I filled a bucket with 5 gallons of water to use as a base when tweaking the the screw with a floating thermometer. This gave me an accurate reading of what it will be like when I put in my fermenter bucket with the real stuff
It could be the compressor wasn't coming on because it was still warming up to the kick-on point. You will definitely need a thermometer to dial it the correct settings. I would recommend using thermometer in water to get an accurate reading. A thermometer reading the air temp won't be as accurate.
Good job on figuring out where the screw was located!