Is a Sparking Microwave Dangerous? How to Fix a Sparking Microwave?

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Dealing with a malfunctioning microwave is frustrating, particularly when making a meal. The functionality of a microwave can be hindered and also cause an unpleasant experience when it is sparkling inside. While sparking is not always cause for concern, it implies something is wrong.

In this post, we will discuss the topic: “Is a sparking microwave dangerous?” We will be looking at some causes of a sparking microwave and ways on how to fix them. Some frequently asked questions about sparkling microwave will also be addressed, like microwave sparking fix.

Is a Sparking Microwave Dangerous?

Is a Sparking Microwave Dangerous Causes, Prevention, and Safety Tips

Yes, a sparking microwave can be dangerous. I unfortunately witnessed a sparking microwave a few years ago. I was heating up a cup of coffee in the microwave when I noticed a few small sparks coming from the inside. I immediately stopped the microwave and unplugged it. 

A sparking microwave could indicate a malfunction or a problem with the microwave’s internal components. The magnetron or inverter are some of those internal components that malfunction. It could cause a fire or severe damage to the microwave. Improper use of an electrical appliance or malfunction can pose a risk of electrical shock. So, you must be cautious when using any electrical appliance. If you are concerned about a sparking microwave, consult a qualified repair technician.

If you notice sparks in your microwave, stop using it immediately and unplug it. It is important to be safe when using electrical appliances and to have them repaired by qualified technicians if they malfunction.

What Are the Common Causes of Sparks in Microwaves?

Before fixing a microwave, make sure you figure out why your microwave is sparking. There are of cause several reasons, and each has a different solution. If you can identify the cause of your microwave sparking, fixing it becomes easier.

Here are the five most common causes of sparking in your microwave:

1. A Metal in the Microwave

Why is my microwave sparking? The metal inside the microwave is the first reason for sparking in your microwave. Unfortunately, this is quite common and one of the most dangerous reasons.

Sparks will happen if you accidentally leave a metal spoon or fork inside your microwave. Likewise, a tiny piece of steel wool can cause sparks after cleaning or heating a dish with steel cutlery.

Microwaves work by creating electromagnetic waves which heat your food. But, it interferes with that EM field and causes sparks when a metal is inside.

2. Broken Waveguide Cover

Waveguide cover prevents your food from falling from a microwave. It shields the magnetron from food splatters. It also shields the magnetron from bugs that could enter through and cause damage.

During heating, some food particles and grease may spill or get stuck on your waveguide cover, thereby causing microwave sparking behind the waveguide cover. What happens is that the spills cause a buildup of grime which, when burnt by microwaves, can cause sparks.

3. Damaged Rack support

Some microwaves come with removable racks that allow you to cook more than one dish at a time. It is convenient but exposes your microwave to wear and tear every time. Due to heat from cooking exposing metal parts underneath, the protective plastic coating on these racks may get damaged over time. In addition, sparks are bound to happen when metal parts touch or rub against each other. So if you see sparks in your microwave while heating food, then chances are there is damage to your rack support.

4. Worn Stirrer

The worn stirrer is a rotating paddle inside your microwave. It helps distribute heat evenly to cook food more efficiently. Notwithstanding, if you notice sparks in your microwave, something needs to be fixed with your stirrer.

It could be due to damage, wear, and tear, or a broken drive motor. So, more energy focuses on one side of your stirrer than the other, overheating and sparking it.

5. Faulty Diode

A microwave diode is a minor component attached to your magnetron that converts AC to DC. But microwaves can make diodes overheat and burn out as microwaves are so powerful.

The magnetron will not generate enough power to heat food if this happens. Also, you may start noticing sparks inside your microwave. Signs of faulty diodes are a burning smell, no humming sound from the magnetron, and the inability to cook food or heat unevenly.

Is Microwave Harmful?

Is Microwave Harmful

Microwaves are a type of electromagnetic radiation with wavelengths ranging from about one millimeter to one meter. They have many applications, including telecommunications, radar, and cooking. In microwave ovens, microwaves heat food by causing the water molecules in the food to vibrate.

