I have Ultimaker 2 Extended and It was working perfectly, until the filament broke while printing. I aborted the print and went to change the filament. I removed the Bowden tube and the printer turned off then on again (Electric Short). Now every time I turn on the printer the extruder heats immediately very fast until I get a max temp error.
I checked the thermocouple and the heater wires everything is connected from both ends. I tried the factory reset and noting happened, now I can't check anything or use the LCD screen because I need to do the initial setup but I can't because the heating is faster than the setup steps