It probably has a shorted cook relay and is microwaving whenever the door is shut. You should unplug it until it is fixed.
I can normally repair this for $54.95, which includes insured return shipping.
Feel free to contact me via http://www.microwavecontrol.com
Time for a new microwave! Service fees start at $50 just to look at it, not including repair parts. Sounds like the power supply is dying, and would cost at least $50. So go find a brand new $100 microwave, and save yourself the time!
SOURCE: Magnatron suddenly making more noise. Much louder
Often over the years the Transformer laminations can loosen, from the on/off rising and collapsing magnetic fields, and then they sorta hum louder. I suspect this is what is going on. Shouldn't be too much of a worry.. keep an eye on it tho.
Testimonial: "Thanks. Should I replace the magnatron?"
SOURCE: My microwave is making a constant loud noise
Hi,
Here
is a tip that will help you to figure out what is wrong with your
Microwave Oven....
Basic Microwave
Oven
Troubleshooting Tips
heatman101
SOURCE: Our KitchenAid microwave works well, heats food,
hi it could be a bad neutral connection on your plug or inside on your high voltage transformer check the plug for burning and try plugging it in a different socket
Hi,
Here
is a tip that will help you to figure out what is wrong with your
Microwave Oven....
Basic Microwave
Oven
Troubleshooting Tips
heatman101
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