Bosch HBL 73 Service Manual page 25

OVEN MODEL SELECTION SINGLE
This operation is normally executed at the manufacturer facilities.
If the display board has to be replaced, the oven model must be
reconfigured. There is only one single part number for the display
board then, after having replaced it, also a single oven is
configured as a double oven 30" Multifunction/Multifunction.
IMPORTANT: ALWAYS KEEP PRESSED START KEY AT
FIRST POWER-UP ON A SINGLE OVEN, UNTIL THE
CLOCK IS DISPLAYED.
Otherwise, the control will try to run the latch auto-test but,
missing one cavity, it will never be able to complete it. At first
power-up, the control realizes that one cavity is missing: the
display shows a calibration error message. Ignore it and proceed
with the...
MANUAL TEST ACCESS PROCEDURE
1. Press CANCEL key.
2. Turn the knob 4 detents CW.
3. Turn the knob 6 detents CCW.
4. Press START key.
5. The writing MANUAL TEST is displayed.
OVEN