Bosch Evolution 300 Series Service Manual page 51

The fault codes in the Tech Sheet example on the previous page DUH H[SODLQHG LQ JUHDWHU GHWDLO EHORZ
Note: Fault codes are not a foolproof system. Never assume that a part has failed based on a displayed fault code. )RU example if the control
module is displaying F30 (2pen 6ensor), the failure could be caused by a loose connection or faulty wire harness between the control module and
sensor or the sensor could simply be unplugged.
F10 will be displayed by the control module whenever it detects higher
than normal resistance from the oven temperature sensor. This condition
is usually associated with extrememly high internal oven temperature
indicating that the oven burner or element does not shut off creating a
"runaway" oven condition.
F10 can also be displayed when the oven is completely cold. This is
considered to be a false error code. To diagnose a false F10 code
disconnect the harness connector at the control module that has the two
purple wires. Using an ohmmeter measure the resistance between these
two wires. If a normal resistance range of 1080 - 1110 ohms is present
then the sensor and harness are good and the failure is caused by a
defective control module. Note that this test is only conclusive if the F10
code is present at the time the test is performed.
If the F10 code appears intermittently when the oven is not in use or is
not severely overheating then the failure condition is most likely caused
by a weak connection in the sensor harness connector or plug. The
sensor connector plug and range harness connector plug can be cut out
and the wires connected directly to eliminate the failure condition.
F10
F11 is displayed when the control module detects a stuck or shorted
keypad switch. F11 can be caused by intentionally holding down any
control keypad for more than 30 seconds.
F11 can sometimes be displayed if the temperature sensor circuit
develops a "bleed" or short to chassis ground of the range. To check
for this condition disconnect the harness connector at the control
module that has the two purple wires. Using an ohmmeter measure the
resistance between each of these violet wires to a ground screw or bare
metal surface on the range. This test should reflect an open circuit or
infinite resistance. If any continuity is detected the temperature sensor or
wiring harness may be the cause.
If the sensor circuit is open when performing the above test then the
failure is caused by a defective control module.
F12 & F13 DUH displayed to indicate internal errors in the control
module. These codes can sometimes be caused by power surges,
line voltage fluctuations or other issues in the incoming power supply.
To troubleshoot an F12 or F13 code disconnect the range from the
power source for 30 seconds. If the failure code returns when power is
reapplied then the control module is defective and must be replaced.
F11
F12 & F13
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