17Water filterOperation with or without water filterYou can use the appliance with or without a water filter.It is recommended to install the descaling systemGF 111 700 if the water hardness exceeds 7°dH(carbonate hardness 5°dH).Change water filterFilter cartridges should be replaced regularly.Replacement cartridges are available fromafter-sales service or in the online shop(order number GF 121 710).The capacity of the filter cartridge depends on thefrequency of use of the appliance and your regionalwater hardness. A message will appear in the display toremind you when the filter needs to be replaced.Regardless of the actual amount of water filtered thefilter cartridge needs to be changed after 12 months atthe latest.1 Set the function selector to S. Select "Water filterchange" using the rotary selector.2 The œ symbol is displayed. Confirm with ™.3 Change the water filter. Refer to the instructionsincluded with the filter cartridge. Confirm with ™.4 "Select water filter capacity” is shown in the display.Confirm with ™.5 Turn the rotary selector to select the capacity of thefilter cartridge (between 100 - 9000 liters). Confirmwith ™.The water filter change is complete. Touch the ™symbol. The appliance is now ready for operation.Activating the applianceStandbyThe appliance is in the standby mode when no functionis set or the child lock is activated.The control panel's brightness is reduced in the standbymode.Notes‒ There are various displays for the standby mode.The GAGGENAU logo and the time are set bydefault. Refer to the section entitled Factory settingif you would like to change the display.‒ The display's brightness depends on the verticalviewing angle. You can adjust the display by way ofthe "Brightness" setting in the factory settings.Activate applianceIn order to exit standby mode, you can either▯ Set the function selector,▯ Touch a control panel,▯ or open or close the door.Now you can set the desired function. Read theappropriate chapters to learn how to set functions.Notes‒ If "Standby screen = off" is selected in the factorysetting, you must turn the function selector to exitthe standby mode.‒ The standby display appears again if you have notmade any settings for a long while after activation.‒ The cooking compartment lighting goes out after alittle while if the door is open.