Microwave Fuse Replacement: Get Your Microwave Heating Again

If your microwave suddenly stops heating, the most common culprit is a blown fuse. It’s cheap, easy to test, and you can replace it yourself in under an hour. In this guide we’ll walk through the signs that point to a fuse failure, the tools you’ll need, and a step‑by‑step how‑to that keeps you safe and gets the job done.

When a Fuse Is the Problem

First, make sure the issue is actually the fuse and not something else. A microwave with a blown fuse usually shows these symptoms:

• Turntable spins but nothing gets hot.
• Display lights work, but the magnetron stays silent.
• Microwave makes the usual humming sound, then stops.
• Power cord feels warm or you smell a faint burnt odor.

If you notice any of these, unplug the unit and open the rear panel (or the bottom if your model hides the fuse there). Look for a small glass or ceramic cylinder about an inch long – that’s the fuse. A blown fuse will have a broken filament or a darkened interior.

How to Replace a Microwave Fuse Safely

Here’s a quick rundown of the replacement process. You only need a screwdriver, a multimeter (optional but handy), and a replacement fuse that matches the exact rating printed on the old one.

1. Unplug the microwave. Even if you’re just swapping a fuse, the high‑voltage capacitor can hold a charge for minutes.
2. Remove the outer screw covers. Most models have three to four Phillips screws on the back or bottom. Keep them in a small bowl so they don’t roll away.
3. Locate the fuse. It’s usually mounted on a small metal bracket near the power cord. Take a photo before you take it out – it helps you remember the orientation.
4. Test the fuse (optional). Set a multimeter to continuity mode. Touch the probes to the metal ends; a beep means the fuse is still good. No beep confirms it’s dead.
5. Swap it out. Gently pull the old fuse from its holder and insert the new one, matching the orientation you photographed.
6. Re‑assemble. Screw the panel back on, plug the microwave in, and run a quick test with a cup of water for 30 seconds.

If the microwave heats now, you’ve saved a repair bill. If it still doesn’t work, the magnetron or wiring may be at fault, and calling a professional is the next step.

Replacing a microwave fuse costs about £5‑£10 for the part, plus a few minutes of your time. No need to hire a technician for a problem you can fix yourself.

Remember to always disconnect power before working on any appliance. Safety first, savings second – that’s the rule for every DIY repair.

Got a different microwave issue? Our site has guides on troubleshooting ovens, fridges, and more. Stay tuned and keep your appliances running smoothly.