What does error 30 mean? How do I fix it?Updated a year ago

Error 30 is a Communication Error - Unplugged Wiring

The only cause of this error is an unplugged cord somewhere running from the LCD screen to the controller. 

The Fix: 

Follow the cable running from the LCD screen and ensure it is plugged in underneath the black wiring frame. Ensure plugs underneath the controller, and by the foot pedals are plugged in firmly.