SOURCE: i have a kichenaid microwave#khms155lss-4 my son
It's most likely a blown magnetron thermostat, but you should also check the fuse and the oven cavity thermostat.
There should be a "mini-manual" hidden inside the unit behind the control
panel or hidden on the left side behind the grille, which is very
helpful when troubleshooting, & testing.
You can find helpful
exploded view diagrams and order parts by entering your full model
number here.
Accessing the thermostats 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 Kitchenaid / Whirlpool 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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