– 41 –
(
Continued Next Page
)
Convection Heater Assembly and Thermistor
The convection heater assembly is located behind
the rear cover and is composed of an inner and
outer fan blade, motor, heating element, and
thermistor assembly. Three Phillips-head screws
and 4 tabs hold the rear cover in place.
Upper Thermal Sensor
Lower Thermal Sensor
Convection Heater Assembly Shown with
Rear Cover Removed
Thermistor
Assembly
The thermistor assembly is connected to the
power board at location CN9. The thermistors
have a negative coef
fi
cient. As the temperature
increases, the thermistor’s resistance decreases.
Th
e approximate values at room temperature are:
Red - Blue = 400K
Ω;
Red - White = 290K
Ω;
Blue -
White = 110K
Ω.
Convection Heater Element
The convection heater assembly is held in place
by two 7-mm hex-nuts and 4 Phillips-head screws.
The convection heater element has an approximate
resistance value of 6 to 12
Ω
. Two Phillips-head
screws connect the power wires to the element
terminals.
The oven must be removed from the cabinet or wall
opening to access the convection heater assembly.
(See
Oven Removal / Partial Removal
.
)
Thermistor Assembly
The thermistor assembly consists of two separate
thermistors (thermal sensors) attached to the
convection assembly by a single Phillips-head
screw. The upper thermistor (blue and white wires)
is used for thermal compensation and more control
in a higher temperature range (above 300°F) for
Speed Cook, Broil, Toast, and Convection. The lower
thermistor (red and white wires) is used for more
control in a lower temperature range (below 300°F)
and is used for Proof and Warm.
