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Customer Questions and Answers for Defrost Thermostat by Ge

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Manufacturer Part
4.89 (64)
By: Ge
Part Number: OEM11390457
Manufacturer Part Number: WR50X10065

The Defrost Thermostat is an OEM part for GE refrigerators. This component is essential in regulating the defrost cycle, ensuring that the refrigerator's evaporator coils do not become frosted over, which can impede airflow and cooling efficiency. The thermostat monitors the temperature of the coils and activates the defrost heater when necessary to melt any accumulated frost.

Symptoms of a failing Defrost Thermostat include:

  • Excessive frost buildup on the evaporator coils
  • The refrigerator or freezer compartments being too warm
  • The refrigerator running continuously without cycling off
  • Water leakage inside the refrigerator due to melting frost
  • Unusual noises as the compressor overworks to maintain temperature

Causes of a bad defrost thermostat can include normal wear and tear over time, exposure to moisture that can cause electrical issues, or a failure in the internal sensing mechanism that prevents accurate temperature regulation.

This GE replacement part is also compatible with Hotpoint, RCA, and some Kenmore models.

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Questions & Answers

For Ge Defrost Thermostat (Part Number: OEM11390457)

Dan for Model Number GE GSH25JFXBWW

I recently asked a question about the defrost thermostat for this GE freezer. I tested a new one before installing it and it would only open when it reached a very high temperature. Since I'm accustomed to similar thermostats opening around 55 F, I thought it was defective. I couild not find the specifications for the replacement thermostat anywhere. I pulled out the old one and found the labeling on it. To my surprise, it was marked 140 F. I see a lot of these GE fridges with defrost problem the same as mine (freezer works fine, but defrost cycle seems to run long and melt the ice....ice cubes are always frozen into a large block). So....here's my question. Is this just poorly designed? would a lower temp thermostat fix this problem? BTW, I've also tested the thermistors; they appear to be good (18K ohm cold with steady decrease to below 3 K ohm when warmed). I hate to spend $150 for a new control board because, based on other customers' experiences I don't have much faith that it will fix the problem. This is driving me crazy. Please help!

1 Answer

Hello Dan, The defrost thermostat is actually an overtemp thermostat. The resistance reading for the thermistor should be at 0 degrees 42.5K ohms, at 37 degrees 14.0K ohms and at 77 degrees 4.92K ohms. Which would mean that when you tested the thermistor WR55X10025 the temp was approximately 30 degrees. You want to check the thermistor from the control board with the thermistor in place with ice around it. This will give you the most accurate reading. Also check your defrost heater WR51X10055 to make sure that it is good. Check it for continuity.

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1 Answer

Hi Tommy. Yes, all the parts you are about to replace will be in the freezer. You have to put your food in laundry baskets with towels on top. They should suffice until your repair is complete.Remove the ice bin first, dump the cubes and turn the bin upside down outside so the water will completely dry. Then shut off the ice maker. With a towel remove the light bulb. Take the shelves out lying them in order to put them back in correctly. Concentrate on the bottom half of the back wall removal. Remove a green ground clip that must be reinserted upon reassembly. The defrost thermostat is on the 5/16" copper line on the rt.upper side. Make sure you clamp it on so the defrost thermostat reads "line" temp. Hope this helps . Thank you.

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Tommy A. for Model Number GSL25JFTABS

As a follow-on to my previous questions on over-thawing in the freezer compartment --- In reading some of the other posts, I see where some of the Motherboards for this model refrigerator require cuting of the Thermistor leads. If my serial number is ZSL..., do I need to cut those leads? My new motherboard did not come with instructions, but it was pretty easy to figure out how it went in. Now, since I did not cut those leads on the new motherboard, I was/am still having the same issue and was told to replace the Thermostat and Temperature sensors that sit in the evaporator area. Problem is, I can not figure out how to get into the compartment where these parts are located. It seems I need to go in through the area just behind the motherboard. I can take out the motherboard, but cannot get the housing into which it mounts to come out. Two big rubber plugs through which the wiring all runs do not want to rotate to release the housing are seemingly the biggest part of the problem. The other problem is the housing just does not seem to want to budge even if I could get the rubber plugs out. It seems to be glued to the refrigerator framework. Do I need a special tool to release the rubber plugs through which the wires all run? Do I need to do something special to un-glue the housing from the refrigerator case? Am I doing it all wrong in the first place??? Tommy

1 Answer

Hi Tommy. You will need to change 2 parts in the freezer area. Pull off the back inner wall and replace these parts. They are what controls the defrost and monitor the temperatures in the cavity. The defrost thermostat is clipped on the incoming sealed system tube above the evaporator. Cut the wire off the old defrost thermostat as close to the device as you can so you will have enough wire to work with. The same as the thermistor. Replace it using(saving) the origional wire cut off close to the device. The defrost thermostat is part # WR50X10065. The thermister is part # WR55X10025. Thank you.

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Tommy A. for Model Number GSL25JFTABS

I have had problems with the freezer defrost system. It comes on and melts down the ice in the ice maker to the extent that when it starts back up again it crates a block of ice that will not move through the ice dispensing system. It even freezes up the auger motor. At your suggestion, I replaced the "Mother Board." NO JOY. Same problem exists. Is there a sensor in the freezer compartment that is causing too much defrosting to occur, or what???? HELP PLEASE! I don't want to spend anothe $100+ on this refrigerator.

1 Answer

Hi tommy. There is also a thermistor on top of the evaporator area that controls tempertaure. This part # is [AP3185407. This part along with the defrost thermostat should be changed together to insure proper temperature sensing. Thank you.

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