Avoid using cold water since it could make the test results inaccurate. You may also use a microwave-safe plastic container if you don’t have a glass measuring cup.
If you don’t stir the water, you could get an inaccurate reading.
Check the microwave’s manual if you don’t know how to change the settings.
If the temperature doesn’t increase by at least 35°F (19°C), then the magnetron may be faulty and you will have to replace it.
If you have a microwave mounted over your stove, look inside of a cabinet above it for the outlet.
You do not need to remove the door or the button panel to access the magnetron. Organize the screws in small dishes for each side so you don’t lose them. Don’t touch any wires inside the microwave since they could possibly still have a charge. If you want, wear rubber gloves for an additional layer of protection.
Sometimes, the metal box with the capacitor has the image of a lightning bolt on it to mark that it’s dangerous. Avoid using an uninsulated tool to discharge the capacitor since you could seriously injure yourself. If you have trouble finding the capacitor, check the microwave’s manual or contact a professional repair person to help you.
Your microwave may have multiple magnetrons, so be sure to unwire all of them. Since you discharged the capacitor, the wires and components won’t have any voltage.
There may be other supports or baffles around the magnetron. Unscrew and remove them as well if they prevent you from pulling out the magnetron.
You can buy a multimeter from your local hardware store.
It doesn’t matter which prong you choose since the measurement will be the same.
Your magnetron still may not work properly even if it has a good filament, so keep testing it.
Make sure the leads don’t slip or come loose while you’re taking your measurement.
If the magnetron reads any resistance, the electrical current won’t be able to move through it as easily. You can buy magnetrons online or from appliance stores for around $35–100 USD.
