I've been having some issues with my kegerator of my beer not getting cold enough. Originally it was an old GE dorm fridge that I bent the freezer compartment back, when I did that I think I broke the thermostat because the thing would run constantly. I bought a digital temperature controller to fix this issue and hung the probe in the middle of the fridge to get the ambient temp. I then set it to 40 degrees with a dp/dt of 2. When I went to pour a beer after 2 weeks of carbing I get little head with some "fizzing" kinda like coke. I'm serving at 12 PSIG, which got me thinking, maybe the beer isn't cold enough and co2 isn't getting in solution. So I poured a pint and measured the temp of the beer at 50f. Anyone know what's going on? Why isn't my beer at 40? And why is my beer undercarbed? Thanks for the help in advance!