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Customer Questions and Answers for Thermistor by Whirlpool

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Manufacturer Part
4.89 (64)
By: Whirlpool
Part Number: OEM18018213
Manufacturer Part Number: WP2188820

The Thermistor is an OEM replacement part for Whirlpool refrigerators. This temperature-sensitive sensor monitors conditions inside refrigerator and freezer compartments. It provides critical feedback to the electronic control module, regulating cool air temperature in both sections.

Symptoms of a faulty thermistor include:

  • Fluctuating temperatures where sections become too warm or cold  
  • Frequent cycling of evaporator fans and cooling components
  • Defrost issues or Er/Ed error codes shown on displays

Causes can involve regular exposure to changing interior environments over many years. Mineral deposits accumulating may lead to sensor surfaces becoming insulated. Physical stress from overloading could potentially crack the thermistor over time as well. 

This OEM replacement part is compatible with some Kenmore Elite models too.

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Questions & Answers

For Whirlpool Thermistor (Part Number: OEM18018213)

1 Answer

Cim, If you open the refrigerator door and look at the upper left side there will be a cover. The thermistor will be next to the damper and you would remove the long flat cover first then the larger vented cover to access.

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Mike Amria for Model Number KSSC48QKS00

Hi: my fridge stopped cooling and the (call service) light and peeping came on immediatley and since then it does not cool at all. I was told the main control board is bad and need to be replaced, so I did but without any results. then I noticed that the evaporator fan motor part # 8201589, and the bi-metal defrost thermostat part # w10225581 is not getting any power through the wires that comes from the main control board, so I checked these wires to see if there is any interruption and found none. Now my question is if the main control board is good and the wires that comes from the main control board to the evaporator fan motor and the bi-metal defrost thermostat have no power even though there is no interruption in these wires, then where is the problem. thank you for looking at my question.

1 Answer

Mike, If there is power coming out of the main control board for the evaporator fan motor but there is no power at the fan then the issue would be that the wiring between the control and the fan are faulty. If you test on the main control board on the P7 connector from Pin 5 Yellow/red wire to Pin 9 White/violet wire there should be 12 vdc. If there is not 12 vdc at this point then you may have received a bad control board if there is power at this point then check the red to white on the fan motor itself to see if there is 12 vdc. If there is then the fan is bad. If there is no power then there is a wiring issue.

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1 Answer

Michael, The thermistor can be located on the side wall of the refrigerator section or behind the crispers. There will be a cover over the thermistor that will have a screw holding it in place.

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1 Answer

Hello Kevin. Test the thermistor for resistance. It should read 10k ohms at 77 degrees, 29,500 ohms at 36 degree, and 86,300 ohms at 0 degrees. Hope this helps you, Thanks!

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1 Answer

Hello Paul. Test the thermistor for resistance. It should read 10k ohms at 77 degrees, 29,500 ohms at 36 degree, and 86,300 ohms at 0 degrees. Hope this helps you, thanks!

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James F for Model Number kssc42fms02

Hello, My refrigerator control panel keeps shutting on and off and I hear the evaporator fan is the freezer do the same. I removed the panel last night and saw that the evaporator motor was turning off and on. But, as time passed I noticed that by having the freezer door open that the temp rose to 40 degrees in the unit. I did not notice anything obvious so I put the panels back on and noticed that the refrigerator started to work normal again and was not shutting off and on. I monitored the refrigerator for an hour and noticed it was still running fine and the freezer and refrigerator were getting cold. I checked the unit again in the morning and saw that it started shutting off and on again. Could this be a Thermistor problem?

Shane for Model Number GC3PHEXNS00

I am wondering if a faulty thermistor might be causing my temperature issue. I set my control board to 37 degrees for the fridge, and my freezer is set to 2 degrees, but control board reads that it's in the 50's for the fridge and 14 degrees for freezer. The actual temperature is way colder and getting below freezing in the fridge. My evap fan is working and constantly running (not sure if that is normal) and air baffle is working. I am hoping it's not the control board though.

1 Answer

Hello Shane. Based on the information you provided, it does sound like the thermistor is bad. However, you can test the thermistor and if it is good, then you will replace the board. Thermistor Temperature Resistance 77°F..................10,000 ohms 36°F..................29,500 ohms 0°F....................86,300 ohms You can test this with a multi-meter TJMA-DMT3. Here is a link on how to use a multi-meter. http://forum.appliancepartspros.com/oven-repair-including-ranges-cooktops/4810-how-check-continuity-ohmmeter.html

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1 Answer

Hello Miguel, The thermistor (AP3757728) should read within 10% above or below 2.7kO at 77°F.

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1 Answer

Hello Dpthomas54. No, you are correct. WP2188820 is the correct thermistor for the model number you provided. Hope this helps.

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