17Residual heat indicatorThe residual heat indicator with 1 indicator lamp is loca-ted between the two front cooking zones. The lampcomes on in case the temperature of switched on coo-king zones will reach more than (abt.) 60 oC. Also afterswitch--off the lamp will remain on until cooling down ofthe corresponding cooking zone.Pots and pansDo not put pots on the cooking surface unless their bot-toms are clean and dry. Avoid heating up of empty ves-sels.Do always cook with the potlid closed.Pots and pans bottoms might have burrs or edges thatscratch and scour the ceramic surface, when the ves-sels are moved around.This is as well guilty for pots and pans made of cast ironand for enamelware vessels that have an electro--gra-phitized bottom.Scratches may also appear, if e.g. grains of sand (leftfrom the preceding cleaning of vegetable) get on thecooking surface, when the pot is moved around on it.Dishes with aluminium and copper bottoms may leavemetallic discolouration on the ceramic glass surfacewhich is only hard to remove or even not at all.Intelligent consumption of energyTo save energy you should ...D exclusively make use of suitable boiling and roastingvessels with smooth and even bottom.D on principle put on pots and pans before theswitch--on of the cooking zone.D put on pots and pans always with the lid on.D switch off the cooking zone some minutes before theend of cooking time in order to make use of the resi-dual heat.D make use of the residual heat of the cooking zonesfor warm--keeping.Pots and pans must not be smaller than the cooking zo-ne itself. They should not exceed the cooking zone dia-meter by more than 2-4 cm either.Only use vessels that have a smooth bottom.After use make sure that the appliance is swit-ched off. All rotary knobs must be set to theOFF-position.residual heat indicator