To check a ceramic fuse, use an ohmmeter or continuity tester. With an ohmmeter or multimeter, you should see a reading close to zero ohms if the fuse is intact, or infinite if it’s blown. If a continuity tester indicates continuity when you touch its lead to the ends of the fuse, it’s good.
How many fuses are in a microwave?
Your microwave may have two types of fuse. The line fuses are usually familiar ceramic tubes, about 1¼ inches (3 cm) long. The thermal cutoff fuses are typically squat black cylinders with two prongs on the same side. Their exact location depends on your model, but check behind the control panel.
What causes a microwave to suddenly stop working?
The most common cause for a microwave oven not working at all is a blown main fuse. The microwave main fuse will cut the flow of electricity if too much current passes through it. There can also be thermal fuses, cavity fuses, and thermoprotectors which will interrupt the electrical flow if the microwave overheats.
How do I fix a blown fuse in my microwave?
How to Replace a Blown Fuse
- Disconnect the microwave from the power source.
- Remove the relevant access panel.
- Unscrew or unclip the fuse and remove it from the microwave.
- Test the fuse with a multimeter for continuity.
- If defective, replace the fuse with a new one that matches the fuse you removed.
Why would a microwave suddenly stop working?
How do you check if a fuse is blown?
Remove the fuse from its holder. In some cases you may need a small screwdriver to unscrew the fuse holder cap. Look at the fuse wire. If there is a visible gap in the wire or a dark or metallic smear inside the glass then the fuse is blown and needs to be replaced.
Will microwave turn on if fuse is blown?
In the most common scenario, your microwave will start up and run with no issue. This verifies that nothing that takes just 120 volts like your door switches and electronic control is causing the issue. WARNING: Do not attempt unless you have training in appliance repair.
What causes microwave to stop working?
How do you replace a fuse in a microwave?
In replacing a Sharp microwave fuse, the appliance must be unplugged and the back cover removed using a screwdriver. The fuse is a small glass cylinder capped with metal on either end; once it is disconnected from the wires holding it in place, it can be replaced.
How do you test a fuse with a multimeter?
Before you test a fuse with a multimeter, turn off the equipment and remove the fuse by pulling it straight out of its slot. Turn the meter to ohms, then touch the positive and negative leads together and check the reading. Next, put one lead on each end of the fuse and check the reading.
How do you test a thermal fuse?
Since you can’t tell if a thermal fuse has blown out simply by looking at it, you’ll need to perform a continuity test. A continuity test will determine if a continuous electrical path is present in the fuse. If the fuse has continuity, it should be functioning properly.
How to test a thermal fuse with a multimeter?
Set up Your Multimeter. Plug the test probe leads into your multimeter.