Microwave ovens are safe when maintained and used according to the manufacturer’s instructions. However, some potential risks are associated with misusing microwaves, such as injury or property damage. Following the manufacturer’s instructions carefully is important to ensure safe operation.

I use them regularly to heat up food and cook simple meals. I have never had any problems with my microwave ovens, and I find them to be a convenient and safe way to cook food. However, I am aware of the potential risks associated with misusing microwaves. For example, I know that it is important to avoid putting metal objects in the microwave, as this can cause sparking. I also know that it is important to use microwave-safe containers, as some containers can melt or release harmful chemicals when heated in the microwave.

Why Do Certain Foods Cause Sparks in the Microwave?

When it comes to a microwave that is sparking, some foods could cause this to happen. I encountered with this when I accidentally sparked a potato in the microwave. I had washed the potato thoroughly but didn’t realize there was still a small piece of dirt on it. When I put the potato in the microwave and turned it on, it started to spark.

Certain foods are more likely to spark in the microwave than others. Generally speaking, foods with a high water content are more likely to spark. Water molecules are polar, meaning they have a positive and negative end. When water molecules are exposed to electromagnetic waves in a microwave, they start to vibrate. This vibration can cause the water molecules to collide with each other, creating heat. In some cases, the heat can be so intense that it causes the water molecules to break apart, creating a spark.

Foods more likely to spark in the microwave include foods with a high mineral content. This is because minerals can also absorb microwaves and create heat. Some vegetables, such as carrots and broccoli, are mineral-rich and can spark in the microwave.

To avoid sparking in the microwave, it is important to wash fruits and vegetables thoroughly before microwaving them. Avoid microwaving foods with high metal content, such as aluminum foil and metal utensils, is also important. You can check out how to defrost chicken in microwave.

Can Sparks Damage a Microwave?

Sparks in the microwave may not be an immediate threat to you personally. But they can have lasting effects on the unit itself. It is because the sparks can damage the working parts of the microwave. For instance, it can damage the waveguide cover and diodes.

When there are sparks in the microwave, they tend to bounce from the object that caused the sparks.

If this happens, the waveguide cover can get permanently damaged. In addition, it can cause further sparks, resulting in the microwave no longer working.

If the waveguide cover gets damaged, this can make sparks get to the diodes through the waveguide. When this happens, the microwave can get damaged beyond repair.

How Dangerous Can A Sparking Microwave Be?

If you notice a spark coming from your microwave, immediately stop the microwave and unplug it. Sparks can damage your microwave and, in some cases, cause a fire.

Microwaves, even while sparking are not dangerous to you; they only damage themselves.

But, if broken electronics cause the sparking, there is one exception to this, there are chances of an electric shock. Don’t overlook this because I’ve seen people who has gotten an electric shock from a sparking microwave. So, it is always better to unplug the appliance to avoid this situation. This way, you will be safe, and you can later investigate the problem closely.

What Can I Do to Prevent Sparks in the Microwave?

You can do many simple things to prevent sparks in your microwave oven. Most of these are common sense things to be aware of. For instance, not putting metal in the unit and making sure you are cleaning your microwave.

Sometimes it is easy to forget that utensil in the cup of tea as you place it in the microwave. It typically happens because you are so busy multitasking that you make a mistake. Unfortunately, sometimes these mistakes can become costly if you are not careful.

I once had an experience with a sparking microwave. I was heating up a cup of tea in the microwave when I forgot to take out the spoon. I turned on the microwave, and it immediately started to spark. I quickly stopped the microwave and removed the spoon. I was lucky that the sparking didn’t cause any damage to the microwave, but it was a close call. I learned a valuable lesson that day: it is important to be careful when using a microwave and to always check for metal objects before turning it on.

Taking the time to ensure that the meal you put in the microwave is “microwave-safe” can prevent sparks. Again, this is frequently taken for granted but can save you a headache in the long run.

