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Customer Questions and Answers for Magnetron Assembly (Microwave Oven) by Ge

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Manufacturer Part
4.89 (64)
By: Ge
Part Number: OEM11378703
Manufacturer Part Number: WB27X10735

A replacement magnetron assembly that generates the microwave energy used for cooking and reheating. Installs in countertop and over-the-range microwave ovens to restore normal heating performance when the magnetron fails. What it does:

  • Produces high-frequency microwave energy that heats food inside the oven cavity.
  • Commonly replaces a unit when the microwave stops heating or heats very weakly.
  • Can address symptoms like no/poor heating, intermittent heating, or loud humming from the oven during operation.
  • Not a control or capacitor—this part is the microwave-generating tube and works with the oven's HV system.
What's included: One magnetron assembly. Install notes:
  • Always disconnect power and unplug the appliance before starting service.
  • The high-voltage capacitor can retain a dangerous charge; discharge properly.
  • Handle the magnetron carefully; avoid touching terminals or the antenna.
  • Follow OEM instructions and safety guidelines for reassembly and testing.

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Questions & Answers

For Ge Magnetron Assembly (Microwave Oven) (Part Number: OEM11378703)

1 Answer

Mike, You should always discharge the capacitor when working on a microwave. The capacitor is located on the right side of the unit inside the cabinet next to the magnetron.

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1 Answer

Hello Mike. You need to disconnect the power and uninstall the unit. Then remove the outer cover. You will then remove the wires from the magnetron and remove the nuts securing the unit to the cabinet. Remove the old and install the new in reverse order.

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1 Answer

Hello Joyce. It produces magnetic whaves which causes the food to get hot and cook.

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Jim for Model Number RVM1325003

A metallic bread tie was accidentally left in the unit on top of the glass tray. The wire arced/sparked for 5-10 seconds before it was noticed and removed. The microwave worked once or twice afterword but now will only make a slightly louder humming noise than normal but no heating. Haven't removed case yet, but was wondering where to start, 1) Diode 2)Capacitor 3)HV transformer or 4)Magnetron. It seems that if all 4 components are bad it may be more cost effecive to just buy a new microwave.

1 Answer

Hello SN, In order to replace the magnetron on unit you will have to pull unit from installation and remove the outer cabinet.

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1 Answer

Hello Justin. No, the 2 parts are not cross references according to the manufacture.

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