As soon as I try a bag of popcorn, about 4 seconds in it makes a loud buzzing sound that does not stop. I turned it off, I tried a glass of water and it was fine, has been ok for three weeks or so. Now I just tried two strips of bacon and it happened again. No arcing or flashing just the noise.
Check your waveguide cover / spatter shield for grease or food particles. It may be arcing.
To help you further (with free advice), I would need to full model number and FCC ID number from the label on / in your microwave.
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SOURCE: Microwave buzzing and hot when not in use
The brand and model number can help us pinpoint it, but it sounds as though it is cooking.
It also sounds like the cooling fan is not running durng this error condition, which could overheat and destroy the magnetron.
I would suspect a bad door switch or door switch mount, or possibly a stuck relay on the control circuit board.
Please reply back with your brand and model so we can help further. Thanks.
SOURCE: Microwave won't heat/Makes buzzing noise.
The symptoms you are describing are typical of a magnetron that has gone bad. Continuing to attempt to use the oven in its current condition can cause further damage. So, I would recommend not using it. Microwave ovens are considered dangerous and repairs should not be attempted by anyone that is not electronic saavy. The High Voltage Network inside the oven has voltage potentials of 14,000 volts and higher. If you feel this is something you wish to attempt, the Magnetron part number is 1156751 and costs approx. $158. Keep in mind, if the magnetron has been arcing and making a burning smell you may have burned the protective coating that lines the walls of the waveguide. If the waveguide is damaged it is not repairable. I do not know if this is a replaceable item on your model microwave. Double check your warranty information and/or owner's manual. In many cases the magnetron is warranted for several years beyond the limited warranty that comes with most appliances. Post back with comments and let me know if you want me to assist you further. In addition, if you provide me with your EXACT model number (located along the door opening) I can narrow down parts a little better. I know this all sounds discouraging, but I do hope I have been able to help you.
SOURCE: Kitchenaid builtin microwave buzzing
I would recommend changing the diodes as well. This will usually take care of the problem.
SOURCE: Kenmore microwave making loud buzzing sound.
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SOURCE: ge spacemaker microwave JVM1330BW002 making noise, food not warm
bad news I am afraid. the heart of the unit has had a coronary and needs a tech to intervene
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