CNC slotting machine which coordinate system is different from general CNC milling machine because Slotting machine which tool direction is face to operator.
The parameter #41 and #42 set 0 are right , Please change the two parameters setting to original setting 0 ,Use MPG to move the X axis and Y axis then check the X/Y/C direction plate on right corner on the rotary table , While you move X axis by MPG , The table will move right under you face machine condition , Y axis move Y+ , the table move forward.
As for why machine can not execute Home , the reason is you change parameter #41 AND # 42 , So happen the alarm , Please change back parameter #41 and #42 then execute Home again. (Please download the video from below dropbox link for above instruction.)
And attached is photo of coordinate system.