My Tassimo maker red light has been on for a year now. I finally found the descaling product that works for this machine. It worked like a charm, yahoo. No more red light. Now for those of you who don't know how much water to use or how to set it to clean I can help.1.) pull the water reservoir out and retrieve the yellow disk from the back of the machine and place it in the top of the coffee maker (like you are making a cup of coffee.2.) take the insert that contains the water filter out of the water container and set aside.3.) in a measuring cup add two (one pack) of descaling tablets with 17oz of hot water and let dissolve4.) pour into water reservoir and replace it back on the machine.5.) use a large cup to catch water, close lid containing yellow disk and press and hold button for 3 to 5 second, green and red light will start flashing, let it work its magic until the light tells you the reservoir is empty, wash reservoir, refill with 17oz of clean water and repeat cleaning cycle.6.) red light should go out. now just put filter part back into the main reservoir, fill with water and just run a single cup of coffee through the machine. this will clean all chemicals out of the machine.7.) replace yellow disk in back of machine and you are ready to go.It may seem like a lot, but it only takes 20 minutes of your time. If you need more info or don't have the book let me know and I will be glad to help you.