The problem was in fuse +24V in operator panel.
In photo you will see the panel. Screw 16 pcs from back side and in right bottom corner there is fuse in input board 2A.
this fuse was broken and none key was active in operator panel.
The message alarm "OIL COOLER FLOW ALARM 2031" was only the FIRST error in table of errors and we can see only one alarm at once.