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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: OEM18040551
Manufacturer Part Number: WP8577274

The Thermistor is an OEM part for Whirlpool brand dryers. It is a temperature-sensing resistor that monitors air temperature changes during the drying cycle. The thermistor provides feedback to the control board on heating element performance and internal air condition. 

Symptoms of a failed thermistor include:

  • Inaccurate temperature readings and selections  
  • Improper or incomplete drying
  • Safety issues from overheating due to lack of feedback
  • Error codes displayed on the control panel

Causes can be related to normal wear and environmental exposure over time. Failure prevents the dryer from achieving optimal drying conditions.

This OEM Whirlpool part can also be used on Maytag, KitchenAid, Jenn-Air, Amana, Magic Chef, Admiral, Norge, Roper, and Kenmore/Sears brand appliances.

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Questions & Answers

For Whirlpool Thermistor (Part Number: OEM18040551)

1 Answer

Richard, These are spring clips that you will use a putty knife to release them. Push the putty knife to the top of them and they should release.

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1 Answer

Hello Kirk, This is most likely the dryer thermistor WP8577274. It should be noted that the ducting from the back of the dryer to outside atmosphere should be checked for a full 4-inch inner diameter with no clogs, crimps, or restrictions.

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1 Answer

Tim, the thermal fuse W10909685 can cause this issue and it can be tested for continuity when the dryer power cord is unplugged. If it does not have continuity, it has failed.

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1 Answer

Amy, it would be recommended that the main control W10802463 is tested for 240VAC from the black wire to the red wire coming from the wire terminal block with a meter. If there is 240VAC, the main control has failed. If there is not, the terminal block would need to be tested to see if voltage is there as this will identify if the voltage issue is in the wiring harness or somewhere else.

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1 Answer

Mark, Check the other thermostats on the unit to make sure that they are good. Check to make sure that there is 120 vac coming from the timer to the motor. If there is power from the timer to the motor then the motor will be the issue.

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1 Answer

Edward, with the power supply cord unplugged, it would be recommended that the thermistor is tested from the main control WP8546219 as this will allow the identification of if the failure is a wire issue or a main control issue. The red wire with a white stripe and the black wire immediately next to it at connection P2 will be used. If the resistance shows the same, the failure is in the main control (unfortunately, the main control has been discontinued and is no longer available). If the resistance shows 0 or OL, the failure is in one of the wires. Unfortunately, the main harness 8299926 has been discontinued but it could possibly be repaired using a hi-temp connector if the wires do not have a loose connection.

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1 Answer

Aaron, With some cycles heating and others not then this would most likely be a faulty main control board that is the problem.

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