Oven Temperature Sensor - Bosch Evolution 300 Series Service Manual

Oven Temperature Sensor 57'

The oven temperature sensor reacts to ambient temperature changes.
At room temperature the sensor resistance will measure approximately
1090 ohms. As the surrounding air temperature rises the resistance of
the sensor rises.
To test the sensor it is recommended to make the initial test at the
control module harness connector plug
Disconnect the plug from the control module and use an ohmmeter to
measure resistance between the two violet wires in the harness.
IMPORTANT: 90% of the temperature sensors returned to the
factory by field service technicians check good. Perform all
recommended sensor tests before replacing.
)LJXUH 1 at right shows the RTD scale found in the tech sheet that is
provided with the range. Use this scale to compare the resistance
measurement to the known oven temperature. If the resistance is within
the tolerance levels listed then the sensor and connecting harness are
not defective and need not be replaced.
If the resistance is significantly higher or lower than the RTD chart
indicates you should isolate the sensor from the harness and test the
sensor via the harness connector plug on the sensor itself (Shoto A)
When replacing a sensor, best practice is to replace the sensor complete
with connector harness and plug. Splicing is not recommended as it can
change the resistance value.
2:26
Harness
Connector Plug
RTD SCALE
TEMPERATURE °F
RESISTANCE Ω
32 ± 1.9
75 ± 2.5
250 ± 4.4
350 ± 5.4
450 ± 6.9
550 ± 8.2
650 ± 13.6
900 ± 13.6
FigXUH 1
Photo A
PROBE
1000 ± 4.0
1091 ± 5.3
1453 ± 8.9
1654 ± 10.8
1852 ± 13.5
2047 ± 15.8
2237 ± 18.5
2697 ± 24.4