Microwave Sparking Inside: Stop Immediately

Arcing means metal, a burnt waveguide cover, or a damaged cavity. Stop using it until you find the cause.

By Colton ReyesOctober 23, 20253 min read read

Written by Wade Holbrook, Lead Technician — True Fix Dallas. Factory-trained, EPA-certified, 9 years servicing Dallas–Fort Worth.

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.

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.

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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