I am having some trouble with my e3d v6 hotend. when I power up my board the full graphics LCD beeps and tells me that there has been a thermal runaway. Any help would be very welcomed.
Sounds like your temperature probe has failed.
They are very inexpensive.
Example:
Thanks. I will order a replacement but first I'm going to check if any wires are shorted.
Turns out there was a short in the heater block.