Solution to same problem
DO NOT SHOUT. It is rude and offensive.
Remove the CCU (Climate Control Unit), and resolder all button connections to circuit board.
Do a search, all instructions have been posted many times.
Good Luck, and post the success story.
1999 Porsche 996 Carrera Convertible
1994 420E - SOLD
1986 300E - SOLD, what a car