Frozen Cider in Keg! WHAT THE HELL HAPPENED???

[WarEagleBrewer]

So, I just went out to my shed with my nifty "we don't need no stinking beer gun" rig to bottle my wife some of her apple cider (9% apfelwien diluted with apple juice to 5%). I took the keg out of the fridge, disconnected the line to the faucet, purged the tank, connected the "beergun" line, and turned the gas back on. As I started filling the first bottle, I got a lot of foam....and then nothing! I knew it wasn't empty......so i purged the keg and opened the lid......FROZEN SOLID! One big ice cube of frozen cider. It's like it happened instantly. The other keg of 6% beer I have in the fridge still flows like normal. WHAT HAPPENED???

 

[jsprinceiii]

What is the temperature of the Fridge?
Would also be interesting to take temperature reading of sample from the keg.

 

[WarEagleBrewer]

The fridge temp is at 40F. I can't get a sample from the frozen keg, obviously, but i will go check the other one. Back in a min.

 

[WarEagleBrewer]

The beer in the other keg reads EXACTLY 40 degrees Fahrenheit. It's almost like I somehow flash froze the contents.....

 

[jsprinceiii]

Your 5% cider should not freeze until around 29 or so degrees.
Does it sit next to the "fan/vent" that provides the cold air in the fridge?

 

[WarEagleBrewer]

Eh....I don't think so, although i've never really looked that closely.

 

[jsprinceiii]

Only thing I can think of is there has to be a cold spot/section in the fridge where that keg sits.

 

[WarEagleBrewer]

Aaaaaand here's my sign. Would you hold it for me? I went back out to put a cup of water in the fridge overnight to see if it froze.....and saw the fridge was set to the absolute coldest setting possible. It's not digital, just plastic turn dial.....so out of curiosity, I checked the other keg.....yup, it's frozen too. I can settle for stupid as long as I'm not crazy. Thank you for sending me back out there to check it out. I'm going to rest my brain now.

 

[jsprinceiii]

Glad you found what happened.