If your microwave is making noises, we hope after reading this article you will be able to find the source of the noise and fix the underlying cause. When you can hear a noise, it’s almost always due to one or more components in your microwave being defective. Sometimes this can be a component that is easy to fix, and sometimes it might require a more difficult repair to be made.
In this guide, we will describe the main noises people hear coming from their microwaves and then identify the part that is most likely causing it to occur.
Before progressing any further, we need to point out that working with the internal components of a microwave is very dangerous due to the risk of electrical shocks. Please don’t attempt any of these repairs if you’re not experienced and/or qualified to do so.
If your microwave is making a loud buzzing noise, it might be caused by the magnetron. The magnetron produces the electromagnetic waves that cook your food or heat your drink when you put it in the microwave. When your microwave is running, you will usually hear a light, buzzing-type noise, which is caused by the magnetron. If that “normal noise” is much louder than it usually is or you can hear a high-pitched sound when your microwave is running, it’s probably caused by a faulty magnetron.
To check the magnetron, you need to:
If your microwave is making a loud humming noise, the culprit could be a defective diode. The diode works with the magnetron and capacitor to power your microwave. Its role is to convert the alternating current into direct current so that your appliance has enough high voltage to provide power to the magnetron.
To check the diode, you need to:
If you can hear a rattling noise coming from your microwave, it’s most likely caused by a faulty cooling fan. The cooling fan can sometimes get loose debris caught in it or gets knocked around and ends up out of position. When either of these things happens, the fan can rub up against other parts of the microwave, and a rattling sound occurs.
Here’s how to check if the cooling fan is the source of the rattling noise:
If the noise you can hear coming from your microwave sounds like grinding, the turntable motor could be to blame. This motor helps the turntable to rotate; when it becomes faulty, it might start making a grinding noise.
Here’s how to check if the turntable motor is the source of the noise:
Another possible source of a grinding noise is a faulty stirrer motor. This motor provides power to a metal blade in your microwave that is there to distribute energy around the microwave. When this motor becomes faulty, a grinding noise can develop.
Here’s how to check the stirrer motor:
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