Cleaning your microwave regularly can prevent food particles from entering parts of the unit that should not be. In addition, it can keep your microwave working correctly for a long period. When cleaning your microwave, paying attention to what you are cleaning is crucial when cleaning your microwave. For instance, you should never use metal-based cleaning supplies, like steel wool, in a microwave. It could cause part of it to break off and be left behind.

How to Stop a Microwave from Sparking?

How to Stop a Microwave from Sparking
The next step you are to take is to figure out how do I stop my microwave from sparking since we have already discussed what is microwave sparking and how to fix it. Listed below is the standard procedure that one should follow to stop a sparking microwave. They are basically what to do if your microwave sparks:
  • The first step is to unplug the microwave immediately. If the sparks are too bright or seem to come from the microwave’s walls, unplugging and turning it off is the smartest move.
  • Check your microwave thoroughly. If you find cutlery or leave a metal dish inside the microwave, you already know how to stop the sparking. Just remove the items that were causing the problems.
  • In case you do not find any metal wire, then go ahead and check the waveguide cover. If you notice a crack or damage, that might have caused the spark. Just replace it, and you are good to go.
  • The metal is neither the problem nor the waveguide cover; the culprit is the faulty diode. In that case, go and call a professional to solve the problem. A professional may surprise you with another problem.

Why Is My Microwave Sparking?

If your microwave is sparking, it indicates a problem with the appliance, and it should be addressed immediately. There are several reasons why a microwave might start sparking, including:

  • Metallic objects: When metal objects, such as forks, spoons, or aluminum foil, come in contact with the microwave’s walls, they can create a spark. It is because microwaves bounce off metal and can cause a buildup of electrical energy in the metal, resulting in a spark.
  • Damaged waveguide cover: The waveguide cover is a small panel that covers the opening where the microwaves enter the cooking area. Over time, this cover can become damaged or rusted, which can cause sparking. Microwaves can arc and create a spark when the microwaves come in contact with the damaged cover.
  • Grease or food buildup: If there is grease or food buildup on the walls or ceiling of the microwave, it can create a spark. Food and grease can absorb microwaves, which can cause a buildup of energy and result in a spark.
  • Improper use: If the microwave is used improperly, such as running it when it’s empty or cooking food in un microwave-safe containers, it can cause sparking. It is because microwaves need something to absorb them, and if there is nothing in the microwave or the container is not microwave-safe, the microwaves can reflect and create a spark.
  • High voltage diode: The high voltage diode is a component in the microwave that helps to convert the electrical current into microwaves. If the diode is damaged or not functioning properly, it can cause sparking. The electrical current is not being converted correctly, which can create a buildup of energy and result in a spark.

Why Microwaves Spark?

Microwaves spark when they encounter a metal object or a food with a high mineral content. This is because microwaves are attracted to metal and minerals. When microwaves hit a metal object, they can bounce around and create sparks. When microwaves hit food with a high mineral content, the minerals can absorb the microwaves and create heat. If the heat is high enough, it can cause the food to spark. When I accidentally left a spoon in a cup of coffee, and I turned on the microwave, I saw sparks coming from the cup. I immediately stopped the microwave and removed the spoon.

Can I Use My Microwave After It Sparks?

Whether or not you can use your microwave after it sparks depends on the severity of the sparking and the cause of the sparking. If the sparking was minor and caused by something like a small piece of metal or food, then it may be safe to use your microwave again after cleaning it thoroughly. However, if the sparking was severe or caused by something like a damaged magnetron, using your microwave is unsafe, and you should have it repaired by a qualified technician.


One thing is clear from the article, Is a Sparking Microwave Dangerous. In most cases, the spark is provoked by the metal. Either you have left the metal inside, or depreciated parts have exposed the metals. No matter what has caused the problem, the solution is to stay composed and take the necessary steps.

We hope we have helped you fix the microwave sparking problem. If you have more issues, we’re more than happy to help. Just comment, and we will get back with a quick fix.

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