So you made your beer, pitched your yeast and there is one problem – it’s not working. As of late, there has been quite a few people saying that there fermentation isn’t working and there are no signs of fermentation to be seen. No reason to worry this can be easily fixed. There could be a couple things that have gone wrong and that’s why you are seeing any fermentation. So I have created a quick checklist on what to do if you see that your fermentation is stuck or did not start.
Check List
1) Wait 72 hours before freaking out…
A lot of people think that within just a few hours yeast should start percolating and that the air lock will be going nuts. That’s really not the case. Depending on the OG of the beer, what type of yeast your pitched and the temperature of fermentation you’ll get different results. I would wait up to 72 hours before making the assumption that something is wrong. After 72 hours of nothingness, then it’s time to start trouble shooting.

2) Is the lid down all the way?
If you are using a carboy it’s pretty easy to see if the bung is in all the way. If you are using a plastic bucket with a lid, sometimes the lid isn’t closed all the way. If it’s not, CO2 could be escaping from the crack in the lid making it look like no fermentation is taking place. So press down around the lid to make sure you have an air tight fit.

3) Did you cool down the wort before you pitched the yeast?
Sometimes you can be in hurry and you didn’t pitch the yeast when the wort was cool enough. This can kill the yeast. If you pitched your yeast above 80 degrees there is a good chance that the yeast is dead. It happens, a mistake that won’t be repeated I’m sure. The fix is that you need to pitch more yeast at room temperature.

4) How cold are you fermenting at?
Ales like it at room temperature. Room temperature is anything from 65-75. I would shoot for the middle of the road though, 70 degrees. If you are lower than that, you can expect that the results might take a bit longer. Also the start-up for fermentation will be slower and not aggressive. So if you are in the low 60’s (64-60) just know it’s not going to take off like a freight train. If you are fermenting a bit too cold, move it to a warmer part of the house, or put a heater next to it. If you don’t have a heater, just wrap a blanket around it.

5) Check air lock water…
Sometimes with the 3 piece air locks, water can actually hold down the center part of it. I would take off the air lock and then refill it and put it back on. Maybe you’ll see the middle part rise up.
6) Was it working ever and what was the OG?
Sometimes yeast will start to work and then just stops. This can be caused by yeast just falling out. Take the fermenter and rock it back and forth. If the yeast fell out, this will know the yeast back up and start fermenting again. Quick and easy fix. If you do that and nothing happens, it’s time to repitch yeast. If you had a beer with an original gravity of 1.080 or higher and you didn’t make a starter, you might have to repitch yeast to get a good fermentation.

7) Is it your first lager?
Lagers don’t act like ales, you can’t judge progress by the air lock. Lagers really are their own animal. We have a guide on how to make them and what to expect. If the answer to this question is, “Yes”, then it’s best to take a look at what to expect.
8) Check the gravity…
If the fermentation was going and then it stopped, this is an obvious one – check the gravity. There is a chance that the beer is just done fermenting. If you are fermenting a small beer with an OG of 1.035, don’t expect it to go on for weeks at a time. It’s going to boom and then bust because there just isn’t that much fermentation fuel to begin with.
Conclusion
Troubled fermentation can be frustrating. I would go down the check list next time you have fermentation troubles and see if this solves it. In the past we had a post about an emergency kit to have. One of the extra things that most homebrewers should always have on stock is just a few extra packets of generic dry yeast. This solves most problems.
Let me know if you have any quick solutions for stuck fermentation. Cheers!
Related Post
Emergency Kit For Homebrewers
Guide On Lagers
Off Flavors And The Fixes
Yeast Profiles
