Bottom Thermal Cutout; Magnetron Thermal Cutout - Frigidaire PLMV178HC Service Manual

6-8-3 Bottom Thermal Cutout

THIS COMPONENT REQUIRE REMOVAL OF
MICROWAVE OVEN FROM INSTALLATION FOR
SERVICING.
During a fire on the stove the heat could be intense
enough to close the Hood Thermal Cutout and force the
fan to run. While at moderate high temperature we do
want it to run, however during a fire it is advantageous
to NOT have the vent fan running. So if a fire were to
start on the stove top the Bottom Thermal Cutout would
open at 248°F(120°C) and remove all power to the
microwave oven.
This cutout is designed to not be resetable.
To Remove Bottom Thermal Cutout :
1. Disconnect power and remove grille.
2. Remove control box assembly.
3. Remove two wire leads and unscrews one screw
capturing cutout on base plate.

6-8-4 Magnetron Thermal Cutout

The magnetron thermal cutout is located above the
leads to the magnetrons. It is designed to prevent
damage to the magnetron if an overheated condition
develops in the tube to cooling fan failure, obstructed
air ducts, dirty or blocked air intake. Under normal
operation, the magnetron thermal cutout remains
closed. However, when abnormally high temperatures
are reached within the magnetron, the magnetron
thermal cutout will open at 320°F(160°C) causing the
oven to shut down. After the temperature drops to 140°
F(60°C) it will reset and cooking will be able to resume.
To Remove Magnetron Thermal Cutout :
1. See 'Removing Magnetron'.
BOTTOM
THERMAL CUTOUT
MAGNETRON THERMAL CUTOUT
MAGNETRON
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HOOD
THERMAL CUTOUT