Can You Use a Microwave Without the Waveguide Cover?

The larger part of the operations of the microwave depends on the magnetron. It’s the vacuum tube that produces microwave radiation.

The produced microwave radiation is transmitted to the inner cavity of the microwave where food and other substances to be microwaved are placed by the waveguide.

So basically, the waveguide is purposely meant to guide and transmit microwave radiation produced by the magnetron to the cooking chamber of the microwave.

Yes, the microwave can work perfectly without the waveguide cover but it could be of great disadvantage to the microwave’s magnetron and other internal circuits.

When the microwave usage without the waveguide cover continues for some time, it will render the magnetron beyond repair.

And comparing the price of both the magnetron and the waveguide cover, it makes sense to find a replacement as soon as possible when it goes bad before using the microwave again.

The price of the magnetron is more than ten times that of a waveguide cover.

How Important is a Microwave Waveguide Cover?

As noted earlier, the microwave waveguide cover doesn’t add up to the operations of the microwave.

Hence, without it, the microwave can function to the fullest. But as it’s functioning perfectly as needed, its internal components will also gradually be destroyed.

Among the many functions the waveguide cover plays in the microwave, two of them stand out. And these are;

  • Protect the magnetron and other electronic components
  • Guide waves from the magnetron

Protect the magnetron and other electronic components

The waveguide cover protects the magnetron and other electronic components of the microwave from splashbacks caused by cooking.

So the waveguide cover must stop any moisture or food particles that try to find their way into the internal electronic components of the microwave.

Without the waveguide cover, splashed moisture and food particles will get to the internal electronic components, which will end up corroding the parts.

And with time, the microwave will stop working unless repaired, which in some cases, damage may go beyond repairs.

The waveguide cover also serves as protection for the passage of microwave radiation from the magnetron.

Guide waves from the magnetron

After the magnetron produces microwave radiation and is transited through the waveguide, the waveguide cover guides the radiation into the microwave.

 In short, it helps convey microwave radiation from the magnetron to the inner cavity of the microwave.

Can a Microwave Waveguide Cover Be Replaced?

The microwave’s waveguide cover doesn’t last forever. It weakens with time as splashed moisture and food particles settle on it.

They can also get cracked, burnt, or chipped. And it’s always advisable to replace it if either of these happens with your waveguide cover.

The waveguide is normally made of the material mica. Newly purchased waveguide covers are strong and tough.

But consistent spilling of moisture and food particles on it causes it to weaken and becomes soft. It could also get corroded or damaged accidentally.

You will need to purchase your new waveguide cover here. And for you to get the correct parts that fit your microwave, you will have to know the microwave’s model number.

And the location of the model number varies for each microwave brand. But most often, the model number of microwaves is found on the inside of the door or the mouth of the inner cavity of the microwave.

It’s now time to remove the damaged waveguide cover. So make sure you disconnect your microwave from the mains before working on it.

Do well to discharge the capacitor as well, as microwaves always have lethal voltage even when unplugged.

Can a Microwave Waveguide Cover Be Replaced
Can a Microwave Waveguide Cover Be Replaced

Start by first removing the turntable and the roller ring. Unscrew any screw you find on the waveguide cover that’s holding it to the inner cavity of the microwave. It is easy to remove it after you’ve unscrewed all the screws.

It might even slide out on its own. If not, you just hold on to the part and slide it out of whatever slot its edges have been put into.

Now, you’ve gotten rid of the old damaged waveguide cover and are on your way to fixing a new one.

Do well to clean the edges of where the waveguide cover was if you find any dirt there.

After all that has been done, you pick your newly purchased waveguide cover and slide it into where you removed the old one from.

It’s now time to screw the new waveguide cover to the walls of the inner part of your microwave. You’re set now.

Now that the microwave waveguide cover has been successfully replaced, you can return the microwave’s roller ring and turntable.

And after all that, it’s advisable to clean the microwave. That isn’t part of the replacement process but will help enhance your microwave’s neatness and good smell.

Fill a jug with about 300mml of water. Squeeze half of an average-sized lemon into the water, and place your jug into the microwave.

Turn on the microwave for about 5 minutes. When the time has been exhausted, you take out your jug and wipe away the condensation with a clean and soft cloth.

Your microwave is ready to be used to the fullest.

Can I Make My Waveguide Cover?

You can make your waveguide cover if only you’ve got the means to get the necessary materials and tools to make it.

So to start with making a waveguide cover, you can get the material from any nearby appliance repair shop. You can go there with your damaged waveguide cover.

And in buying the material, ensure the dimensions are at least an inch larger than your old damaged one.

Place your purchased waveguide cover material on a clean workbench or table and the old waveguide cover on it.

Trace the old cover on the new larger purchased material with a razor knife. Cut out the overlapping parts of the material per the dimensions of the old damaged one.

Can I Make My Own Waveguide Cover
Can I Make My Waveguide Cover

Now that you’ve cut out the dimension of your waveguide cover find yourself a screwdriver.

Use the screwdriver to make holes on the waveguide per the holes inside the microwave where the waveguide cover will be positioned.

Do well to take the necessary measurement before you cut anything out to avoid rendering the material useless or wasteful.


The microwave waveguide cover doesn’t have any effect on the functioning of the microwave. Hence, the microwave can be used anytime without the waveguide cover.

The essence of the waveguide cover in the microwave is to protect the magnetron from getting spilled with food particles.

And it also protects other internal electronic components from the reach of microwave radiation and splashbacks of food.

These things cause the internal electrical components to corrode and harm the functioning of the microwave.

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