Too answer my own post, I removed the
microwave from its built in wood
cabinet and attempted to remove the
metal "jacket." They used Torx screws
with a non-tamper post in the middle of
the screw. I then drilled out a Torx
bit, but had to heat it up to remove the
temper. Once I had the tool, it was
easy. There was an envelope inside with
a schematic and a troubleshooting
guide. I found an open sensor. They
call it a "flame sensor," which senses
the temperatue of the top metal ceiling
of the oven. The document said it
was a non-resettable sensor. Until the
appliance parts place opens on
Monday, there is now a piece of metal
bypassing it. I know, we will NOT
let it run unattended like today until
the sensor is replaced.

Art Todesco wrote:
Funny this appeared just now. A few minutes ago, the microwave
was cooking and apparently (don't really know) was programmed
with way too large time. Anyway the food burned. I stopped the
oven with no problem. Everything seemed ok, however, after about
5 minutes I heard a click and the display blanked out. Everything
right now, is still hot. Do high temperature sensors self reset? This
is a GE Profile built in.

wrote:

My mom's Kenmore built-in microwave oven die recently.

My understanding is that the two common causes of
microwave oven failure are a blown fuse and and a
failed high-temperature sensor.

Didn't see a fuse in this one, though maybe there is
one way in the back, would a built-in typically have
a separate fuse or just rely on the house circuit breaker
like most other appliances?

I removed the temperature sensor from the top of
the oven. This is the high-temp safety switch, not
the food temperature sensor. Am I correct to
assume that if it is functional it will be normally closed?

As they say on the net, thanks in advance.