
To program the water hardness level on your Melitta LOOK Perfection Filter Coffee Machine and prevent limescale, follow these steps: First, press and hold the CALC button for more than two seconds until it begins to flash. The machine will initially flash the CALC button four times with pauses, indicating the default high water hardness setting (level 4). Next, tap the CALC button briefly to cycle through the options: one flash, two flashes, or three flashes (each followed by a pause) to select your desired water hardness level. Finally, save your chosen setting by pressing and holding the CALC button for over two seconds. Remember, you cannot adjust the water hardness while the machine is brewing, and your selected setting will be retained even if the power cable is disconnected. Properly setting the water hardness level is key to the longevity and efficient operation of your Melitta LOOK Perfection coffee machine, ensuring it continues to deliver the perfect brew.


