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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

Hello Bob, This sounds like the centrifugal switch on the motor or the winding in the motor has failed. I would list a part, but the model number you posted is not valid. You can call us with the valid model number and we can look it up for you or you can re-post and we can post it on here for you.

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1 Answer

Hello Mark, I would first check the exhaust duct. If it is long and complicated, crimped, or clogged, this can lead up to a failure of this sort. You see, the dryer has to get rid of the heat and moisture or the thermal cutout 279769 will fail and the unit will not heat. If this occurs and the thermal cutout is replaced without correcting the ducting, the thermal cutout will fail again. The main cause of dryer failures is the exhaust duct. Be fore-warned: The thermal cutout comes in a kit with the hi-limit thermostat. This is because the hi-limit thermostat is supposed to open before the thermal cutout. When the thermal cutout fails, this is an indication that the hi-limit thermostat is bad. For this reason, replace them both as per the instructions that come with the new kit.

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1 Answer

Pete, You'll need to recheck the thermal fuse WP3392519 it may have opened and has eliminated the power to the motor, so it won't start. With the repairs you've made so far, the next step would be to test or replace the "user Interface" WP8558753. We'll send you some technical information that should help you out.

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1 Answer

Hello Pete. The thermistor should have an ohms value. It does not read closed for continuity. If the thermal fuse is good, you may have an issue with the door switch WP8283288 on the unit. Also, check and make sure the belt is not broken on the unit. If the belt is broke, the belt switch will prevent the unit from running as well.

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1 Answer

Hello Bob. You will need to test the door switch W10702726 and the fuse WP3392519 on the blower housing. If either is bad, it will prevent the dryer from running. Some models do not use the thermal fuse on the blower housing, you will need to remove the back panel and check your model to see if it has one there. 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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2 Answers

Ben, The thermistor WP8577274 is a mineral based control device. It produces a certain amount of resistance, based on temperature and wether the device is a NTC (negative thermal coefficient) or PTC (positive thermal coefficient). In your dryer it determines the drum temperature, based on the resistance from the drum heat and informs the control board when to cycle the heater off and on. What seems to be the issue ? Thanks and Good Luck

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2 Answers

Hi Ben. Dryer Thermistor - Located on the blower housing next to the thermal fuse. Item Number: WP8577274. At 77° it reads 10,000 ohms. It acts as a cycling thermostat which regulates the heat circuit on/off relay on the main control board. If it does not read within 5- % within spec's , then replace it. Thank You.

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