Testing and Replacing the Ceramic Fuse in Your Microwave

Ceramic fuses are the most commonly used type of fuse found in electric household appliances, which in most cases means that your microwave-oven probably has one. The use of ceramic fuses is so popular thanks in part to their ability to ensure that an electrical surge is unable to harm the inner components of the microwave.

While protecting the microwave, a fuse can sometimes blow or melt which could be due to many causes, including a short circuit caused by severe voltage fluctuations. In most cases, the fuse will just simply need to be replaced, which the information in this article will show you how to do. If you feel uncomfortable at any time while working with the electrical portion of this job, don’t hesitate to contact a professional repairman to take a look for you.

Here are the tools you will need to grab in order to properly get started:

  • Voltmeter/ ohm meter
  • Fuse Replacement
  • Dry Cloth
  • Rubber or Plastic Gloves
  • Pliers

Step #1: Find the Ceramic Fuse Holder

First things first, put on your gloves and ensure that the surface is dry before beginning working. Turn off the main power supply and unplug your microwave, and turn the unit around to access the back portion. Some microwaves have dedicated fuse boxes of their own. Either way, you will need a screwdriver to remove the metallic plate that covers the electrical components of the microwave.

Step #2: Locate the Fuse

Remove the ceramic fuse from it’s holder using a screwdriver. If it gets stuck in place, use pliers to make it move however, don’t press too hard so you don’t harm the fuse. This is where you will need to use your VOM to test the fuse to see if it is blown.

Test the metallic ends of the fuse using the testing probes of the voltmeter. A normal reading will be zero so if it reads infinity or a higher number instead, the fuse is more than likely blown and needs a replacing.

Step #3: Replacing the Fuse

All you need to do to replace your ceramic fuse is simply place a new one into the same slot you found the old one in. If it doesn’t fit, try cleaning the area and then trying to fit it in the ceramic holder again. This can be done by placing a dry cloth over the working end of a screwdriver.

Now put the microwave’s cover back on, remembering to put the screws back in their proper place, and your ceramic fuse has been replaced.