Thanks for the question.
When you close the door can you hear a slight click from the door switch.
You can check the door switch and then check this thermal fuse the door switch will cause this and so will this thermal fuse the fuse is in the control
You can turn off the power and join the two wires together and try the unit if it starts up replace the door switch, also take the bottom panel off and check the small metal box where the 120 volts connects to the unit look for a burnt wire if no burnt wire in that box and the door switch is ok then the thermal fuse is what you should replace.
Thanks and God Bless.