Why Is My Microwave Making a Popping Noise? 

Noises are usually produced whenever you use a microwave. However, you should never hear loud popping coming from your microwave unless you’re making a fresh batch of popcorn. Popping can indicate potential issues from faulty microwave components and can even pose a safety hazard if left ignored. 

Is your microwave making a popping noise during operation? Here’s how to identify where the popping noise is coming from and how to fix the problem in a safe and effective manner. 

Why Do Microwaves Make Noise? 

Microwaves can be a variety of noises. These are usually from the cooling fan, the rotating turntable, loose parts, the magnetron, or the food being cooked inside the microwave. You may notice:

• A low humming or buzzing 
• Soft whirring 
• Steady rattling or clicking 
• Crackling as the food cooks 
• Soft sizzling or popping 
• Grinding vibrations
• Thudding or clunking if there are loose parts 

Most of these noises are generally not a cause for concern especially when you can easily pinpoint where it’s coming from. But if you notice unusual noises that weren’t present before, or an increased frequency or level of noise, this could point to deeper issues at hand.  

Normal Microwave Noises vs Abnormal Microwave Noises 

A normal functioning microwave will always produce a certain level of noise. You can expect to hear a faint whirring or humming sound while in operation, with sounds coming from the rotating turntable, microwave fan, and magnetron. You may also hear some faint sounds as your food is cooking, including it shifting around or soft crackling as it warms up. 

Generally, popping, grinding vibrations, thudding, and noticeable clicking all indicate abnormal noises, especially if you haven’t heard those noises being produced before. And if these loud noises are accompanied by strange smells or signs of visible damage, it is a clear indicator that your microwave will need to be repaired or replaced. 

For popping noises:

• Normal: If you’re microwaving food with a high water or fat content. Test this by microwaving a small, empty, microwave-safe bowl to see if the popping still occurs.
• Abnormal: If the popping is accompanied by light flashes or sparks, or occurs even during the bowl test, this could indicate a potential issue. 

How To Fix a Microwave That’s Making a Popping Noise 

We cover the most common causes of popping noises in your microwave and how you can fix them to get rid of the noise quickly. 

1. Check The Interior For Debris 

Your microwave should be wiped down after every few uses and deep cleaned at least once every few months, especially if you’re using it a lot. Sauce spills, food scraps, and other debris produced from microwaving your meals can accumulate inside the microwave cavity and on the turntable. Over time, these scraps can repeatedly heat up and burn resulting in popping and crackling sounds. 

Carefully examine the inside of the microwave when it’s not in use. Remove the roller rig and turntable plate and soak them in warm and soapy water, scrubbing off hardened food debris with a bristle brush. Wipe down the cavity walls with a damp cloth and gentle detergent. 

2. Check The Fan 

The microwave fan is a crucial component of your microwave. It provides adequate airflow and ventilation and when it works properly, you’ll only notice a low whirring noise. A faulty or obstructed microwave fan can cause strange noises like rattling, grinding, or popping as the blades rub against each other. 

Unplug your microwave and access the fan. It’s usually located at the top back of the unit, underneath a metal cover or panel. Check your user manual for the exact location in your microwave. Carefully examine the fan blades for visible damage or obstruction from debris and spin the fanes manually, it should be smooth and free from obvious resistance. 

3. Check The Turntable 

An obstructed roller ring or turntable can cause rattling or other strange noises during operation. Ensure it is properly fitted every time you use the microwave as it can pop out of alignment often. 

Open the microwave and give the turntable a gentle spin. It should spin freely and without resistance, and the plate should fit snugly alongside the grooves of the roller ring. The roller ring may need replacing if there’s obvious physical damage or the ring makes noise when moved. 

4. Check The Magnetron 

The magnetron in your microwave generates the radiation needed to power operation. If it is faulty or malfunctioning, you may notice strange noises like buzzing or popping. 

A faulty magnetron is usually accompanied by other signs like a burning smell or irregular heating. Replacing a magnetron can be tricky as you need to safely handle the capacitor and disconnect wiring, so get help from a professional if you’re unsure how to proceed. 

When To Call a Professional like Flamingo

When dealing with electrical issues, wiring, or issues that pose a significant safety hazard, it’s better to be safe than sorry. Call a professional repair technician if you need help disassembling your microwave to check faulty components or if you need a professional to provide their input. In most cases, they will have the expertise and equipment needed to confirm the problem so you can get back to fixing it quickly. 

If your microwave is sparking or burning, cease operation immediately and unplug the microwave from the power source before contacting a professional. 

Final Thoughts 

Microwaves are generally a very low-maintenance kitchen appliance. So if you notice that your microwave has started to make loud popping noises during operation, it’s normal to be concerned. Luckily there are some simple DIY fixes you can do to identify and fix the source of the popping before it escalates, and without the need to contact a professional.