How to Fix Magnetron in Microwave

The magnetron has likely failed if your microwave is not heating food or producing sound. The magnetron is the component in the microwave that creates the microwaves that heat the food. If it is not working, you will need to replace it.

If you’re like me, you unplug it until you find time to deal with it. So, this blog post will discuss how to fix magnetron in microwave ovens. Stay with us until the end to know about this topic in detail.

Summary: Fixing a magnetron in a microwave is not as hard as you might think. Here are a few tips: 1. Check to see if the magnetron is faulty. If it is, take it out and replace it with a new one. 2. Clean the magnetron with a vacuum cleaner and a cloth. 3. Apply a coat of silicon grease to the magnetron’s poles. 4. Replace the magnetron cover.

How to Fix Magnetron in Microwave

What is the Reason That a Magnetron Fails in a Microwave?

Here are some main reasons for a magnetron to fail

1. Foreign Object Damage (FOD)

This is the number one cause of magnetron failure. FOD can be anything from a small metal shard to a large piece of wire that finds its way into the cooking chamber. When the magnetron turns on, it will be drawn into the path of the electron beam, causing it to arc and short out.

2. Electrical Overload

Like any other electrical component, the magnetron is susceptible to damage from an electrical overload. This can happen if there is a power surge or spike when the microwave is turned on, or the unit is plugged into an outlet that isn’t properly grounded. In either case, the electrical current flowing through the magnetron will be too high, resulting in a failed component.

3. Thermal Shock

This occurs when the magnetron is exposed to sudden temperature changes, such as if cold food was placed in the microwave without being adequately covered. The sudden temperature change can cause the magnetron to crack, leading to failure.

4. Mechanical Shock

This is similar to thermal shock but occurs when the magnetron is subject to a physical surprise, such as being dropped or jarred. The resulting impact can damage the internal components of the magnetron, leading to failure.

5. Excessive Use

Like any other electrical component, the magnetron will fail if used too much. The lifespan of a magnetron can be anywhere from 2000 to 3000 hours, so if your microwave is used several times a day, it’s not surprising that the magnetron will eventually burn out.

6. Manufacturing Defect

While most magnetrons are well-made and will last for many years, there is always the possibility of a manufacturing defect that can cause premature failure. The warranty usually covers this, but you may be stuck paying for a replacement if your microwave is out of contract.

7. Improper Maintenance

If the microwave isn’t adequately maintained, it can shorten the lifespan of the magnetron. This includes not cleaning the cooking chamber regularly, which can lead to food and grease buildup that can damage the magnetron.

These are the most common reasons for magnetron failures, but other less common causes exist. If your microwave stops working and you suspect the magnetron is to blame, it’s best to contact a qualified repair technician to diagnose the problem and make the necessary repairs.

9 Methods on How to Fix Magnetron in Microwave

If your microwave oven suddenly stops working, it could be due to a problem with the magnetron. If the magnetron is not working, your oven will not heat up. There are a few ways to fix a magnetron in a microwave.

Oven Will Not Heat Up

Method 1: Check the Circuit Breaker

If your microwave oven is not working, one of the first things you should check is the circuit breaker. If the circuit breaker has tripped, it will need to be reset. This is usually located in the main electrical panel for your home.

Method 2: Check the Fuses

If the magnetron in your microwave is not working, one possible reason is a blown a fuse. Check the fuses to see if they are blown. For example, there are two fuses in a microwave oven. If either fuse is blown, it will need to be replaced. How you access the fuses will depend on your microwave model.

Method 3: Check the Door Switch

Look at the door switch. This switch is located on the door of the microwave oven. When the door is closed, it should complete the circuit and allow power to flow to the magnetron. If this switch is not working, it will need to be replaced.

Method 4: Clean the Magnetron

One of the most common reasons for a magnetron to fail is because it has become dirty. Over time, food and grease can build up on the magnetron, which can cause it to overheat and fail. You can try cleaning the magnetron if you think this might be the problem. First, unplug the microwave oven and remove the plate that covers the magnetron. Next, use a soft cloth to wipe away any dirt or debris you see. Be careful not to damage the delicate surface of the magnetron. Once it is clean, replace the cover and plug the oven back in.

Try Cleaning the Magnetron

Method 5: Replace the Magnetron

If cleaning the magnetron does not fix the problem, you may need to replace it. You can do this relatively simple repair yourself, but you will need to purchase a new magnetron. Make sure to get one compatible with your model of the microwave oven. Once you have the new magnetron, follow your owner’s manual instructions to replace the old one.

