Microwaves are complicated appliances, plus they can be a challenge to repair, for experienced DIY'ers. However, there are several repairs that may be performed to keep your microwave running properly. For example, a microwave fuse is a component that commonly needs replacing, and with a little know-how and the right tools, you can install a new one to fix your appliance.
Safety Warning
Because of the high voltage and high current used by microwave ovens, be aware that repairing this appliance poses a substantial risk for injury or death if precautions aren't taken. You should always unplug the microwave before you attempt any disassembly. Since high voltage capacitors utilized in microwaves may retain electric power charge even after the microwave has been unplugged, we recommend that only experienced professionals access and replace internal components.
What kind of fuse do you need to replace?
A fuse is definitely an electrical device that prevents too much current from passing with an electrical circuit. These are usually sacrificial components, and therefore they are damaged after being tripped and can't be re-used. Microwaves usually contain several kinds of fuses for safe operation. A primary fuse or line fuse is a fuse that will cut the flow of electricity if an excessive amount of current passes through it. Conversely, a thermal fuse may prevent electrical flow if the fuse is heated to a specific temperature.
Testing a Fuse
Before you replace a fuse, it is a good idea to test the part to make sure it is actually the cause of your problem. Use a multimeter to test the part for continuity. A continuity test will determine if a continuous electrical path is present in the fuse. Before you begin, ensure the microwave is unplugged, consider high voltage capacitors used in microwaves may retain a charge even after the oven continues to be unplugged, it is recommended to discharge the capacitor before servicing. You can do this be placing a screwdriver blade across each set of capacitor terminals. You should avoid touching the blade when doing this.
Once you have removed the fuse in the microwave, touch the probes of the multimeter to each terminal of the part. If the meter reading shows zero ohms of resistance, the fuse has continuity. When the meter's needle does not move, or the digital display does not change significantly, there isn't any continuity, which means the fuse has blown and can need to be replaced.
Be aware that the failure from the fuse often indicates that there's a shorted electrical component in the microwave, like a failed door switch. This part will also need to be replaced, or the fuse will continue to fail.
Replacing a fuse
If you determine that the fuse is faulty, the next thing is to replace the part. Just like testing, be sure that the microwave is unplugged prior to starting the repair. The first step from the procedure will depend on your type of microwave. If your fuse is situated behind the control panel or vent grille, you might be able to access it without taking out the microwave from its installation. You will have to remove the grille or user interface to access these fuses. If you cannot access the fuse you need from behind these panels, you will first need to uninstall the appliance. This can usually be achieved by removing 2 or more screws from the top of the microwave, then lowering it and lifting them back a mounting bracket. Place it on a sturdy surface, and you are clearly ready to continue.
Next, you will need to take away the outer cover to reach the interior components. Fuses are located in many places inside the microwave, including the top, side, and behind the vent grille. Using the wiring diagram can help you locate the right fuse. Once you have located the fuse, remove any necessary wires and fasteners to free it in the microwave.
To replace the fuse, connect any necessary wires towards the new part, and secure it with any clips or fasteners if necessary. Replace the panels or covers and secure all of them with the screws. If applicable, carefully put the microwave on the mounting bracket, then align it using the cabinet, making sure the power cord is accessible through the top. Secure the screws, plug the microwave in, and test the appliance to make sure its in working order.
Find the right microwave parts with Repair Clinic
To find the appropriate fuse for your microwave, simply type your model number into the Repair Clinic search bar. We feature parts for all major brands, so you'll be able to keep your appliance running great, regardless of problem. You can also visit our repair help section for videos and articles that can further assist you in your repair.
