Microwave Noisy and Not Heating? Here’s What To Do

Fred's Appliance
March 7, 2023
Microwave Repair

We’ve all been there — you go to heat up your food in the microwave, and it starts making a weird noise. Or, even worse, it doesn’t heat up your food at all.

If your microwave is noisy and not heating, don’t panic! There are probably a few reasons why your microwave is making strange noises. Read on to learn more. 

If your microwave is noisy and not heating, the fan could be dirty

If your microwave is making a lot of noise and not heating up, the fan could be dirty.

While you can’t clean the fan itself, you can clean the vents and encourage clean airflow in the microwave.

  • To clean your microwave vents, begin by unplugging the appliance and removing any plastic grills at the top or bottom. 
  • Then, use hot water and dish soap to scrub away any tough grease stains — adding baking soda can help make it easier.
  • Once you’ve completed cleaning, ensure that the vent is dry before returning it back to its place. You can also take this time to wipe down the light glass cover with a microfiber cloth.

If you find that this has fixed the issue, great. But if it hasn’t, you may have a more significant malfunction on your hands, so it may be time to consult an expert.

The turntable isn’t turning properly

Noisy microwaves can be a menace when all you want is a warm meal. One possible reason for this irritable racket is the turntable not turning. Don’t panic yet – if that’s the case, it’s likely due to something blocking its movements. 

Make sure to double-check that nothing has sneaked its way in between the food and the spinning dish. It could be a simple fix, after all! In any case, clear away any objects patiently obstructing the turntable, and your microwave should return to normal operation soon

The magnetron tube is damaged

If you’re experiencing a noisy or non-heating microwave, the third most common cause may be damage to the magnetron tube. Unfortunately, this part cannot easily be replaced at home. Instead of attempting to DIY, you’ll need to reach out to an experienced repairman. With a specialist providing the necessary analysis and expertise, you can rest assured that your appliance is in capable hands

Other causes for a noisy microwave

It is important to note that certain errors in a microwave will require the expertise of a specialist or repair professional to replace them. This is due to the potential dangers associated with microwaves emitting radiation if they are repaired improperly. Therefore, it is crucial to take any necessary precautions when dealing with microwave repairs and seek out qualified professionals who have the knowledge and experience needed to address these issues safely and effectively. 

By doing so, you can help ensure that your microwave is functioning properly and that you are not putting yourself or others at risk of harm from radiation exposure. So if you encounter any errors with your microwave, be sure to prioritize safety first and seek out professional assistance as needed.

Buzzing sounds

If your microwave has been making a buzzing noise recently, it may be due to the integrated cooling fan. Over time, the fan can get clogged with dust or dirt and may even become loose, causing loud rattling sounds when it turns. 

The noise from the fan is usually louder at the back of the microwave and should be accompanied by a low hum during normal operation. If you notice a loud buzzing sound coming from your microwave, it might be time to check on its cooling fan.

Clicking sounds

If your microwave is making a clicking noise, it could be due to a faulty turntable motor. This motor powers the plate that slowly rotates your food inside the microwave to ensure even cooking. If the motor is not working properly, it can cause the plate to stop turning or make a loud clicking sound as it struggles to run. 

In either case, this clicking noise indicates that there is an issue with your turntable motor, and you should have it looked at by a professional in order to avoid any further problems.

Grinding noises

Is your microwave making a grinding noise? This could be a sign of either a faulty turntable motor or a defective stirrer motor. The stirrer motor is what moves the blade that creates electromagnetic waves to ensure even cooking. 

If there’s an issue with this motor, it has to work harder, which can result in loud, annoying noise and uneven heating of food. It’s best to get your appliance checked out by a professional if you hear such sounds coming from it.

Loud humming sounds

If the microwave is making a loud humming noise, it’s likely due to a faulty or worn-out diode. This part of the appliance is responsible for converting AC to DC power in order to supply the magnetron with electricity. 

If this diode isn’t working correctly, not only will you get annoying humming sounds, but also no heat from your microwave. So if your device is making strange noises, it might be time to have a professional investigate the diode and have it replaced.

Screaming or screeching sounds

If your microwave is making a loud and shrill screaming or screeching noise, it’s likely due to a worn-out or defective magnetron. The magnetron is the component inside your microwave that produces microwaves used in cooking. Over time, regular use can cause this part to wear out. So if you find yourself dealing with an annoying sound coming from your kitchen appliance, chances are that the magnetron needs to be replaced.

If your microwave is being noisy or not heating up food properly, there are a few things you can check before calling a repairman. 

First, make sure the vents aren’t dirty – simply clean them with a damp cloth. Second, ensure that nothing is blocking the turntable from turning. If none of these solutions work, it’s likely that an essential component will be damaged and will need to be replaced by a professional. Knowing these simple tips can save you time and money in the long run!

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