e cooking fan of the electronic components is on. The induction hob gives a light whistling out.•Normal. According to the working frequency of the inductors, alight whistling can occur when using several cooking zones onmaximum power. Cooking zones that do not maintain a rolling boil or a fastenough frying rate.•You must use pans which are absolutely flat.•Pan bottoms should closely match the diameter of the heat zoneselected. This appliance is marked according to the European directive 2002/96/EC on Waste Electrical and Electronic Equipment (WEEE). By ensuring this product is disposed of correctly, you will help prevent potential negative consequences for the environment and human health, which could otherwise be caused by inappropriate waste handling of this product. The symbol on the product indicates that this product may not be treated as household waste. Instead it shall be handed over to the applicable collection point for the recycling of electrical and electronic equipment Disposal must be carried out in accordance with local environmental regulations for waste disposal. For more detailed information about treatment, recovery and recycling of this product, please contact your local city office, your household waste disposal service or the shop where you purchased the product. AFTERCARE Before calling out a Service Engineer please check thefollowing:— that the plug is correctly inserted and fused;If the fault cannot be identified:switch off the appliance — do not tamper with it — call the AftercareService Centre. The appliance is supplied with a guaranteecertificate that ensures that it will be repaired free of charge at theService Centre. If there are still some stubborn stains:-Place a few more drops of specialised cleaning fluid on th...