It was the red wire going to the heater relay. I just got done cleaning the ducts and blower wheel and they weren't bad at all. If it was a surge can't you something cheap before the control board? Also how about just putting in a new relay? They're under 5 dollars at mouser. I've been searching for information about this for the last few days and all I found is buy a board, and nothing about preventing it. I only found one post about someone replacing it and it worked. Thank you for your replies.