Kemmpi Minarc Evo 150 shut off when welding and show number 9 in the display

Hi.
I have a Kemppi Minarc EVO 150 that sometimes when welding just shuts off and in the display it says 9.
Then I have to restart it and could work as it should for a long time.
When put power on I hear a buzzing sound but goes away if I weld. And it is not the fan.
I open it and it looks like the buzzing sound comes from this transformer (see attached picture). Should it be like that or have that something to do with the code 9?
Does anyone have a diagram for this machine that matches my variant?
There is a sticker on the board that says W004932 F and W0049013330 (03.10.11)

Calibration must be performed. There is no code 9, the welder enters anti-stick mode.

espero que te sirva...