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Customer Questions and Answers for Magnetron Assembly (Microwave) by Whirlpool

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Manufacturer Part
4.89 (64)
By: Whirlpool
Part Number: OEM18046170
Manufacturer Part Number: WPW10126786

This microwave magnetron generates the RF energy that heats food. If your unit runs but won't heat—or makes a loud hum—the magnetron may be at fault. Replace this assembly to restore dependable heating.

  • Produces microwave energy as part of the high-voltage system to heat food
  • Typical failure symptom: runs but does not heat
  • Loud humming or buzzing during a cook cycle
  • Burning smell, arcing, or scorch marks near the waveguide/magnetron
  • Trips the breaker or blows an internal fuse at start when shorted
What's included: 1 magnetron assembly Installation notes:
  • Disconnect power before service; the high-voltage capacitor can retain a dangerous charge—discharge it properly
  • Note wire orientation and mounting; transfer any original brackets/insulators as required; install in the same orientation
  • Handle by the body only; do not touch or chip the ceramic antenna
  • Inspect the waveguide and cavity cover for signs of arcing and correct any damage before use
Before you buy: No-heat can also be caused by the high-voltage diode, capacitor, transformer, or door switches. Diagnose to ensure the magnetron is the failed component.

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Questions & Answers

For Whirlpool Magnetron Assembly (Microwave) (Part Number: OEM18046170)

1 Answer

Hello Roland! No, I'm sorry. The microwave will have to be removed from the cabinet. Thanks.

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1 Answer

Gerald, You will need to test the magnetron. The resistance value should be .5 ohms resistance. Also you will want to check the diode to make sure that it is good.

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1 Answer

Joe, The diode, if bad would not work at all. You would want to replace magnetron but it is not necessary to replace diode.

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1 Answer

Marvin, Like any "OTR" microwave, the hardest part is getting to the components, You basically have to un install the product and work on it, on a table or counter top. We'll be sending you some information that should be helpful. Thanks

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1 Answer

Hello Ross. Yes, it could still be the magnetron WPW10126786. Unplug the magnetron and see if the problem continues. If not, replace the magnetron and diode. Hope this helps.

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1 Answer

Hello Louie. Once you access the magnetron WPW10126786, you will see the diode WPDE91-70063D. It attaches to the capacitor and goes down to the frame of the unit. They are not hard to replace. You need to remove the outer cover of the microwave to access the magnetron and the diode. Hope this helps.

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1 Answer

Hi Louie. The magnetron is bolted to the top RT./center of the inner area. Accessed only by removing the whole cover. Magnetron Part # WPW10126786. Thank You.

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1 Answer

Hi Louie. Carefully use a pair of insulated (handles) needle nose pliers. Steady one end of the pliers on one post. Then "short " out the other lead by touching on / off , on / off several times to completely discharge the capacitor. This part # is 8206562 . Thank You.

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