Microwave oven won't work

Shelia, A lot of microwaves do have internal fuses, Links below will show how to change them.
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How to Fix Microwave Oven Simple Fuse Replacement

Microwave Won Work GE Microwave Thermal Fuse Replacement part WB27X1127

Microwave Line Fuse Replacement Whirlpool Microwave Repair Part W10422951

see the details and fix it. God bless you
Touchpad and Control Panel If the microwave buttons don't work the touchpad and control panel assembly are probably defective.

Touchpad If the microwave buttons don't work the touchpad might be at fault. Generally speaking, if the dishwasher display is working and some of the buttons respond correctly but some don't, the problem is with the touchpad.

User Control and Display Board If the microwave buttons don't work the main control board is most likely defective and will need to be replaced.

Main Control Board If the microwave buttons don't work the main control board is most likely defective and will need to be replaced.

see the details and proceed according. fix it. God bless you
Main Control Board If the microwave buttons don't work the main control board is most likely defective and will need to be replaced.

Main Control Board If the microwave buttons don't work the main control board is most likely defective and will need to be replaced.

Main Control Board If the microwave buttons don't work the main control board is most likely defective and will need to be replaced.

Touchpad and Control Panel If the microwave buttons don't work the touchpad and control panel assembly are probably defective.

There are three common issues, the magnetron "heats food" a cracked high voltage diode, a shorted high voltage capacitor.

Chances are good that you have a bad door switch.

You can find helpful exploded view diagrams and order parts by entering your full model number here.

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My Whirlpool/Roper microwave/hood combo has the same problem. I replaced the bulb twice, checked the bulb and it works, but not in the microwave. I wrote to Whirlpool asking about the problem. Haven't heard from them yet.

have fuses inside checked ..... also elements.with a volt meter

remove the outer cover and its in a fuse holder on the right side of unit get the right amperage

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There function is prevent the oven to work whit the door open
some are normally close and some normally open when one of then don’t work properly causes a short and blow the main fuse check the all and replace the faulty one but be careful and don’t test the microwave
Whit the cover removed.

Note:
if you have a blown fuse buy several emplacement fuses because my take several trays to fix the problem and you will need more than one fuse.

Replaced with different microwave. Amanna microwave works fine on both circuits. Would not recommend Whirlpool for RV use.

Thanks