My Mt Vernon AE is acting up. When I plug the unit in I get the wake up screen then the standard temp screen. The upper left just shows "-----" and the unit does not autoclean. The thermostat does not react to any open door sensors. I can use the menu and change settings. The "pellet" menu option when entered is now blank. No pellet types are listed. Any ideas? I am 100 miles from a dealer and 1400 miles from where I bought it.