Welcome to Heavy Equipment Forums, cerg. One of our Forum Rules is that English is the official language of Heavy Equipment Forums. I was able to translate the title of this thread, and also each of your posts, as seen below. Going forward, can you please post in English. Thanks. Translation of posts: "Hello.Tell me, error 3990 ." "Thank you!" "For those who are interested, by mistake 13015 the drum did not drop, I shot a video." "The file is large and does not load. In a nutshell, the drum control unit has fallen off, from vibration, resistance, through which the solenoid valve is controlled by lowering the drum."