Temperature Sensor; 6.10 Control Module (Relay Board) And Daughter Board - Bosch 800 series Service Manual

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6.9

Temperature Sensor

The PT1000 temperature sensor is in the upper left corner of the
cavity, with two screws securing it. An ohmmeter can be used to
check the resistance of the sensor. Normal ranges (based on cavity
temperature) are shown in Table 7.
Table7 Normal resistance readings for temperature sensor

6.10 Control Module (Relay Board) and Daughter Board


NOTICE
More than 75% of the control modules returned to the factory are fully
functional. Before diagnosing a bad control module, be sure to
disconnect and reconnect each wire/wire harness.
The control module (and daughter board on double ovens) control the
elements, fans, door locks, lights, etc., regulate temperatures, and
monitor safety functions. The module(s) are also responsible for
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This material is intended for the sole use of BSH authorized persons and may contain confidential and proprietary information. Any unauthorized review, use, copying, disclosure, or distribution in any format is prohibited.
JANUARY 2018
communication with other modules, analyzing sensor data, regulating
line voltage, and managing user interface activities.
The control module and daughter board are accessible from the top of
the unit. Proceed to the Replacing the Control Module or Daughter
Board section if an HBL8742UCC, HBL8752UCC or HBL87M52UCC
is not being serviced.
 CAUTION
When servicing the lower HBL8742UCC, HBL8752UCC and
HBL87M52UCC wall oven component of a combination oven, only
the top front service access panel will be accessible without removing
the microwave oven
If additional access to the top area of the oven is required, the upper
oven component must be removed. To safely remove and reinstall
the microwave oven, two people are required.
If an HBL8742UCC, HBL8752UCC or HBL87M52UCC combination
oven component is being serviced, refer to Top Access:
Combination Models in the Component Accessibility section of this
manual for important instructions, then proceed to Step 4 in the
following section.
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Service Manual for Bosch 800 Series Built-in Wall Ovens
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