Microwave Sparking? – Here Are Multiple Fixes and Causes

Nothing is more alarming than trying to reheat leftovers in the microwave and seeing sparks instead. When your microwave starts sparking, there are a ton of problems that can cause it to do so.


Luckily, there are some microwave sparking problems that you can easily fix by yourself.

Here’s why a sparking microwave might be happening and what you can do about it. Here is what I have outlined:

  • Sparks in your microwave can be caused by a variety of factors.
  • What are the dangers are of a microwave that is sparking?
  • What can be carried out to prevent a microwave from sparking?
  • Sparks can be caused by what materials?

Ready? Now that we’ve sorted that up, let’s move on to the in-depth article about microwave sparking.


There are plenty of causes why your microwave might be sparking.

Let’s take a closer look at what’s underneath the hood of this machine and see what it has to offer. Unlike traditional ovens, this one works through convection. In microwave ovens, food is heated by electromagnetic waves called microwaves. These are generally safe most of the time. Electromagnetic waves can, however, become electricity in certain situations. It is at this point that sparks begin to appear in the microwave.

It is fortunately only possible for that to happen for a few reasons. The majority of them can also be fixed relatively easily.


It’s possible that sparking is caused by metal in the microwave.

When it comes to placing metal in the microwave, it is always a bad idea. It is likely that you have heard that statement before, but you may not be aware of why that is the case. Well, it turns out that metal and electromagnetic waves don’t get along very well at all. It is no secret that when metal is placed in the microwave, it creates a lot of sparks. Electromagnetic waves are converted back into electricity, resulting in a serious light show.

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It’s most likely that there’s metal inside your microwave if it sparks when it runs. Your spoon may be in your coffee, or you may have left some tin foil on your leftovers. Sparks can be caused by even a small scrap of steel wool left after cleaning.


The waveguide cover inside the microwave is broken.

The following is a little more technical in nature. Microwaves cook your food through a panel called a waveguide. Your microwave is in trouble when the waveguide cover is broken.

Microwave ovens have waveguide covers to protect their electronics. The electronics can become clogged with steam and food particles if the waveguide cover is broken. Your microwave’s waveguide cover may be broken if you notice sparks coming from a panel.


Microwave sparking may be caused by a faulty diode.

A faulty diode is the least likely cause of a sparking microwave, but it is also the most dangerous.

Microwaves produce waves and cook food using diodes. Sparks will appear if you have one or more faulty diodes. It is likely that your microwave will stop working shortly afterward as well.


There is also the likelihood of microwave sparking from grapes.

Yes, it is true that grapes can cause your microwave to spark up! There is, however, a possibility that you did it on purpose if that is the cause. By cutting a grape nearly in half and then microwave it, you can create plasma and balls of light. It can damage your microwave, so don’t do it with a unit you plan to use in the future.


How dangerous is a sparking microwave?

When your microwave starts sparking, you will most likely be perfectly safe in most cases. Nevertheless, you should turn the microwave off immediately if sparks appear in it. Sparks will permanently damage the inside of your microwave. While sparking microwaves aren’t dangerous to you, they are dangerous to themselves.

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Sparking microwaves can be dangerous in one situation. The microwave is at risk for electrocution if it is sparking due to malfunctioning electronics.

Unplug your microwave if you’re not sure if it’s safe. If you do that, you will be able to avoid any dangers and investigate the problem more thoroughly.


What is the most effective technique to stop a microwave from sparking?

Identifying the cause of a sparking microwave is the first step to fixing it. In order to prevent a sparking microwave every time, here are four steps you need to follow.

  1. Turning off the microwave as soon as possible is very Unplug the microwave if the sparks were extremely bright or appeared to come from the walls. Electrocution is not something you want to risk!
  2. You should check your microwave to see if it has any metal in it. Use of a metal dish or leaving cutlery inside may have caused the problem. Once you get rid of it, you should be ready to go.
  3. If there is no metal in the microwave, inspect the waveguide cover. On the inside of the microwave’s thicker side, you will find this small panel. Sparks are most likely caused by cracked or damaged parts. In order to replace your microwave waveguide, you will need to order a replacement and unplug it. When it comes to cheap microwaves, it’s easier just to purchase a new one. However, it may be worth saving money on more expensive models.
  4. Unless there is metal in the waveguide, a faulty diode is probably the culprit. If this is the case, leave the microwave unplugged and contact a professional repair service. Alternatively, you can recycle your old microwave and buy a new one.


Sparking in a microwave is caused by what material?

If you want to prevent your microwave from sparking, make sure you only use microwave-safe materials. It is best to avoid certain substances that can cause sparks.

  • The tines of metal forks are guaranteed to cause sparks and arcing electricity. It’s not much better to use spoons and keep cutlery out of the microwave.
  • Wrapping your food in tin foil can cause microwave sparks accidentally. It is pretty much impossible to interfere with electromagnetic waves because metal reflects them so well. Make sure your food is unwrapped before you microwave it.
  • Steel wool causes sparks in the same way that forks and tin foil do. Steel wool can also be flammable, so you’ll have bigger You can clean your microwave with something else than water.
  • Wrappers for poptarts can act like tin foil in the microwave. Remove the wrapper from your breakfast before heating.
  • A hot-spot reaction occurs in grapes since they are small and contain a high water content. A grape will form plasma if you cut it almost in half, but leave the two halves connected. This is a fun experiment to try if you don’t need your microwave anymore.
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What should I do if my microwave keeps sparking?

By now, you have probably learned a few tips and tricks that can help you prevent your microwave from sparking. Fixing some of them is straightforward, while fixing others requires more technical skills.

Your problem will usually be solved by removing any metal objects or turning off your microwave. The waveguide, diode, or stirrer may need to be checked if that doesn’t work. Sparking could be caused by any of these components.

If none of those are the causes, it might be time to replace your microwave altogether. There is probably something you can do if your microwave sparks or arcs.



There is nothing more frightening than a sparking microwave, but luckily, it’s usually not a dangerous one.

You can stop most sparks in their tracks by unplugging your microwave and removing any metal inside. Your best bet is to call in the experts if it appears that there is a faulty electrical component. As a result, your microwave will not spark in the future, keeping you safe.

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I truly thank you for spending the time to read, and I wish you have a fantastic day!


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