Method 6: Check the Capacitor

Another component that can fail and cause the magnetron to stop working is the capacitor. It stores electricity and helps to start the magnetron when the oven is turned on. If the capacitor is wrong, it will need to be replaced.

Method 7: Check the Waveguide

The waveguide is a metal tube that delivers the microwaves from the magnetron to the cooking chamber. If this component is damaged, it can cause the microwaves to leak out, which can damage the magnetron. If you think this might be the problem, you can try replacing the waveguide. This is a relatively simple repair that you can do yourself.

Method 8: Check the Diode

The diode is a component that converts alternating current (AC) to direct current (DC). If it’s not working, it can cause the magnetron to fail. If you think this might be the problem, you can try replacing it. Unfortunately, this is a complicated repair.

Method 9: Call a Repair Technician

If you have tried all these methods and are still having problems with your microwave oven, you may need to call a repair technician. This is usually the best option when it comes to complex repairs.

These are some things you can do to try to fix a magnetron in a microwave. These methods may not work for everyone, but they are worth a try. You may need to call a repair technician if you still have problems.

Call a Repair Technician

Is It Worth Replacing the Magnetron in the Microwave?

If the magnetron in your microwave is broken, you may be wondering if it’s worth it to replace it. The magnetron is the part of the microwave that generates the microwaves that cook the food. However, replacing it can be expensive, so you may be tempted to buy a new microwave.

However, replacing the magnetron may be a better option if your microwave is otherwise in good condition. A new magnetron can cost anywhere from $30 to $100, depending on the brand and model of your microwave. In addition, the labor to replace it can cost another $50 to $100. So, all told, you’re looking at a repair bill of $80 to $200.

That may seem like a lot, but it’s cheaper than buying a new microwave. A new mid-range microwave can cost $100 to $250, and a high-end model can cost even more. So, if you can get your hands on a replacement magnetron, it’s worth replacing it rather than buying a whole new microwave.

So, replacing the magnetron may not be worth it if your microwave is old and outdated or has been damaged in some other way. In that case, it might be best just to buy a new microwave. But if your microwave is still in good condition, replacing the magnetron is the way.

Replacing the Magnetron May Be a Better Option

Frequently Asked Questions

Is It Worth Replacing a Magnetron in a Microwave?

The decision of whether or not to replace a magnetron in a microwave depends on factors such as the model of your microwave and its age. However, if you’re unsure whether or not it’s worth replacing your magnetron, there are some things that you can do to determine if it’s necessary.

One way to test for metal fatigue is by measuring how far an electric current will travel through the Magnetron before breaking. If the current breakpoint moves farther away with each passing day, then it may be time for a replacement. Additionally, magnetic fields can also cause electrical problems in other parts of your home electronics system so it might be best to call an expert if concerned about this issue too. In most cases though, simply monitoring power usage and checking for burnt food/odor clues may provide enough information for you to make a wise decision about replacing your Magnetron in your Microwave oven.

What Causes a Magnetron in a Microwave to Fail?

A magnetron is a component in a microwave that uses microwaves to heat up food. If the magnetron fails, the microwaves can’t heat up the food and it will likely not cook. There are many possible causes of a magnetron failing, but the most common ones are overheating, caused by something blocking the heat from reaching the magnetron, or moisture getting inside the magnetron.

Is It Possible to Repair a Magnetron?

While repairing a magnetron may not be as feasible as replacing it, there are certain steps that can be taken to minimize damage and restore functionality. Before doing anything else, turn off the power to the device by unplugging it from the electrical outlet and flipping the breaker switch. Next, remove any obstructions that may have fallen into or been pulled onto the machine during operation. This includes wires, boxes, etc., since they can create sparks that could start a fire. Finally, wait for all safety concerns to be addressed before beginning work on repairs.

Why is My Microwave Running but Not Heating?

There could be a few reasons why your microwave is not heating up. First, it’s important to make sure that the power cord is plugged into an outlet and then into the wall socket. Next, check for any obstructions in the pathway of radiation (usually around doors and windows). If these are cleared, you may need to replace your microwave oven filters. Finally, if there is food or grease buildup on the interior walls or door seals, this will interfere with microwaves’ ability to heat up food properly.


Replacing the magnetron in your microwave is a tough decision. You might be wondering if it’s worth all of the hassle.

Is it worth replacing the magnetron in your microwave oven? Unless you have severe problems and want to update your look, there’s no real reason to replace this part. And if you decide to replace magnetron, be sure to take all necessary safety precautions!

If you read the above methods carefully, you know the answer to How to Fix Magnetron in Microwave. We hope this guide was helpful and informative!

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