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My beer is stuck at 1.052 and it started at 1.092. The type of yeast is wyeast #3522, so I expect it to get quite a bit lower. It's been 3 weeks since we brewed it and it's now rather clear. I suspect that my apartment got too cold. Can anyone help me revive my yeast?

Recipe

  • 8lbs pilsner LME
  • 2lbs light DME
  • 1lb Carapils
  • 2lbs candi sugar
  • 1oz Northern Brewer
  • 1oz Saaz
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What was your malt bill? What temperatures has it seen? –  baka Feb 9 '11 at 1:26
    
Did you add the candi sugar to the boil? –  baka Feb 9 '11 at 1:38
    
yes...last 10 min –  kelloti Feb 9 '11 at 1:40
3  
A little tool to see how far your beer could go with that yeast: pjhoberman.com/tools/attenuation.html –  hookedonwinter Feb 9 '11 at 2:35
    
listen around 33 minutes into this show, and next time, try what Jamil says to do: Belgian Tripel –  baka Feb 9 '11 at 2:35

2 Answers 2

You may be able to raise the temperature up to the mid 60's to low 70's, and give it a good, hard swirl in the fermenter (assuming you're in a bucket or carboy), to get it roused. You may need to rouse it a few times over a couple of days to get it back up and going.

If that doesn't work, you may be able to make a small starter with some US-05 or T-58 dry yeast, and repitch with that (be sure to rehydrate with 90-100F water for 5-15 minutes first). That's why I always keep a few packs of dry yeast around.

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I'd vote the starter route. Be sure to add yeast nutrient and energizer to the starter as well. –  Hopwise Feb 9 '11 at 4:07
    
Don't like the idea of making rescue starter with dried yeast. Dried yeast won't get active enough for this type of situation (high gravity start, and high gravity stall). And you can't make a "small" starter in this situation either. It has to be normal sized or better to get a real good slug of active yeast fired up to do the job. –  brewchez Feb 9 '11 at 12:51

Before you do any repitching, you must get the temp up first. Otherwise the new yeast will just settle out with temperature shock too. That strain is a high flocculator, so if the temp is to low it certainly drops out early. Get the temp up to 72F and try the following ideas.

Then I'd rouse the yeast you have a bit and see if it will come revive and be active. You can pick up the fermentor and gently swirl it until the you get enough liquid movement to get the cake moving, but that can be very tough. A better option is to go in with a sanitized racking cane and gently agitate the cake a bit to break it up. The best option would be to attach a CO2 source to your racking cane and use some CO2 flow to bubble the cake up.

Keep in mind that bubbles in the airlock after rouse an the temperature increase won't indicate activity. It will just be residual dissolved CO2 coming out of solution. You'll have to monitor the gravity.

If you didn't aerate the wort well, or pitch yeast from a LARGE and very active starter there is no way you could expect that yeast to finish a 1092 wort. So you will really need to pitch more yeast.

I'd suggest getting another good starter going of the same yeast actually. The Ardennes strain is a good fermentor. Get that temp up and pitch another good starter of the same yeast. You can try an neutral ale yeast, but the Ardennes is better suited to this high gravity wort than a US05 or WLP001 or WY1056.

Another option would be to pitch two rehydrated packets of dried yeast if that's easier for you. But you should be able to rescue this beer with more of the same yeast.

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thanks for your thoughts. I originally pitched 3 packages of yeast & aerated the wort (although it was an activator, so there wasn't an awesome starter involved). I believe this should have been enough yeast, but I suppose I could pitch another. We also just pitched in some nutrient 2 days ago. –  kelloti Feb 9 '11 at 15:38

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