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| There are two burners with two rings (inner and outter), and two burners with just one ring; but I don't see any buttons on the cooktop whatsoever. There does not appear to be anything on the knob panel either. | |
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There are different systems how you can activate the outer ring.
a) Turn the knob of the to the highest position and then a tad more. You will hear a faint click. (If you hear a load click you used to much force

)
Single ring burnern knobs will turn from highest directly to off.
b) There is a special button for this burner.
c) Or you have fancy one with a single magnetic knob to control everything. Activate your burner and the press on the button next to the on/off button.
d) RTFM or post the model so we will do it for you.