Is It Safe to Use a Sparking Microwave? Microwave Dangers Explained

A microwave is a staple of kitchen convenience, but when it starts acting up, it can be genuinely alarming. Seeing sparks, hearing strange noises, or smelling something burning can make you wonder if your appliance is about to become a major hazard.

Never ignore microwave warning signs. Here are some common microwave dangers and why a professional repair is the only safe solution.

The Danger of Sparks (Arcing)

If you see sparks or flashes of light inside your microwave, this is called “arcing.” It happens when microwaves (the energy waves) react with metal.

• Accidental Cause: You may have accidentally left a fork or a piece of aluminum foil inside. In this case, simply remove the metal object.
• Serious Cause: If there is no metal inside, the sparks are likely caused by a damaged interior. Chipped paint can expose the metal underneath, or a damaged waveguide cover (the small rectangular piece on the inside wall) can cause arcing.

Why it’s dangerous: Continuous arcing can permanently damage the microwave’s core component, the magnetron, and poses a significant fire risk. Do not continue to use a microwave that sparks on its own.

The Risk of a Broken Door

The microwave door is more than just a window—it’s a critical safety shield. The mesh screen and tight seals are designed to contain the microwave radiation.

• The Problem: A broken, cracked, or misaligned door latch can allow radiation to leak. While the levels are typically low, there is no safe level of exposure to microwave radiation.
• The Rule: If the door doesn’t close securely or the seal is damaged, stop using the microwave immediately.

Strange Noises and Burning Smells

A loud, unusual humming or buzzing sound, often accompanied by a burning smell, is a strong indicator that an electrical component is failing. This could be the magnetron, a high-voltage transformer, or a capacitor.

Why it’s dangerous: These components carry extremely high voltage, even when the microwave is unplugged. Attempting a DIY repair is incredibly dangerous and can result in severe electric shock.

Microwave Repair is Not a DIY Job

Unlike other appliances, microwaves contain high-voltage capacitors that can hold a lethal electrical charge long after being unplugged. For your safety, all internal repairs must be handled by a trained professional.

The licensed technicians at Appliance Surgeon have the expertise to safely diagnose and repair all types of microwaves, including countertop, over-the-range, and built-in models.

If your microwave is showing any signs of trouble, unplug it and call Appliance Surgeon for a safe, professional repair. You can also book an appointment online.