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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: OEM18018210
Manufacturer Part Number: WP2188819

The Thermistor is an OEM part for Whirlpool refrigerators. It plays a critical role in regulating the temperature within the refrigerator and freezer compartments by monitoring and sending temperature readings to the control board, which then adjusts the cooling system accordingly.

Causes of a bad thermistor can include electrical faults, exposure to moisture, or physical damage from mishandling. A faulty thermistor can lead to incorrect temperature readings, causing the refrigerator to overcool or not cool sufficiently.

Symptoms of a bad Thermistor include:

  • Inconsistent temperatures within the refrigerator or freezer
  • The refrigerator running constantly or not at all
  • Spoiled food due to improper cooling
  • Error codes related to temperature regulation

This OEM part is also compatible with Maytag, KitchenAid, Jenn-Air, Amana, Magic Chef, Admiral, Norge, Roper, and Kenmore models.

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Questions & Answers

For Whirlpool Thermistor (Part Number: OEM18018210)

1 Answer

Curt, Check and make sure the refrigerator is level and the rollers/feet are on solid flooring. Check the doors and door seals, make sure they close and seal properly. Check and make sure the ice dispenser door flapper closes and seals properly. Then check the refrigerator shelves and he articles, make sure the articles aren't hanging over the edges of the shelves or against to back or side walls, Check the left side of the top shelf, make sure there's nothing large or bulky blocking or redirecting the air flow from the damper assembly. Then reset the controls to mid range (4 or 5) and let the refrigerator run for 24 hours, with as few door openings as possible. Then use an accurate thermometer and check the temperature it shoul be approximately 37 dgrs. in the refrigerator and 0dgrs. in the freezer(+/- 2 dgrs.) .

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1 Answer

Jerry, With the unit running for only 20 seconds it would be recommended to test to see if there is still power getting to the compressor. It may be a relay failure but sounds like the control board will be the issue.

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1 Answer

Brian, check the thermistors with a multi meter, at 0 degrees it should read 86.300 ohms, at 36 degrees, 29,500 ohms.

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1 Answer

Russell, check for a defrost build-up in the freezer, check the compressor and see if it is running all the time, you may have a sealed system issue.

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Diy for Model Number WRT519SZDW02

My Whirlpool upright top freezer is not cooling or freezing. I cleaned all the coils. All fans are working. The compressor seems to be fine. I have read the resistance on the thermistor from the freezer and get a reading of 2.4 at room temperature and 7.9 in a glass of ice water.. The thermistor from the bottom part of the refrigerator has a reads a resistance of 2.8 at room temperature and 8.1 in the glass of ice water. When I read those wires from both thermistors through the wire harness at the computer board, I do not get any reading at all. My questions are: 1. Are the thermistors good, or do they need replaced? 2. Does the wire harness need to be replaced because I am not getting the same resistance readings?

1 Answer

DIY, Yes, it sounds like the thermistors are OK, as long as there is a resistance reading. The manufacturer did not publish the resistance readings for the thermistors in the tech data sheet or service manual. You can also check for 5 VDC at the CN2 connector on the main control board(across the gray and pink wires). Just be careful doing voltage checks. Yes, you should have the same resistance reading at the control board, as you do at the thermistor. The majority of the wiring harness is located inside the cabinet, and can;t be repaired or replaced, so you'll need to check the connectors and the board control terminals for loose . broken or frayed wires.

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1 Answer

Tk, For this issue if the resistance is 3.5K ohms at 20 degrees then this will be the issue with the unit.

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1 Answer

Hello T.K., The thermistor should read 6.2k ohms at 68°F. It should read 5k ohms at 77°F.

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1 Answer

Alex, This issue would not be caused by the thermistor but would more likely be a wiring issue or a faulty control board.

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