Stupid Beer Fridge

[gregzz4]

The beer fridge in my office/sump room has been freezing pop, juice and beer for months. It hasn't really been a concern and I've been gradually turning it down from its max of 7 to recently 3.
This last Thursday I came home to this



The culprit


After cleaning out all the coke residue I turned it down to 1.
Friday it was still too cold so I took the controller cover off (to get the part #) and visually turned it down as far as it would go without turning it completely off.
Well, obviously this was too much.
This morning I walked into my office and stepped on a wet carpet. The fridge had completely defrosted


I now have a thermometer inside and am adjusting as needed until I can find a replacement controller.