This is most likely a dead magnetron (microwave production) or a dead transformer.
These are the most expensive bits of a microwave, so unless it is of sentimental value, a new unit is actually cheaper than a professional repair.
SOURCE: Microwave MMV4205aa
There
should be a "mini-manual" (tech sheet) hidden inside the unit
behind the
control panel or hidden on the left side behind the grille, which is
very helpful when troubleshooting, testing, and locating components.
At
our Web site, we have a video
available showing how to remove a typical
over the range control panel assembly in under 5 minutes.
If you don't find yours, or if you want to look at it without disassembling the oven, you can probably download it here.
You can find
helpful exploded view diagrams and order parts by entering your full
model number from the tag on the oven here.
Your problem is likely a blown fuse, a bad magnetron thermal cutout / thermostat, or a bad oven cavity thermostat.
Accessing some components for testing and possible replacement will require you to remove the oven from the wall.
If
so, the installation instructions are very handy, and it's best to have
two people since the microwave can be heavy and awkward.
You can
download Whirlpool / Amana owner's manuals and installation
instructions here.
We're
happy to help you with free advice and we'd appreciate your
thoughtful rating of our answer.
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