Originally Posted by cvstrat
Stop what you are doing and take a gravity reading
If it's lower than when you pitched, your yeasties are alive and well. If after 72 hours it's the exact same... well wait another day and try again. If by then it's still the same you screwed up and would probably wanna repitch.
+1,000 to this....if by "activity" you mean airlock, then stop relying on it as a "fermentation gauge," It's NOT it is only a release valve to vent off excess co2 to keep from painting your ceiling.
Airlock bubbling, lack of airlock bubbling, stopped airlock bubbling, fast airlock bubbling, slow airlcok bubbling, heavy metal airlcok bubbling, or disco airlock bubbling really is not an indicator of what is happening to your beer.
I have 9 different fermenters and have been brewing for a few years, and OVER HALF OF MY BEERS NEVER HAVE ANY BUBBLING IN THE AIRLOCK AND THEY ALL TURN OUT FINE!
Fermentation is not always "dynamic," just because you don't SEE anything happenning, doesn't mean that anything's wrong, and also doesn't mean that the yeast are still not working dilligantly away, doing what they've been doing for over 4,000 years....
If you've oxygentated, and pitched plenty of yeast, then you SHOULD reach your yeast attenuation, and get close to the final gravity.....that is all that is important...NOT whether or not you airlock goes "blip" or "Rattattattatta!!!!"
In fact many no longer use airlocks at all, just cover the hole with a piece of tinfoil, or use a piece of plexiglass instead of a lid.
Read this for why airlock analysing is useless, and what is the only gauge of ferementation...http://www.homebrewtalk.com/1217925-post3.html
And there is a link to my blog in there as well....
The only way to truly know what is going on in your fermenter is with your hydrometer.
Like I said here in my blog, which I encourage you to read, Think evaluation before action
you sure as HELL wouldn't want a doctor to start cutting on you unless he used the proper diagnostic instuments like x-rays first, right? You wouldn't want him to just take a look in your eyes briefly and say "I'm cutting into your chest first thing in the morning." You would want them to use the right diagnostic tools
before the slice and dice, right? You'd cry malpractice, I would hope, if they didn't say they were sending you for an MRI and other things before going in.....
So ignore your airlock, ok???? It's fun entertainment to watch, but doesn't mean anythings wrong if you don't see it happening.
Today is just barely at the 72 hour mark. More than likely your yeast being cold meant that it was dormant, and would need AT LEAST 72 hours to wake up and start working. Additionally if your temp was hot (but below boiling which would kill your yeast) and your yeast was cold, you may have SHOCKED your yeast, which of course would mean some lag time to contend with.
But you won't really know what's happening UNTIL you check "under the hood."