I had the same issue, and Pit Boss is sending me a new control board, but... while I was waiting for the control board, which still hasn't arrived a week after the order was sent to the warehouse... I read somewhere else that this unit had to be brought to 225 degrees first and left that way for 20 minutes before increasing the temperature to 350 degrees. I wouldn't have thought that would be how the unit worked, but that approach did work. Once 225 degrees was reached and maintained for 20 minutes, thereafter I had no problem setting (and reaching) 350 degrees for the burn-off. This response is 7 months or so after your post, so I am sure that you have gotten around the issue by now, but if you haven't then this might work for you! Good luck!!Have a brand new series 3 electric smoker. The temp for the burn off is 350. Can't get above 260. Help???