Microwave Fan Thermal Switch; Microwave Fuse; Microwave Flame Tco - GE ZEK957 Series Technical Service Manual

close at 140 °F, restoring function to the unit.
If the magnetron TCO has opened, check for fan
failure, obstructed air ducts, or dirty or blocked air
intake.

Microwave Fan Thermal Switch

Obtain access to the fan TCO by placing the
control panel in the service position.
Fan TCO
OPEN - 140 °F
CLOSED - 158 °F
A fan thermal switch is mounted on the microwave
baseplate. If, during lower oven use, the baseplate
should reach 158 °F, the fan thermal switch will
close, activating the magnetron fan. This will
assist in removing heat from the component
compartment.

Microwave Fuse

Obtain access to the fuse by placing the control
panel in the service position.
Warning: When the 20-amp fuse is blown due to
the operation of the monitor switch, the monitor
switch must be replaced. Also replace relays and/
or interlock switches when continuity check shows
contacts shorted.
A 20-amp fuse is connected to the line-in side of
the unit's circuitry and is common to all functions
Fuse
Fuse
and the door switches. If this fuse blows (open),
no functions will operate, including the display.

Microwave Flame TCO

The microwave must be removed from the oven to
service the flame sensor.
Flame TCO
OPEN - 240 °F
The flame TCO is a one-shot, nonresettable TCO
mounted to the left side of the oven cavity. In the
event the oven temperature reaches 240 °F, the
flame TCO will open, automatically shutting the
oven off. The flame TCO is connected to the line-
in side of the circuit.
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