WARNING!

To avoid personal injury or death, disconnect your appliance from its power source before you start any troubleshooting or repair work. Use caution when working inside any appliance.

Magnetron

If you hear a low humming sound while the microwave is running, it's probably the magnetron making the sound. Unless the microwave is set to high, the magnetron cycles on and off while cooking. Sometimes the cycling may sound more like a thump depending on your model microwave.

The other reason for a humming sound is because there is a transformer inside the case. This reduces power from the 110V feed to a level sufficient to operate the clock and light in the microwave. This particular humming sound will be noticeable when the microwave is not running.

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Microwave Repair Guide
1. How can I repair chips and scorch marks in the microwave? 2. Why does my Microwave show the time but it won't cook anything? 3. My Microwave is plugged in, why won't it do anything? 4. Why can't I adjust the power setting? 5. Why won't the turntable turn? 6. Why does the display flicker? 7. Why does my Microwave buzz or hum and not heat?		8. Why did my Microwave stop working when I slammed the door? 9. Why do I see steam coming from the door of the Microwave? 10. Why does my Microwave make a humming sound while cooking? 11. Is it normal to hear a fan running in the Microwave? 12. Why does my Microwave case feel warm during and after cooking? 13. Should I cover the food I am cooking in the Microwave?		14. Can I heat up baby food in my Microwave oven? 15. How can I tell if a dish is Microwave safe or not? 16. Why won't popcorn pop in my Microwave? 17. Why do I hear popping sounds? 18. Why do I smell smoke from my Microwave oven? 19. Why does my food over or under cook in the Microwave? 20. What does error code PF mean?

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