It's not RAMPS or MOSFET, since the LCD controller uses the same electronics to control the heaters as the PC . . . this is either firmware, or Repetierhost, and I tend to favor the latter . . .
What happens if you send gcodes to the printer directly, and not using the Repetierhost functions? And what do you get back from the printer from either attempt? Any chance you just aren't connected, or does movement work?
- Tim
Edited 2 time(s). Last edit at 10/25/2015 12:02AM by tadawson.