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You didn't say which model you needed. I believe if you gop to this link and select the model you have. You will be able to open the manuel and it will tell you the codes. Kuppersbusch Coffee Machine Manual
Someone onCoffee Geek had this to say and it sounds like it could be the same problem:When I first got my machine--a steal from a fellow barista friend for $40!--It had been sitting dry for about 18 months, and I had the same problem with the pump. After trying some things myself, I eventually called the manufacturer's help line and was told I needed to manually prime it. I used a little squeeze bottle full of water to slowly fill the intake tubing with water and turned on the machine and opened the steam/hot water valve which turned on the pump. After some stuttering, it caught and has been fine ever since. So yes, I would recommend manually priming and then running water through the pump, boiler, and steam wand until all air is out of the system. Hopefully that will fix you up.
1. Soak the steam wand in some hot water for a few minutes 2. Using a cup at the bottom run the brew function and open up the steamer valve until it starts pulling water through. May take a bit of time. Be careful with the steam.
Hope this helps my white profi of 12 years has been acting up and will not even turn on.