Sparks inside a microwave are a fire risk. Stop the cycle and investigate before using it again.
Remove Any Metal
Foil, metal trim on dishes, or twist ties cause immediate arcing.
Fix: Use only microwave-safe cookware with no metallic decoration.
Check the Waveguide Cover
The small mica panel on the cavity wall chars and arcs when splattered with grease.
Fix: Clean it; if it is burnt or flaking, replace the cover.
Inspect the Cavity Paint
Chipped interior paint exposes metal that arcs.
Fix: A technician can advise on repainting with microwave-safe coating or replacing the unit.
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