Is your once-quiet microwave suddenly sounding like a miniature construction site? Don’t worry, the ‘microwave making loud noise’ phenomenon is not new.

Many homeowners face this issue and there are often simple solutions.

This article explores the common reasons behind a noisy microwave and provides you with easy fixes to restore peace to your kitchen.

Skip to:

• Understanding microwave noise
• The impact of a noisy microwave
• Common reasons for loud microwave noise
• When to DIY and when to call a professional
• Preventing future microwave noise issues
• Getting to the root of the issue

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Understanding microwave noise

Before we dive into the specifics, it’s important to understand that some level of noise from your microwave is normal. 

The hum of the transformer, the whir of the cooling fan, and the gentle buzz of the turntable motor are all part of its regular operation. 

However, when these sounds become unusually loud or you hear new, concerning noises, it’s time to investigate.

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The impact of a noisy microwave

While a loud microwave might seem like a minor annoyance, it can have broader impacts:

1. Energy efficiency: A noisy microwave often indicates it’s working harder than it should, potentially increasing energy consumption.
2. Food quality: Uneven cooking due to turntable issues can affect food quality and safety.
3. Kitchen ambiance: A loud appliance can disrupt the peace in your kitchen and home.
4. Potential safety hazards: Unusual noises could be early warning signs of more serious issues.

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Common reasons for loud microwave noise

1. Faulty turntable

One of the most common sources of unusual microwave noise is the turntable. The turntable is responsible for rotating your food to ensure even heating, but when it malfunctions, it can create quite a racket.

Potential issues:

• Misaligned turntable
• Worn out turntable motor
• Damaged turntable wheels or support

Easy fixes:

1. Remove the turntable and glass tray. Clean the support and underneath area thoroughly.
2. Check if the turntable wheels are intact and properly seated.
3. Ensure the glass tray is correctly positioned on the support.
4. If the noise persists, the turntable motor might need replacement (a job for a professional).

2. Magnetron problems

The magnetron is the heart of your microwave, responsible for generating the microwaves that cook your food. When it starts to fail, it can produce a loud buzzing or humming noise.

Potential issues:

• Worn out magnetron
• Faulty diode

Easy fixes: 

Unfortunately, magnetron issues usually require professional intervention. However, you can:

1. Check if the noise occurs only when cooking or all the time.
2. If it’s constant, it might be another component.
3. If it only happens during cooking, it’s likely the magnetron, and you should call a technician.

3. Cooling fan malfunction

Your microwave’s cooling fan prevents overheating. A malfunctioning fan can cause loud, persistent noise.

Potential issues:

• Obstructed fan
• Worn out fan motor
• Loose fan blades

Easy fixes: 

1. Unplug the microwave and remove the outer casing (if you’re comfortable doing so).
2. Check for any visible obstructions around the fan.
3. Gently clean the fan blades with a soft cloth.
4. If the fan doesn’t spin freely, or if blades are loose, professional repair may be necessary.

4. Loose or damaged components

Sometimes, the loud noise can be attributed to something as simple as a loose screw or a damaged internal component.

Potential issues:

• Loose screws or mounting brackets
• Damaged stirrer blade
• Worn-out door hinges

Easy fixes: 

1. Carefully inspect the exterior of your microwave for any loose screws.
2. Tighten any visible loose screws with an appropriate screwdriver.
3. Check the door hinges for smooth operation.
4. If internal components seem to be the issue, it’s best to consult a professional.

5. High voltage diode failure

The high voltage diode works in tandem with the magnetron. When it fails, it can cause a loud humming noise.

Potential issues:

• Faulty diode
• Electrical issues

Easy fixes: 

This is another issue that typically requires professional attention. However, you can:

1. Unplug the microwave and plug it back in after a few minutes.
2. If the noise persists, it’s time to call a technician.

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When to DIY and when to call a professional

While some microwave issues can be resolved with simple DIY fixes, it’s crucial to know your limits. Microwaves contain high-voltage components that can be dangerous even when unplugged. Here’s a general guide:

Safe for DIY:

• Cleaning the turntable and support
• Tightening external screws
• Checking and cleaning the door seals
• Inspecting for visible damage

Call a professional when:

• The noise persists after trying simple fixes
• You suspect issues with the magnetron or other internal components
• There’s any sign of electrical problems
• You’re uncomfortable opening the microwave casing

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Preventing future microwave noise issues

Prevention is always better than cure. Here are some tips to keep your microwave running smoothly and quietly:

1. Regular cleaning: Wipe down the interior after each use to prevent food buildup.
2. Proper use: Avoid running the microwave empty and use microwave-safe containers.
3. Avoid slamming: Close the door gently to prevent damage to hinges and latches.
4. Ventilation: Ensure proper airflow around the microwave to prevent overheating.
5. Prompt repairs: Address minor issues quickly before they escalate.

Did you know that most microwaves have a silent mode? Our article tells you All About Microwave Silent Mode

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Understanding when it’s time for a replacement

Sometimes, especially with older models, repairing a noisy microwave isn’t cost-effective. Consider replacement if:

• Your microwave is over 10 years old
• Repair costs approach 50% of the cost of a new unit
• You’ve had multiple issues in a short period

When shopping for a new microwave, look for energy-efficient models with good user reviews regarding noise levels.

Looking for a quiet microwave? In this article we reviewed 6 of the quietest microwaves.

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Getting to the root of the issue

A noisy microwave doesn’t have to be a permanent kitchen feature. By understanding the common causes and knowing which issues you can tackle yourself, you can often restore your microwave to its quiet, efficient self. 

Remember, when in doubt, it’s always safer to consult with a professional appliance repair service. They can accurately diagnose the problem and provide a safe, lasting solution.