I just bought my Pit Boss and from the beginning the Controller knob won't change the cook temperature. It doesn't make the cooking temperature blink or anything. The cooking temperature is set at 350 degrees and I have been using it that way while I try to figure out why I can't change it. I have downloaded the App and I don't see how to change the cooking temperature by using that either and I thought I read somewhere that should be possible also. Otherwise the grill powers on and operates normally as far as I can tell, I just can't change the cooking temperature. Any suggestions?