Hello !
Why menu haven't this function (exactly works wrong), BUT in web-interface in Extrace->Powercontrol you can find "DeepStandby" button ?!
Right now I push this button and DB800 go to there:
No abnormal message on screen about "Now you can safe ....". Simply black screen as mast to be. And DM800 start to refrigerate.
Why this function don't use _right_ in menu ?!