Microwave Blown Fuse – What It Means and How to Fix It

If your microwave stopped heating or clicks but never runs, a blown fuse is often the culprit. The fuse is a tiny safety part that stops electricity from reaching the magnetron when something goes wrong. When it blows, the microwave protects itself, but you’re left with a dead appliance. The good news is the fuse is cheap and you can replace it yourself if you follow a few simple steps.

How to Spot a Blown Fuse

First, make sure the microwave is unplugged. Safety always comes first. Look for these signs:

  • The microwave turns on but won’t heat.
  • It makes a clicking sound when you press start.
  • You see a burnt smell or a small pop noise.

These symptoms usually point to a fuse problem, but they can also mean a broken door latch or a failed magnetron. If you’ve ruled out a loose door, the fuse is the next thing to check.

Replacing the Fuse – Step by Step

You’ll need a few tools: a screwdriver set, a small flat‑head screwdriver, and a replacement microwave fuse that matches the part number on the old one. Most microwaves use a 125 V, 5 A fuse, but double‑check the label.

  1. Unplug the microwave and move it to a clear workspace.
  2. Remove the outer cabinet screws – usually three or four on the back.
  3. Carefully lift the outer cover. You’ll see the fuse near the power cord or on the main board.
  4. Take a photo of the wiring layout. This helps you reconnect everything correctly.
  5. Use needle‑nose pliers to pull the faulty fuse out of its holder.
  6. Insert the new fuse, making sure the metal tabs fit snugly.
  7. Replace the cabinet cover, tighten the screws, and plug the microwave back in.
  8. Test the unit by heating a cup of water for a minute.

If the microwave works, the fuse was the problem. If it still won’t heat, another component has likely failed and you should call a professional.

Replacing a fuse usually costs under £10 for the part and a few minutes of your time. If you’re not comfortable opening the microwave, a local repair service can do the job for about £40‑£60, including labour.

Remember, microwaves contain high‑voltage capacitors that stay charged even after unplugging. If you’re unsure about any step, it’s safest to let an expert handle it.

In short, a blown fuse is a common, inexpensive fix. Check the signs, follow the simple steps, and you’ll have your microwave back in action without a big bill.