freezer is 45 degrees. I've replaced the overload assembly, and the control board. There is no ice buildup behind the wall in the freezer section. There are no error codes on the display. The compressor hums with no clicks or rattles. There is a yellow DRY powder in the drip pan. All fans are running. Would someone please point me in a new direction? Thanks, Russ

1 Answer

Russell, If the unit has frost on the rear wall then you will want to pull the rear wall and check for the coils being impacted with ice. It sounds like you have a defrost problem in which you will need to test the heater and the defrot sensor and thermal to make sure that they are good. If they are then the issue will be with the main control board.

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1 Answer

Matt, It may not be the control board but the sensor for the defrost that is faulty. It would be recommended to test this sensor for resistance and the fuse for continuity. If the fuse does not have continuity then you would need to replace the assembly 6615JB2005R. If the resistance is off with the sensor then the assembly will need to be replaced. If both check ok then check the heater to make sure that it is good. If it is good then the main control board will be the issue.the only difference between the 2 parts is one is for the refrigerator and the other for the freezer.

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Maurice for Model Number 79574023412

i have a kenmore elite model number 795.74023.412 i have replaced the capacitor the thermistor and the pcb board my problem is i cant get fridge to cool down all the way like it should its about 7 degrees off it wont hold temp it goes up and down fridge and freezer are doing the same thing fridge about 45 and freezer at about 5 degrees it acts to me like it dont come on when it should but when it does it cools off pretty quick to around 40 i cant get it down to 33 or any colder then 40 seems like when the door is opened it triggers fridge to cool i think maybe it gets stuck in defrost mode any ideas on which way to direct me would be greatly appreciated

1 Answer

Hello Maurice, based on your description of the symptoms and the parts you have replaced (the main control board ) it is likely this point to be a compressor or sealed system problem.

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Pavel for Model Number Kenmore 795.79993510

Both the fridge and freezer are not cooling enough. I opened the back of the freezer and found ice on the Evaporator Assembly. I thought that the problem may be in the Defrost Control Assembly, but the compressor is running non-stop and it is very hot (my understanding is that it should be off during the defrost cycle). I checked the Defrost Control Assembly (0 ohm on red, 14.5k ohms on orange) and both Heaters around the Evaporator Assembly (66 and 155 ohms). How can I diagnose what is the issue here? Is the culprit the main control board? Thank you.

1 Answer

Hello Pavel, the compressor is controlled by an inverter circuit, it and the defrost circuit are part of the main control board. This ref has dual evap coils, a defrost problem on one will not affect the other. Likely the ref is running a lot to try to cool each compartment to the correct set temp. This sounds like a sealed system problem rather than a control board problem.

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Stan for Model Number LFX33975ST/03

Hello. I need some help to find the problem I have water in the fridge part of my LG Fridge.LFX33975ST/03 I opened the back panel inside the fridge and there was ice at the bottom of the tray. the drain pipe was frozen.water was going inside. Should I try to change the defrost control module#AP6004251 red wire sensor is reading 0hms the orange11.7kohms Is this O.K Or there is something else. The heater element has 82ohms I have already cleaned the pipe a month ago. But the problem is coming back. Thank you for your help. Stan

1 Answer

Stan, as the drain hole is clogged up, it is likely that the drain tube 5251JA2006B at the compressor section is sticking closed and would need to be replaced.

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Joe W. for Model Number LFXS30726S

I'm losing my mind trying to figure out why my LG french door refrigerator isn't getting cold enough. The freezer isn't either. Initially, I opening up the bottom rear panel and vacuumed out the condenser coils and vent louver. They were covered in very thick dust and dirt. The condenser fan was working when the compressor was running. I let it run overnight but it is still not cold enough. I decided to replace the evaporator fan in the freezer. I checked continuity of the old one and noticed it only had continuity while I manually turned the motor shaft so I figured that should be the problem. It still doesn't seem to be getting to the proper temperature. Should I replace the temperature sensor in the freezer? Does that second evaporator fan push just push air up into the door for the ice maker? When I replaced the motor there was a fine even layer of frost across the entire evaporator coil so I didn't think there were any issues there. I'll let it run overnight but I'm losing hope.

1 Answer

Hello Joe, If you could post a new question and include an e-mail address we can send you the troubleshooting section of the service guide to aid you in your repair.

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1 Answer

Frankie, The first step in figuring this unit out would be to remove the rear wall and check to make sure that there is a frost pattern on the evaporator coils. The fan does not run when the doors are open. If there is ice completely covering and blocking air flow then this would be a defrost issue in which you would need to test the evaporator sensor, defrost heater and if they are ok then will be a faulty control board. If there is no frost pattern at all then this would be a sealed system issue in which you would need to have service to repair. If the frost pattern is full even frost pattern top to bottom then this would be a normal frost pattern and would need to test to see if the control board is sending power to the fan to run. If it is then replace the fan if it does not run.

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1 Answer

Eric, The coils in the freezer being frozen would be a issue with the defrost system. You will want to check the heater and the controller assembly to make sure they have continuity. If they check ok then the issue will be the main control board. The fan motor would most likely not be the issue with this unit.

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