Bosch HGG223120E Instruction Manual page 18

Hotplate controls
Setting
þ
Off position
›œ
Settings range
Ignition button
18
You can use the four hotplate controls to control the
heat output provided by each hotplate.
Function/gas burners
Off
Large flame = highest power
Economy flame = lowest power
At the end of the settings range there is a limit stop.
Please do not turn the knob beyond this stop.
This is the button that activates the electronic ignition
system.
When the button is pressed, a spark will be produced
by all the burner igniters simultaneously.