Microwave Sparking: Is It Safe?

Published 7 October 2026 · Repair Centre Kota

Short answer: Stop the microwave immediately. Sparking is usually caused by metal, but it can also mean damage inside the oven.

Common causes

Metal inside. Foil, gold-rimmed plates, metal twist ties or a steel container can cause sparks.
Damaged waveguide cover. Food splatter or burn marks on the small cover on the side wall can spark.
Burnt or damaged interior. Chipped paint or burn marks inside can cause arcing.
Grease build-up. Built-up grease and food can burn and spark.

What you can check safely

Stop the oven and unplug it
Remove any metal items
Let it cool, then wipe the inside and the waveguide cover with a damp cloth

When to call a technician

If it sparks again with only a cup of water inside and the oven clean, stop using it and call a technician. Never run a microwave with nothing inside.

Need it fixed? We repair out-of-warranty appliances at your door in Kota. Visit charge ₹500; the repair cost is quoted after the check.

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