Microwave oven magnetrons fail over time due to a combination of thermal stress, internal cathode aging, electrical arcing, and user operation errors. Running a microwave while completely empty or with metal utensils inside creates severe microwave reflection, bouncing energy back into the magnetron and overheating the delicate internal antenna. Furthermore, grease and food splatters accumulating on the waveguide cover can carbonize and cause electrical arcing that punctures the tube. You can troubleshoot magnetron protection easily. You can verify that your corrective action is successful when avoiding empty runs, keeping the waveguide cover spotless, and preventing metal use extends the operational lifespan of the magnetron.
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