A microwave can spark inside for a few different reasons, and it doesn't always mean that the appliance has a major problem. You may see a brief flash when heating food, especially if there is metal, foil, food residue, or an issue with a part inside the microwave. However, repeated sparking should not be ignored, as it can damage the appliance if you continue to use it.
In this article, we'll explain why is your microwave sparks inside, what you should check when it happens, and when it needs professional repair.
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Why Is Your Microwave Sparking Inside?
Let's first look at the reasons why your microwave sparks inside and what could be causing it:
Metal or Aluminium Foil Is Inside
If you have placed a spoon, steel container, aluminium foil, or a plate with a metallic rim inside the microwave, you may see bright flashes soon after switching it on. Metal reflects the microwave energy and can cause arcing, especially when a sharp edge is close to the microwave wall.
The Food Has Burnt Onto the Cavity Wall
Small food splashes may not seem like a problem, but burnt grease and food particles can become hot spots inside the microwave. If you keep using the appliance without cleaning them, you may eventually notice sparks coming from the same area.
The Microwave Is Running Empty
Switching on a microwave without food or liquid inside can cause problems because there is nothing to absorb the microwave energy. Even a short empty run can create conditions that lead to arcing or damage to internal components.
The Waveguide Cover Is Damaged
The small cover inside the microwave, often found on one of the side walls, protects the waveguide opening. If it has burn marks, cracks, holes, or heavy food residue on it, you may see sparks coming from that area when the microwave runs.
The Inside Wall Has Burn Marks or Exposed Metal
Look closely at the spot where the sparks appear. If the cavity has chipped paint, deep scratches, rust, or a blackened patch, the exposed or damaged area can become a point where arcing occurs. Repeated use can make the damage worse.
A Metal Rack Is Positioned Incorrectly
Some microwave models come with a metal rack that is safe to use only in specific modes or positions. If the rack is not designed for microwave use, touches the cavity wall, or is used incorrectly, it can produce sparks during operation.
A Container Has a Metallic Edge or Decoration
A container may look like ordinary glass or ceramic but still have a thin gold, silver, or metallic border. That small decorative strip can spark when exposed to microwave energy. If the sparks appear only with one particular plate or bowl, stop using it in the microwave.
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What Should You Do When Your Microwave Sparks?
Once you notice microwave sparks inside, here are a few things you should do and a few things you should avoid:
Stop the Microwave Immediately
Press the stop button as soon as you see sparks. Don't leave the microwave running to see whether the sparking stops on its own. If the sparks continue, switch the appliance off and unplug it if you can do so safely.
Clean Food and Grease From the Cavity
Once the microwave has cooled, check the inside walls, ceiling, and floor for dried food, oil, or sauce splashes. Wipe away any residue with a soft, damp cloth, especially around the area where you noticed the sparks.
Check the Container for Metal
Look at the container you were using when the sparking occurred. Check for aluminium foil, metal handles, gold or silver decoration, or other metallic parts. If you find any, don't use that container in the microwave.
Check the Turntable
Make sure the glass tray sits correctly on its centre support and rotates freely. If your model has a roller ring, check that it is also in the correct position.
Check the Metal Rack
If you were using a metal rack, check the microwave manual to confirm whether it is suitable for the cooking mode you selected. Don't use it during microwave heating if the manufacturer does not approve it for that mode.
Don't Run the Microwave Empty
Don't switch on the microwave without food or liquid just to see whether the sparks return. This can create further arcing and may damage the appliance.
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When Should You Call a Professional?
By now, you have seen why microwave sparks inside and what you can check at home. Here are some signs that the microwave needs professional attention:
The Microwave Runs but Doesn't Heat
If the microwave starts normally and the timer counts down, but your food remains cold or takes much longer to heat than usual, don't keep running longer cycles to compensate. The appliance may have a fault that requires professional inspection.
The Sparking Returns With Safe Cookware
If the microwave still sparks when you use suitable cookware and there is no visible food or grease inside, stop using it. At this point, the sparking is unlikely to be something you can fix through cleaning or changing the container.
You Smell Burning While It Runs
If you notice a burnt electrical or plastic smell during operation, switch the microwave off. Don't continue another cycle to see whether the smell goes away, particularly if the smell comes from the appliance rather than the food.
The Microwave Trips the MCB
If the MCB trips when you start the microwave, don't keep resetting it and trying again. Leave the appliance switched off and have the electrical fault checked.
The Microwave Makes an Unusual Sound
A new loud hum, buzz, crackle, or grinding sound along with sparking is a reason to stop using the appliance. A technician can check the source without you having to open the microwave yourself.
The Problem Returns After Cleaning
If you clean the cavity, remove unsuitable cookware, and follow the basic checks but the microwave still sparks, don't keep testing it. Repeated sparking means the appliance needs a closer inspection rather than another round of home fixes.
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Why Choose Eazzy for Microwave Repair?
Once it's clear that your microwave needs professional repair, the next step is choosing a repair service you can rely on. Here's what Eazzy offers:
Doorstep Repair Service
There's no need to carry your microwave to a service centre. A technician visits your home, checks the appliance, and carries out the required repair on-site whenever possible.
Detailed Microwave Inspection
Before starting the repair, the technician checks the microwave to find what is causing the problem. The inspection can cover the magnetron, waveguide cover, turntable system, control panel, door switches, and other relevant components.
Compatible Replacement Parts
If a component needs replacement, the technician uses a compatible part that matches your microwave model. This helps ensure the part fits correctly and works with the existing appliance.
Complete Microwave Testing
After the repair, the microwave is tested to check heating, the turntable, controls, door operation, and other functions. This helps confirm that the appliance works properly before the service is completed.
Upfront Pricing
The estimated repair cost is shared before the repair starts. This gives you a clear idea of the charges in advance, with no unexpected costs after the service is complete.
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Final Thoughts
To sum up, when a microwave sparks inside, it doesn't always mean there is a serious problem, but repeated sparking should not be ignored. We have covered the common reasons, the steps you can take at home, and the signs that indicate your microwave needs professional repair. If the sparking continues after the basic checks, Eazzy can inspect the microwave, identify the problem, and carry out the required repair.
