Microwave Sparking: 6 Easy Ways To Fix The Problem Forever

Microwave ovens have become essential to modern-day kitchens due to their convenience and speed in cooking or heating up food. However, sometimes, they can experience sparking, which can cause concern for many people.

Sparking in the microwave can be caused by various factors such as food debris, damaged waveguide cover, or even a faulty magnetron. Not only can sparking be potentially dangerous, but it can also damage your microwave and decrease its lifespan.

Fortunately, there are ways to easily fix the sparking in your microwave without replacing it. This article will discuss the common causes of microwave sparking and provide practical solutions to fix them.

Why is your Microwave Sparking?

If your microwave is sparking, it is likely due to one of the following reasons:

1. Damaged Waveguide Cover

The waveguide cover is a component inside the microwave that protects the waveguide from food particles, moisture, and grease. If the waveguide cover becomes damaged or covered in grease and food particles, it can cause sparking inside the microwave.

This issue is pervasive in older microwaves or in those that have been subjected to heavy use.

2. Burnt Food Particles

Another common cause of sparking in the microwave is burnt food particles stuck to the microwave’s interior walls. When the microwave heats up, these particles can become superheated and cause sparking.

Keeping the microwave interior clean and free of burnt food particles is essential to avoid this issue.

3. Metallic Cookware

If metallic cookware is used inside the microwave, it can cause sparking. Metallic cookware includes any dishes or utensils made of metal (metal objects) or that have a metallic finish. When metal is placed inside the microwave, it can reflect the microwaves and cause sparking.

To avoid this problem, use microwave-safe glass, ceramic, or plastic cookware.

4. Damaged Magnetron

The magnetron is a component inside the microwave that generates the microwaves used to cook food. If the magnetron becomes damaged, it can cause sparking inside the microwave. This issue is common in older microwaves or in those that have been subjected to heavy use.

5. Improperly Arranged Food

The way food is arranged inside the microwave can also cause sparking. If food is placed too close to the interior walls of the microwave, it can cause sparking.

To avoid this problem, ensure your food is put in the microwave’s center without touching the walls.

6. Electrical Issues

Finally, electrical issues can also cause sparking in the microwave. If the electrical wiring or components inside the microwave (like the control board) become damaged or faulty, it can cause sparking. This issue is particular in older microwaves or in those that have been subjected to heavy use.

How to Fix a Sparking Microwave

Microwave sparking can be dangerous and needs to be fixed immediately. The following are some fixes you can try:

1. Clean the Interior

Food debris or grease buildup inside the microwave can cause sparking. Unplug the microwave and remove the turntable, roller ring, and other removable parts. 

Clean the interior of the microwave with a damp cloth and mild detergent. Be sure to dry it thoroughly before using it again.

2. Inspect the Waveguide Cover.

The waveguide cover is a small panel located inside the microwave that protects the antenna from food and moisture. If it’s damaged or has food buildup, it can cause sparking. Check the cover for any signs of damage or food debris.

If you find a broken waveguide cover, replace it. If it’s just dirty, clean it with a mild detergent and a soft cloth.

3. Check the Stirrer Fan.

The stirrer fan distributes the microwave energy evenly throughout the cooking chamber. If it’s not working properly, it can cause sparking.

Unplug the microwave and remove the cover to access the fan. Check for any signs of damage or obstruction. If it’s damaged, replace it. If it’s obstructed, clean it with a soft cloth.

4. Examine the High-voltage Diode.

The high-voltage microwave diode directs the electrical current from the capacitor to the magnetron. A faulty diode can cause sparking.

Unplug the microwave and locate the voltage diode, usually near the magnetron. Check for any signs of damage, such as burn marks or cracks. If you find a faulty diode, replace it.

5. Test the Magnetron

The magnetron is the component responsible for generating microwaves. If it’s faulty, it can cause sparking. Use a multimeter to test the magnetron for continuity. If it doesn’t have continuity, it needs to be replaced.

6. Contact a Professional

If none of the above fixes work, or if you feel uncomfortable performing the fixes yourself, it’s best to contact a professional for your microwave repair. A qualified technician can safely diagnose and repair the issue. Only attempt to repair a microwave if you’re qualified to do so, as it can be dangerous.

By following these fixes, you can address the most common causes of microwave sparking and ensure your microwave is safe to use.


Is it bad if your microwave sparks?

Yes, it can be harmful if your microwave sparks. Sparking in a microwave is not normal and could indicate a potential hazard. It can be a sign of a malfunctioning component, which may cause further damage to the microwave or create a fire hazard.

If you notice any sparking in your microwave, it is important to take action immediately to ensure your safety and the longevity of your appliance.

Why is my microwave sparking and popping?

When you hear electrical sounds like arcing, sparking, or popping from your microwave, it’s usually due to the food item being cooked. Food items with a higher fat content tend to pop and sizzle as they cook, which can cause these sounds.

To reduce this, you can cover the container with a lid or microwave-safe plastic wrap.

What to do if the microwave catches fire?

If your microwave catches fire, it is important to act quickly and carefully to minimize the damage and ensure your safety. Here are the steps to take:

Turn off the microwave: If the fire is still small, you can stop it by turning it off and unplugging it from the power source. This will cut off the power supply to the microwave and prevent further heating.

Don’t open the door: Do not open the microwave door, as this can cause the fire to spread and ignite other objects in the vicinity.

Evacuate the area: If the fire is growing and you cannot contain it, evacuate immediately and call for help. You can use a fire extinguisher if you have one, but only if you are trained.

Call emergency services: Call 911 or the emergency services in your area to report the fire and request assistance. They can provide further instructions and dispatch firefighters to the scene if necessary.

Wait for help: Wait for the emergency services to arrive and follow their instructions. Only attempt to extinguish the fire if you have the proper equipment and training.

It is essential to remember that prevention is always better than cure. To avoid the risk of a fire in your microwave, follow the manufacturer’s instructions for use and maintenance, avoid using metal or aluminum foil in the microwave, and never leave food unattended while it is cooking.

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