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Customer Questions and Answers for Thermal Fuse by Whirlpool

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Manufacturer Part
4.89 (64)
By: Whirlpool
Part Number: OEM18042057
Manufacturer Part Number: WP9759243

The Upper Oven Thermal Fuse is an OEM part compatible with Whirlpool double wall ovens. Located near the upper oven heating element, this safety device protects the upper oven cavity from excessive heat rises. If temperatures get too high, the fuse automatically cuts power to prevent overheating.

Symptoms of a blown upper oven thermal fuse include:

  • The upper oven failing to heat or losing total heating function
  • Burning smells emanating from the upper oven cavity
  • Safety shutdown errors related to over-temperature conditions

Common causes are airflow restriction trapping heat or faulty wiring allowing overheating. Natural aging also deteriorates fuses over extended use cycles.

Compatible brands include KitchenAid, Jenn-Air and some Kenmore wall oven models.

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Questions & Answers

For Whirlpool Thermal Fuse (Part Number: OEM18042057)

1 Answer

Hello J., This usually means that one leg of voltage has been dropped. You could have a bad breaker, bad wiring between the breaker and the unit, or a component inside the unit has failed such a thermostat or relay on the board. I would be a lot better assistance with the model number of your unit so I can pull the wiring diagram. This would show me the components in the circuit and enable me to advise you of the test points to properly troubleshoot your unit.

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1 Answer

Boris, You will want to check the oven sensor resistance. The resistance should be approximately 1090 ohms of resistance at room temp of 77 degrees.

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Mattg for Model Number WPRBD245PDS14

Whirlpool/Black Double oven is showing no LED's - Top. Light comes on and all the buttons beep. I have shut it off for 10 minutes - no change. The buttons beep and Light comes on for top/bottom. Once the oven started (without LED) and then it immediately stopped... So, is the control board gone or is it the Thermal fuse on the bottom or the Fuse on the top. Doesn't sound like the control board.. Any help would be appreciated... Thanks, Mattg

1 Answer

Mattg, If the control beeps when you hit the buttons but there is no display then you will want to check the transformer. There should be 120 vac going into the transformer and your test points for the transformer are on the control board Connector P16 pins 5 to 7 for 120 vac. Then check P16 pins 2 to 3 for 12 to 24 vdc. If there is power into the transformer but no power out then the transformer is faulty. If there is no power to the transformer then the control board is the issue.

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1 Answer

Hello Dan. If the thermal overload is bad, you have a 1 year warranty on the part. If it is bad, you may want to look at replacing the oven sensor in the unit as well.

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Scott for Model Number C-970-512121 Kenmore Oven.

I was making something in the oven when I heard a small pop, and it shut down. The elements work great, but the display is completely blacked out (therefore I can not control the oven). There is a white cylindrical "starter" for the light in the oven that has a small scorch mark on it, would that have caused the Thermal Fuse to blow or do you believe the board is fried? My parents are super broke and we're really hoping we can fix this thing, your help is very much appreciated. =)

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