Originally Posted by te3b0r
Cooling mode yes at least as far as I know it is set to HC but as far as differential not 100% sure controller is set to 34 to freezer is set to the second dot before 1 not sure what temp that is to be 100% honest.
"HC" is the heating or cooling menu. You enter that menu and then choose either H for heat, or C for cool. The "D" menu is where you set the temp differential. If you haven't accessed the menus at all except to change the set temp, then it should be set to cool mode with a small temp differential, so it should be working. Have you tested to see if the relay is closing?