Vapor escape!!!!

[Cookingupsomething]

So I ran my 12 gallon mash at 177 degrees. Speed was several drips then a stream. Every time right before the stream a small amount of vapor escaped. Water never got above 45 degrees F. Pump is pumping 264 GPH. Condensor is very cold to the touch. Using a heating element controlled by a PID. I backed off the temp and the still shutdown. What simple thing am I messing up. I'm a beginner