Jumped R/W wires at thermostat , nohelp
See this causes and proceed. God bless you
Magnetron
If the microwave is loud or noisy only when
cooking, the magnetron tube might be defective. The magnetron uses high
voltage, high current DC power to generate the microwave frequency that
cooks the food. Under normal circumstances the magnetron is nearly
silent. However if it is damaged or nearly burned out it can begin
emitting high pitched or growling noises. It's not normally dangerous to
use a microwave oven when it makes these noises, but they are an
indication that the magnetron is almost dead and will need to be
replaced.
Exhaust Fan Motor
If the microwave is loud when running the fan motor might be
Stirrer Motor
If the microwave is loud or noisy the stirrer
motor might be worn out. The stirrer is a metal blade which slowly
turns around, deflecting the microwave energy in a random pattern inside
the microwave oven. As the motor nears the end of its useful life it
begins to make grinding noises. The microwave will not heat food evenly
without this stirrer, the motor should be replaced.
Turntable Motor
If the microwave is loud or noisy the
turntable motor might be worn out. This is a common problem and
relatively easy to replace.
Investigate these three areas if your microwave won't heat but you hear a loud buzzing or humming noise:
Power Diode
A diode is an electronic component that readily
passes current in one direction only and blocks the flow of current in
the opposing direction. If your microwave's diode has become defective,
your microwave will not heat and you will hear a buzzing noise. Test the
diode to determine if this is the cause of your problem. Replace it if
it is defective.
High Voltage Capacitor
A capacitor is an electrical device which stores
electricity. A defective capacitor may be why your microwave is not
heating but you are hearing a buzzing or humming noise. The capacitor
will have to be tested to determine if this is the cause of your
problem. A defective capacitor will have to be replaced before your
microwave will work again. Make sure you discharge the capacitor before you test it, though.
Magnetron
A defective magnetron is the third possible cause of
why your microwave is not heating, but you can hear a buzzing noise.
Test your microwave's magnetron. Replace it if it is defective.
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