Originally Posted by Punx Clever
If it thawed completely, there should be no change in ABV or sweetness.
Was there a lump of ice in the carboy?
I had trouble with my temperature controller on my keezer and froze my kegs solid a couple of times (I've fixed it).
As long as you let the beer thaw completely
there is not a change to the ABV.
I let my beers thaw and they were fine.