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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

Bill, The elements are either on or they are off, and the temperature is controlled by the oven temperature sensor/probe and/or the oven electronic control. Check the sensor/probe for resistance (1080O @ 70° / 1654O @ 350°), If the element and the probe are good then the issue would be the control.

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Tim for Model Number RBD307PVS00

Control panel is acting up. It will light up for a while, then when I start to cook something the panel will blank out and the oven will shut off. After several hours the panel will light up again. When the panel blanks out, all the buttons still beep but do nothing else. The one exception is the oven light which still comes on. Holding down the clock button for a few seconds yields one beep. Holding down most other buttons yields three beeps. Shutting off the power and back on again at the breaker changes nothing. How do I trouble shoot this? Thanks.

1 Answer

Tim, It would be recommended to test the transformer for the control board to make sure that it is good by testing 120 Vac into the transformer and 24 Vac out of the transformer. If there is proper voltage then also check to make sure that when the oven is set that the cooling fan is coming on and if this is good then the issue will be a faulty control board.

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Ernie for Model Number RBS275PDB14

Our oven was not producing heat. I troubleshot the issue with a digital multi meter to the Thermal Overload Fuse was open. I ordered the replacement part. After installing I turned on the breaker, and both the Broiler and and Bake elements turned on instantly. To measure continuity of the Overload Fuse in the forums I have read two (2) different opinions of Zero Ohms and between 1K and 1,1K. Which is it as I have a device that has 0 Ohms of continuity between the terminals. Is there a second issue with my oven that I have overlooked? Please help. Thank you.

1 Answer

Ernie, The WP9759243 Thermal fuse is a switch(basically) and should be tested for continuity, not resistance. At room temperature/below the temp. rating on the thermostat there should be a "closed" circuit. If the thermal fuse hs failed it would have an "open" circuit at room temperature. Based on your information, once you verify the thermal fuse circuit, you will need to check or replace the EOC/Clock WP8302994. With power removed and the P1 connector removed from the EOC, Check for continuity from P1pin2 black to P1pin4 red then P1pin1orange to pin p1pin2 black, on the control board connector. Both checks should indicate an "open" circuit. If there is continuity on either check the relay on the control board is "stuck" and supplying constant power to the element(s) causing the oven to overheat and the thermal fuse to open.

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1 Answer

Ron, You will want to pull the oven sensor and test the sensor for 1090 ohms of resistance. If the resistance checks ok then it would be likely that the element could be the issue.

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1 Answer

Hello Wade. Based on the information you provided you will want to make sure the touch pad is good. If so, you will need to order and replace the main control board for the unit.

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1 Answer

Rod, They have substituted the thermal overload to another part number but we do not know what design change that was made. You would not want to hard wire past the fuse due to it being a safety device. The part number for the thermal overload is WP9759243.

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1 Answer

Hello Bill, I'm sorry but the manufacturer has not provided this information on this part. Thank you for your patience and understanding in this matter.

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1 Answer

Tim, You want to start at the oven temp. sensor WP4451665. Occasionally, the high heat, extended time, and burnt residue from the self clean cycle will cause the sensor to "loose" it's calibration, and the oven will not operate properly at the higher temperatures.

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