[. . . ] Make sure that the lid is properly closed to prevent the kettle from boiling dry. 3 Place the kettle on its base, put the plug in the wall socket and set the on/off switch to 'I' (fig. The kettle switches off ('O' position) automatically when the water has reached boiling point. [. . . ] do not let the mains cord hang over the edge of the table or worktop. Never fill the kettle below the minimum level to prevent the kettle from boiling dry. HD4657 only: this rapid boil kettle has a power of 3100 watts and can draw up to 13 amps from the power supply in your home. Make sure that the electrical system in your home and the circuit to which the kettle is connected can cope with this level of power consumption. Do not let too many other appliances draw power from the same circuit while the kettle is being used. This is perfectly normal and does not mean that the kettle has any defects. Depending on the hardness of the water in your area, small spots may appear on the heating element of your kettle when you use it. This phenomenon is the result of scale build-up on the heating element and on the inside of the kettle over time. Although scale is harmless, too much scale can influence the performance of your kettle. Descale your kettle regularly by following the instructions given in the chapter 'Descaling'. Cleaning the kettle 1 Clean the outside of the kettle with a soft, damp cloth moistened with warm water and some mild cleaning agent. Scale is not harmful to your health but it may give your drink a powdery taste. The scale filter prevents scale particles from ending up in your drink. Models with a Triple-action filter have also been equipped with a mesh that attracts scale from the water. 2 The filter can be cleaned: by taking it out of the kettle and gently brushing the filter with a soft nylon brush under a running tap, or. For models with a triple-action filter (HD4657, HD4653 and HD4652): the mesh can be cleaned as follows: Remove the basket from the filter by sliding it out (fig. [. . . ] The table below indicates which filters are suitable for your electric kettle. If you need information or if you have a problem, please visit the Philips website at www. Com or contact the Philips Customer Care Centre in your country (you will find its phone number in the world-wide guarantee leaflet). [. . . ]