The All Off cooktop touch control turns off the downdraft exhaustsystem and all surface cooking areas that are in use at the sametime.The Lock cooktop control avoids unintended use of the surfacecooking areas. When the cooktop is locked out, the surfacecooking areas cannot be turned on by the cooktop touchcontrols.To Lock Cooktop: Touch and hold the ALL OFF/LOCK keypadfor 4 seconds. After 4 seconds, ALL OFF/LOCK will glow red,indicating that the cooktop controls are in the lockout position.To Unlock Cooktop: Touch and hold the ALL OFF/LOCK keypadfor 4 seconds.The surface cooking area will glow red when an element is on,except when Melt or Warming Zone (on some models) are used.It may cycle on and off to maintain the selected heat level.It is normal for the surface of light colored ceramic glass toappear to change color when surface cooking areas are hot. Asthe glass cools, it will return to its original color.Cleaning off the cooktop before and after each use will help keepit free from stains and provide the most even heating. Oncooktops with light colored ceramic glass, soils and stains maybe more visible, and may require more cleaning and care.Cooktop cleaner and a cooktop scraper are recommended. Formore information, see "General Cleaning" section.• Avoid storing jars or cans above the cooktop. Dropping aheavy or hard object onto the cooktop could crack thecooktop.• To avoid damage to the cooktop, do not leave a hot lid on thecooktop. As the cooktop cools, air can become trappedbetween the lid and the cooktop, and the ceramic glass couldbreak when the lid is removed.• For foods containing sugar in any form, clean up all spills andsoils as soon as possible. Allow the cooktop to cool downslightly. Then, while wearing oven mitts, remove the spillsusing a scraper while the surface is still warm. If sugary spillsare allowed to cool down, they can adhere to the cooktopand can cause pitting and permanent marks.• To avoid scratches, do not slide cookware or bakewareacross the cooktop. Aluminum or copper bottoms and roughfinishes on cookware or bakeware could leave scratches ormarks on the cooktop.• Do not cook popcorn in prepackaged aluminum containerson the cooktop. They could leave aluminum marks thatcannot be removed completely.• To avoid damage to the cooktop, do not allow objects thatcould melt, such as plastic or aluminum foil, to touch any partof the entire cooktop.• To avoid damage to the cooktop, do not use the cooktop as acutting board.Use cookware about the same size as the surface cookingarea. Cookware should not extend more than 1/2"(1.3 cm)outside the area.A. Surface cooking areaB. Cookware/cannerC. Y2" (1.3 cm) maximum overhang• Use flat-bottomed cookware for best heat conduction andenergy efficiency. Cookware with rounded, warped, ribbed ordented bottoms could cause uneven heating and poorcooking results.• Determine flatness by placing the straight edge of a ruleracross the bottom of the cookware. While you rotate the ruler,no space or light should be visible between it and thecookware.Make sure the bottoms of pots and pans are clean and drybefore using them. Residue and water can leave depositswhen heated.To avoid damage to the cooktop, do not cook foods directlyon the cooktop.ACDA. Vent grilleB. Filter support tray (non-removable)C. Removable grease filterD. Ceramic glass topThe downdraft ventilation system consists of a vent cover, filterand vent fan. The downdraft ventilation system removes cookingvapors, odors and smoke from foods prepared on the cooktop.IMPORTANT: For optimal performance, operate the downdraftventilation system with the filter properly installed.To avoid the buildup of grease, the filter should be cleaned often.For more information on proper filter placement and cleaning, see"Downdraft Ventilation System" in the "General Cleaning"section.