Thermal Cutout (Tco's); Oven Thermal Cutout(Flame Sensor); Hood Thermal Cutout - Frigidaire PLMV178HC Service Manual

6-8 Thermal Cutout (TCO'S)

There are 4 different thermal cutouts in this unit with 4 different purposes. They are :
1. Oven thermal cutout (flame sensor), on cavity top.
2. Hood thermal cutout, inside control area on duct.
3. Bottom thermal cutout, on floor of control area.
4. Magnetron thermal cutout, on magnetron.

6-8-1 Oven Thermal Cutout(Flame sensor)

The oven thermal cutout(Cavity TCO) is located on
the top side of the oven cavity beside exhaust duct
with a temperature rating of 212°F(100°C) and is non-
resetable.
The cutout is tightly held to the top of the oven cavity by
a spring clip.
NOTE : If cutout cannot be removed from clip oven will
have to be removed from installation and outer
case removed.

6-8-2 Hood Thermal Cutout

This cutout will protect the touch control from excessive
heat by turning the vent fan on at low speed. If the
surface units of the range are used for long periods of
time heat will build up and could damage the microwave
control. In order to prevent this a thermal cutout is
installed on the duct behind the control. This cutout
will close (158°F/70°C - vent fan energized)and open
(104°F/40°C - vent fan de-energized) depending on
temperatures it sense.
To Remove hood Thermal Cutout :
1. Disconnect power and remove grille.
2. Remove control box assembly.
3. Remove two wire leads and unscrew one
screw capturing cutout on duct.
NOTE : It this cutout were to open it would be difficult
to detect. The only time it functions is during
an overheat condition. It will be normally open
when checked with an ohmmeter.
BOTTOM
THERMAL CUTOUT
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OVEN THERMAL CUTOUT
HOOD
THERMAL CUTOUT