Customer Questions and Answers for Magnetron (Microwave) by Whirlpool

This microwave magnetron is the high-voltage tube that creates the microwave energy used to heat and cook food. Replace it to restore heat when the unit runs but doesn't heat or makes an unusually loud electrical hum.

• Produces the microwave energy that cooks food inside the oven cavity
• Common failure sign: microwave runs but does not heat
• May be accompanied by a loud humming/buzzing or a burning odor near the magnetron area
• Note: Similar no-heat symptoms can also be caused by the high-voltage diode, capacitor, or transformer—diagnose before replacing

• Unplug the microwave and discharge the high-voltage capacitor before servicing; lethal voltage is present
• Access typically requires removing the outer cabinet; document wire locations and screw positions for reassembly
• Handle the ceramic antenna carefully; ensure the waveguide cover/seal and all shielding screws are intact and reinstalled