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Microwave making grinding noise

Microwave making grinding noise. Microwave ovens are some of the most commonly used appliances in our homes, and many complain about the noise they make when turned on.

However, if your microwave is making strange noises, it’s probably because an essential part needs replacing due to all that heavy usage.

Before purchasing a new piece for your microwave oven, see if either turning off and restarting your microwave or simply cleaning it improves things.

Consulting a local professional can help you find out what the problem may be specifically and go from there with a situation-specific solution.

Microwave Making Grinding Noise

microwave making grinding noise 2022 fix

We will discuss here the causes of why microwaves make a grinding noise.

Failure of a Cooling Fan

The microwave oven’s cooling fan plays a key role in the internal cooling system and contributes to the machine’s overall efficiency.

A problem with this fan is another reason for microwave noise. Sometimes the cooling fan becomes dislodged, or debris changes inside it.

This could be causing the fan to hit against another part of the microwave machinery or causing a rattling sound. The cooling fan motor can wear out and might need replacing.

Typically, you’ll hear the humming of this device when the microwave is operating normally.

However, if that noise becomes louder or there’s a buzzing sound in operation coming from inside your microwave, that typically indicates a problem with its motor.

Faulty Microwave’s Magnetron

If your microwave makes a louder noise after being used frequently and for a long period, it could suggest that your microwave’s magnetron is beginning to fail.

A faulty microwave magnetron can also cause an annoying high-pitched sound which typically means a problem with the magnetron tube.

To find out if this is the case, turn on your microwave for about 30 seconds and quickly switch the oven to low power. Suppose the microwaves of your device begin to cool down suddenly or stop completely.

In that case, you probably have a frayed magnetron (or diode – see below), which will need to be replaced for your device to function normally again.

If you notice any burning smells coming from inside the machine while it’s in use, consult our Troubleshooting page before doing anything else!

Faulty Turntable Motor

faulty turntable motor

If there’s a grinding sound coming from your microwave, it could be caused by the turntable motor.

Ovens with rotating glass trays are driven using either a small engine fitted under the oven floor or guide rollers on the oven walls.

To replace such a motor, you’ll need to remove the cover at the bottom of your oven, but before you do so, make sure you have switched off the electricity supply!

If in doubt, ask someone who knows what they’re doing. Don’t forget to check where power cables enter your microwave as well – when opening up an appliance like this.

It’s very easy to accidentally disconnect wires (and then usually get blamed for breaking something!). Once inside the microwave body itself, removing and replacing a turntable motor is normally easy.


Is using a buzzing microwave safe?

When your microwave emits a loud humming sound, it could mean that the magnetron is on its last legs and needs to be replaced as soon as possible.

Similarly, if you notice one side of your microwave suddenly getting hotter, it could indicate that the stirrer motor has worn out, which means you should contact that replaced immediately.

What’s the deal with my microwave rattling?

A thumping or rattling sound from your microwave can often be fixed by quickly checking the turntable plate. The way the plate sits in your appliance may not allow for optimal microwaving, producing a loud and annoying noise.

Check if the container is supported correctly and if there is any damage or wear and tear on the associated parts with the turntable.

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