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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 Angie. You need to check and make sure there is 240 volts coming to the unit at the terminal block. If not, you will have the issues you are having with the unit.

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1 Answer

Hello Shawn, To test the thermal fuse, disconnect the power supply to the unit and remove the control panel. Reach inside and test from P5-2 (OR) or P5-3 (R) to the red wire at the terminal block. If there is no continuity, the thermal overload is bad and will require replacement to restore normal operation.

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1 Answer

Hello Nathan, You should turn the breaker off and test from P18-4 (R) or PP18-1(R) to the red wire at the terminal block. This test should read a complete circuit, (it should read 25O to 55O). If the unit shows no connection, the thermal fuse has opened. There is a thermal fuse for each oven, so this is most likely the issue.

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1 Answer

Hello Paul, Sounds like a bad selector switch or the thermostat has failed. I would be able to pin it down easier, but the model number you provided does not come up as valid. You should be able to test the switches with the power off with an ohm meter. Re-post with a verified model number and we can go in further in detail.

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1 Answer

Hello Daisy, You need to kill the power to the unit and remove the control panel. Test from P5-2 (OR) or P5-3 (R) to the red wire at the terminal block. This tests through the thermal overload WP9759243. If the unit won't bake or broil, the overload will solve the issue. If it reads good, check the elements.

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Bob M. for Model Number GBD307PDS09

My problem began following a Clean cycle on the Upper. The oven stopped during the cycle, sounded an alarm, and displayed PF. Following that, attempts to use the upper by selecting a baking temp and pressing Start would result in the oven attempting to start (it would turn on for a few seconds), followed by an alarm, then the Control Panel lit up completely, the start up ended with the display presenting PF, the clock going to 12:00 and the upper shut down. The Lower oven worked fine throughout. I replaced Control Board (W10406070) and then encountered a problem with the Control Panel (F2 E1 fault code) (8300440) so I replaced it as well. While this fixed the original problem, now the clock runs fast and the Convection fan runs continuously. Any suggestions?

1 Answer

Hello Bob. Check and see if there is any loose connections inside the unit on the control board. If not, it sounds like the control board you replaced may actually be bad and needs to be replaced.

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1 Answer

Hello Jon, The thermal cutout WP341196 should be located under the control panel. I really have doubts though as I have been studying the wiring diagram and I think the bake element WP9752294 may be the issue. I say this because the diagram shows L1 being broken and this would prevent the broil element from operating properly also. This could also be a control issue. You should check for 120Vac at terminal P11. If you use ground for a test reference, next try P11 to J1-1. J1-1 is neutral. Let us know if you require further assistance.

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1 Answer

Hello Jarod. The only repair is a new control panel for the issue you are having. The problem is the control panel has been permanently discontinued by the manufacturer and we don't know of any source or replacement for the part. Sorry.

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1 Answer

Hello Sir, Open the oven door and look on the inside edge near the bottom on both sides. You will see one screw on each side. Remove the screw and the trim piece that it went through will pull out at the bottom about an inch then it slides straight down. Removing this trim piece on each side will expose the screws that mount the unit to the cabinet. You should use two people to move the unit so you don't get hurt and don't forget to turn off the breaker and verify you turned off the correct breaker. Gloves are strongly recommended also.

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1 Answer

Hello Sir, The thermal overload WP9759243 is located on the back of the unit usually near the top to halfway down the cabinet. The rear cover panel will have to be removed to access it. To test it, using a resistance meter you should read practically no resistance. This is the same as touching the test meter leads together. If it reads no contact at all or a high resistance, it will require replacement.

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