Be-safe, Un-plug your microwave oven ,
Open the microwave cover , Close and open door few times to check the door latch(es) and switch(es). Door switch assembly may has one or more micro switches.( Most switches are black or grey and about 1,25 in long X 3/4 in wide X 5/6 in thick with two or three wire connections). Making sure door latch close and open these micro-switches.
You can hear the switch "clicks" when small switch pin or lever is pressed.
Sometime these door micro-switches pin or lever get stuck or broken.
You can take couple pictures before remove wires or micro switches
You can buy these switches for about 3-7 dollars online. Some web sites have video showing how to check them. (Using Volt-Ohm meter)
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