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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

Bob, based on the model number you'll need to use part number WB27X10735 for the magnetron replacement. We can only suggest the parts listed in the parts lists from the manufacturer, sorry.

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1 Answer

Hello Keith. You most likely have a "high voltage" side malfunction. Transformer, diode, magnetron, Capacitor. You will need to be extremely careful if you decide to test the components with a multi meter, Very high residual voltage is present, so make sure you remove power to the microwave and short across the terminals on the capacitor. The magnetron should have a reading of less than 1 ohm resistance across the two terminals, and an "open" circuit between each terminal and chassis ground. The diode/rectifier should have a resistance reading in one direction only, no resistance, or resistance in both directions indicate a faulty diode. The primary winding on the trans former should read approximately 450 Ohms resistance, the secondary winding should read 80 ohms resistance, and the filament transformer should read 100 ohms resistance. If all the readings are proper and in range, replace the magnetron.

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1 Answer

Hello Raj. Check and see if the magnetron is arcing. If so, replace the magnetron in the unit.

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1 Answer

Hello Nelson. You most likely have a "high voltage" side malfunction. Transformer, diode, magnetron, Capacitor. You will need to be extremely careful if you decide to test the components with a multi meter, Very high residual voltage is present, so make sure you remove power to the microwave and short across the terminals on the capacitor. The magnetron should have a reading of less than 1 ohm resistance across the two terminals, and an "open" circuit between each terminal and chassis ground. The diode/rectifier should have a resistance reading in one direction only, no resistance, or resistance in both directions indicate a faulty diode. The primary winding on the trans former should read approximately 450 Ohms resistance, the secondary winding should read 80 ohms resistance, and the filament transformer should read 100 ohms resistance. If all the readings are proper and in range, replace the magnetron.

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1 Answer

Hello Mike. You most likely have a "high voltage" side malfunction. Make sure the thermostat WB27X10195 is good and if so, then test the Transformer, diode, magnetron, Capacitor. You will need to be extremely careful if you decide to test the components with a multi meter, Very high residual voltage is present, so make sure you remove power to the microwave and short across the terminals on the capacitor. The magnetron should have a reading of less than 1 ohm resistance across the two terminals, and an "open" circuit between each terminal and chassis ground. The diode/rectifier should have a resistance reading in one direction only, no resistance, or resistance in both directions indicate a faulty diode. The primary winding on the trans former should read approximately 450 Ohms resistance, the secondary winding should read 80 ohms resistance, and the filament transformer should read 100 ohms resistance. If all the readings are proper and in range, replace the magnetron.

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1 Answer

Hello Heath. You most likely have a "high voltage" side malfunction. Transformer, diode, magnetron, Capacitor. You will need to be extremely careful if you decide to test the components with a multi meter, Very high residual voltage is present, so make sure you remove power to the microwave and short across the terminals on the capacitor. The magnetron should have a reading of less than 1 ohm resistance across the two terminals, and an "open" circuit between each terminal and chassis ground. The diode/rectifier should have a resistance reading in one direction only, no resistance, or resistance in both directions indicate a faulty diode. The primary winding on the trans former should read approximately 450 Ohms resistance, the secondary winding should read 80 ohms resistance, and the filament transformer should read 100 ohms resistance. If all the readings are proper and in range, replace the magnetron.

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1 Answer

Hello Eddie. You need to check and see if the magnetron is burnt out. Also, if it is bad, replace the doide in the unit as well.

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