GE Microwave Magnetron (WB27X10939) (Replaces WB27X10880)

The GE Microwave Magnetron is the core component responsible for generating the microwave energy that heats and cooks your food. It works by converting electrical power into microwave radiation, which is directed into the oven cavity to excite water molecules in food and produce heat. This part is compatible with GE microwave and Advantium appliances.

Important Compatibility Note: Part number WB27X10939 is the current manufacturer-approved replacement for the following discontinued part number(s): WB27X10880. If your appliance documentation or old part uses any of these numbers, this is the correct, updated component for your repair.

The GE Microwave Magnetron can fail due to age, overheating, running the microwave empty, or damage from arcing inside the cavity. Power surges, worn filaments, or a failing cooling fan that allows the magnetron to overheat can also shorten its lifespan and cause it to stop generating heat entirely.

If you notice any of the following symptoms, your magnetron may need to be replaced:

- Microwave runs but does not heat food at all

- Food takes much longer than normal to heat or cook unevenly

- Loud buzzing or humming sound during operation

- Burning smell or visible arcing inside the microwave cavity

- Microwave trips the circuit breaker or blows a fuse when started

- Display and turntable work normally but no heat is produced