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Fan for microwave oven

Your microwave oven has a Fan problem ?

The part is broken and the appliances doesnt work?

The fan is used to cool the inside of the microwave, especially the magnetron.
It may fail, stop rotating or not work as well.
Elements may then heat up and malfunction. A faulty fan may also make an abnormal noise.

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Here are examples for partial reference for microwave oven :

Where to find the reference?