How do I manually light the burners during a power failure?
Turn all burner control knobs to the OFF position first, then hold a match at the ports and turn the control knob to the HI position. Wait until the flame is burning all the way around the burner before adjusting the flame to the desired height. Note that the automatic reignition feature will not work during a power failure. (Page 5)
From the official Bosch NGT73, NGP73, NGT93, NGP93 Gas Cooktops manual, page 5
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