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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

Jim, Check the frost pattern of the evaporator coils. There should be an even frost pattern from top to bottom. If the frost pattern is only partial then the issue would be either a sealed system leak or a restriction in the sealed system.

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1 Answer

Ken, With the issue that you are having with the layer of ice at the bottom of the freezer would be caused by a clogged drain. You would want to clear all the ice out and flush the drain with hot water to clear.

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Matt for Model Number GD5SHAXNB00

I have Whirlpool side by side refrigerator (model # GD5SHAXNB00) that was given to me after it had been working on and off and eventually replaced. After researching I learned that it was common for the OEM control board to burn out if a light bulb burned out. I checked that and found a transistor and pathway that had burned out. It has now been replaced, but is still not cooling sufficiently. The compressor runs, I cleaned the condenser coils, there's no ice buildup in the freezer, and the air ducts are clear (although the air diffuser assembly part # AP4327308 is broken I can manually adjust it). When plugged in the evaporator coil only frosts down the first expansion tube down to the bottom of the coil but does not frost beyond the first bend. I removed the thermistor and tested it with a multimeter and observed the following; room temp 3.72k ohms, ice water 8.79k ohms. I read elsewhere, but for a different brand, that it should read something closer to 6.2 and 16.3 k ohms respectively. Do those numbers also apply to my whirlpool indicating I need a new one? Also, there's been twice that I noticed after unplugging the unit a couple of bubbles form from under the shrink tubing where the expansion tubing first connects to the evaporator coil pack. Is this possibly a coolant leak, or maybe just air under the shrink tubing expanding and bubbling out? Basically, how do I tell it it's an actual coolant leak? Thanks for your help!

1 Answer

Hello Matt. Either it is restricted or there is a leak. You will need HVAC gauges to read the pressures on the system to find the problem.

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1 Answer

Hello Jason. It could be the thermostat. However, I would check the condenser fan motor and coils and make sure they are clean and removing the heat as they should.

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Scott for Model Number Whirlpool GS5SHAXNT00

My freezer coils keep icing over. I have replaced the bimetal sensor and the heater element. Still icing. I disconnected the element at one end, took a voltage reading at the end of the element with a fluke digital meter, and got 64 volts between the open connectors. I took a reading from the element end to the fan ground and got 64 volts. Shouldn't the heating element be getting 115 volts to properly melt the ice? Could the thermistor be bad? Is there a defrost thermostat in this refrigerator or is it integrated into the board?

1 Answer

Hello Scott. If the unit is in defrost cycle, the heater should have 120 volts coming to it.

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Matt for Model Number kenmore 106.56702500

My refrigerator section keeps warming up. The freezer stays frozen. My kids turned down the refrigerator section to 33°f so I unplugged thew whole unit for 36 hours and let it all thaw with doors open. plugged it back in, set temp to correct 37° and a little more than 12 hours later it was good to go. 4 days later inside fridge was warm again.(last night) This morning it was cooled off again, but not where it should be. Is this a thermistor problem since the freezer works just fine? What else should I check?

1 Answer

Hello Matt. It sounds like you may have a defrost problem with the unit. Check and see if there is any frost build up on the back wall of the freezer. If so, you will need to test the defrost heater and the defrost thermostat. They should read closed for continuity when cold. You can test this with a multi-meter TJMA-DMT3. I will include a link at the end to assist you how to use the multi-meter if needed. If both parts are good, you will need to replace the defrost timer. Once the problem is repaired, you will need to thaw out the ice on the coils before the unit will operate properly. http://forum.appliancepartspros.com/oven-repair-including-ranges-cooktops/4810-how-check-continuity-ohmmeter.html

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Pete for Model Number kenmore 106.53352300

Hi, Fridge has developed an intermittent issue with temp control. At times the freezer temp is way to cold. When set at normal mid-range setting it can be as cold as -20F. During these times the refrigerator section is also below normal..below 32F in the bottom sections. The temp difference between the freezer and refrigerator seems about right so I don't think it's a damper problem. My guess is a thermostat (thermistor??) problem. Please give short explanation of function of temp control and your suggestion of problem. How to test? I saw a 2.7K ohm @ room temp spec in another answer, is that for this thermistor? Thanks

1 Answer

Pete, You will want to check the thermistors of the unit as this may be a bad thermistor WP2188819. You can test the thermistors by removing from unit and letting them warm to room temp. At 77 degrees the resistance should be 2.7K ohms. If the thermistors are not reading the proper resistance then they are defective. If the thermistors check ok then the control 8201527is faulty and would need to be replaced. 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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