Page GB-9The hobOperating principle of aninductive hobLocated beneath the glass ceramic surfaceis a coil, through which current flows. Thiscoil generates an alternating magnetic field.This induces eddy currents in a metallic potplaced above it, which heat up the metal ofthe pot and from there, heat the contents ofthe pots through heat induction. The induc-tion currents thus make the pot itself a heattransmitter. Although the surface of the glassceramic hob heats up, this is not as a resultof the electric field, but as a result of the heatthat emanates from the pot.Induction technology has two main advantages:– Since heat is generated exclusively in thepot, maximum heat utilization is ensured.– There is no heat inertia effect: The cookingprocess begins as soon as a pot is placedon a cooking zone, and it ends when thepot is removed from the cooking zone. Inthis way, the cooking process is much fast-er, which saves energy.Noises generated when usingthe hobInduction-heating technology relies on theproperty of certain metals, which vibratewhen high-frequency waves are applied tothem. Under certain circumstances, these vi-brations can cause some slight noise. Noneof these sounds arise from any technicalfault, nor do they indicate poor quality. Theyare simply related to the induction technolo-gy. They will have no negative impact on thepots or the hob.Possible noises:– Deep humming sound similar to that of atransformerThis sound may occur when a high heatsetting has been selected. The cause ofthis is that a large amount of energy is trans-ferred from the hob to the cooking device.The hobThe sound will disappear or be reduced assoon as the heat setting is reduced.– Slight whistlingThis sound may occur when an emp-ty cooking device is placed on a cookingzone. It disappears as soon as water orfood is placed in the cooking device.– CracklingThis noise may occur when cooking devic-es made of layers of different materials areused. The noise is caused by vibrations atthe joints of the different material layers.This noise occurs in the cooking deviceitself. The sound may change dependingon the type and quantity of the food beingcooked.– High whistling soundsThese noises may arise primarily withcooking devices that are made of differentmaterials and specifically in the event thatthese materials are used at maximum heatsetting on two adjacent cooking zones. Thenoise will decrease as soon as the heatsetting is reduced.– WhirringWhen cooking on the induction hob, a slightwhirring noise may arise depending on thepot, the fill level or the temperature. Withsome pots, this noise may only arise whilethey are heating up, and with others, onlyonce they are warm; in some, the noise willarise only when the fill level is very low andin others, only when they are completelyfilled. The noise may be continuous or mayoccur at intervals. It can occur in the samepot on one cooking zone, but not on an-other. Even when using the same pot onthe same cooking zone, the noise maynot occur every time. It may occur when aspecific pot is in a certain position on thecooking zone – and may not occur againthe next time.