Some common reasons:
If turntable does not move at all--a safety switch where the door opens may cause this.
Other primary reasons are:
Bad Diode most units use or the large Filter cap some use.
Bad inverter which powers the Magnetron that does the heating and connect to each other.
A bad magnetron in the unit.
Typical diode used
Typical Magnetron
Posted on Dec 17, 2012
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.
Hi,
Here is a tip that will help you to figure out what is wrong with your Microwave Oven....
Basic
heatman101
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