Siemens HB280 Series Operating Instructions Manual page 7

Temperature selector with indicator light
50 280 = Temperature in ºC
Radiant grilling
S = low grill
SS = medium grill
SSS = high grill
The indicator light comes on when you switch on
the temperature selector. It goes out when the
temperature you have set is reached and comes
back on when the oven starts heating up again.
The light does not come on during grilling.
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