If your microwave quit running, it is likely because of a bad fuse. Microwaves are equipped with a fuse, which has a wire enclosed in ceramic housing. When the unit overloads, the fuse wire burns, but it saves important parts from damage.
It is possible to fix this yourself, however; you must exercise caution, since microwaves use higher voltage than other appliances. Replace the fuse by following these tips.
Prepare to Replace the Fuse
To replace the microwave fuse, gather:
Don't work on microwaves with jewelry and watches, which could snag on electrical components. If you are unsure of your skill at any time during the replacement, take the unit to an appliance repair service.
Clean moisture from the microwave with a cloth, and disconnect the power cord. Sometimes, cords may be threaded through an under cabinet model. Let the unit stay disconnected about fifteen minutes.
Locate the Fuse
Most fuses are located under the top grille. Detach the screws on the vent grille with the screwdriver, remove the grille, and set parts aside. You may need to open the door to reach the grille on some units.
Older microwaves could have a fuse box located under the bottom rear plate. Use a screwdriver to detach the screws, remove the plate, and follow the cord to the main electrical connections. If you are uncertain of the main electrical connections, check your manual.
You may need to remove the control panel. Look for the control panel screws, remove them, raise the panel, and move it forward to loosen it. Label the wiring, or snap a photo of it, and remove the control panel from the microwave.
Replace the Old Fuse
When you locate the fuse, check for voltage using the voltmeter to ensure it is the fuse that failed. A reading of other than 0 or close to 0 means the fuse has blown. A blown fuse may also turn black on the inside and have a melted wire, and sometimes, a blown fuse shows no signs of damage.
Fuses should easily come out of the holder, but be careful to not bend the clips. Use pliers or a fuse puller to detach stuck fuses, if needed.
Use the old fuse as a guide to buy two or three replacements, and insert it into the slot. If the fuse won't slide into the slot easily, wrap a screwdriver tip with a cloth, and lightly scrape the fuse ends and the slot. Reinstall the grille and control panel, then test the microwave.
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