Microwave Sparking Inside – What Part Fixes This Problem?
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Understanding the Problem
Sparking or arcing inside your microwave is alarming but often has a simple fix. The most common cause is a damaged or burned waveguide cover — the small cardboard-like panel on the inside wall that protects the magnetron opening. When this cover gets food splatter on it, it can burn and cause arcing. Other causes include a damaged interior cavity coating with exposed metal, a cracked or chipped rack support, or metal accidentally left inside the microwave.
Common Causes
- Burned or damaged waveguide cover
- Chipped interior cavity paint exposing metal
- Cracked rack support or turntable coupler
- Food splatter buildup on waveguide cover
- Damaged stirrer blade or cover
Popular Parts That Fix This Problem
These are the most common replacement parts that fix this problem. When you're ready to order, click below to find the right part at PartsDiscount.com — just search by your appliance model number for a guaranteed fit.
Helpful Repair Tip
Stop the microwave immediately if you see sparking. First check for any metal objects, foil, or dishes with metallic trim inside. Then inspect the waveguide cover — it is usually on the right side wall or the top of the interior. If it is burned, scorched, or has holes, replace it. Also check the interior walls for any paint chips or scratches that expose bare metal — these spots can be repaired with microwave-safe cavity paint.
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