My smoker is about 3 years old and used often. I have had very few problems with the smoker before now.Ignore the above poster, he is a spammer. Avoid that website.
Call 1-877-303-3134 and leave a call back number.
You are not the only one with this issue. If you do a search here you can find other threads about the same thing.
How old is your Pit Boss? If it is new there is a possibility of wires being crossed. I am sure others who have had this issue will chime in.