Microwave Replacement: When to Fix It vs. When to Buy New

When your microwave, a common kitchen appliance used for quick heating and cooking. Also known as a microwave oven, it's one of the most used devices in the home stops heating food but still turns on, you're left with a tough choice: repair or replace? Most people assume microwaves are cheap enough to just toss and buy new—but that’s not always the smartest move. A broken microwave isn’t always a lost cause. Sometimes it’s just a blown fuse, a faulty door switch, or a worn-out magnetron—all things a skilled tech can fix for less than the cost of a new unit.

But here’s the catch: not every microwave problem is worth fixing. If your unit is over 8 years old, the repair costs are close to half the price of a new one, or you’re dealing with recurring issues, it’s probably time for a microwave replacement, the process of swapping out an old or broken microwave with a new model. Older models also tend to be less energy efficient, so even if the repair works, you might be paying more in electricity over time. And if the door doesn’t seal right or the unit sparks inside, that’s not just inconvenient—it’s a safety risk. Microwaves with damaged door interlocks or leaking radiation aren’t worth gambling on, no matter the price tag.

Before you head to the store, check a few simple things. Does the light come on? Does the turntable spin? If yes, but nothing heats, the issue is likely internal—maybe the microwave fuse, a small component that cuts power if there’s an electrical overload is blown. You can test that yourself with a multimeter if you’re handy. If the microwave makes strange noises or smells like burning, stop using it. Those are signs of a failing magnetron or high-voltage diode—parts that cost almost as much as a new microwave. And if you’ve had the same unit for more than a decade, it’s likely nearing the end of its lifespan. Most microwaves last 7–10 years. Beyond that, parts become harder to find, and repairs get riskier.

When you do decide on a microwave replacement, think about what you actually use it for. Do you reheat coffee? Defrost meat? Pop popcorn? You don’t need a 1,200-watt model with 10 preset buttons if you only use it for 2 minutes a day. A basic 700–800-watt unit will do the job just fine and save you money upfront. Also, consider size. A countertop model is easier to replace than a built-in one, which might need professional installation. Don’t forget to check reviews for reliability—some brands have higher failure rates than others.

Below, you’ll find real-world guides on spotting microwave problems before they turn into hazards, how to test a blown fuse without calling a pro, and when the cost of repair tips the scale toward replacement. These aren’t theory pieces—they’re practical, tested tips from people who’ve been there. Whether you’re trying to stretch your budget or just want to avoid another broken appliance, this collection gives you the facts you need to make the right call—no fluff, no sales pitch, just what works.