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Old 08-20-2010, 11:09 PM   #1
Salanis
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Default A Stuck Fermentation

Yeah, I'm sure these came up a lot. Anyway, I appear to have a stuck fermentation on my American Pale Ale. Partial Mash APA, fermented for 3 weeks. O.G. 1.052. I'm figuring it should finish about .012 or generally in the .010-.016 range. Instead, it appears to have stopped at 1.020.

It's fermented on WLP001 ale yeast, and it was well aerated. Fermentation took off fine. I wonder if maybe my mash temps are a bit too low or not long enough. I'm mashing in an over at about 148-152 for 60minutes. Do I need to mash for longer? Fermentation temps have been kept under control by immersing the carboy in a big bucket of cool water.

Whatever the case may be, it's okay, but just a bit too sweet. It's not a good start for what I'm doing right now.

This is the first of a series of single-hop beers I'm attempting. I'm just changing hops between them, and really want to get my other flavors fairly uniform across batches. I know it's homebrew, and I can't expect to beers to turn out exactly the same, but having something sweeter will be a significant outlier.

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Old 08-20-2010, 11:19 PM   #2
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Try repitching a little dry ale yeast on it. I had a stuck ferm on a Brown Ale and after 4 weeks the SG was .021. I repitched a small pack of dry ale yeast on it and 4 days later it was perfect!

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Old 08-20-2010, 11:31 PM   #3
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Pitch the yeast strait in? Or do a starter?

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Old 08-20-2010, 11:43 PM   #4
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I just pitched it straight in. Worked like a charm.

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Old 08-20-2010, 11:47 PM   #5
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The thing about a stuck ferm that you have to worry about is that once it is in the bottle, something could happen (ie temp change) that could cause the fermentation to restart and then you have bottle bombs!! I would definitely just repitch the dry yeast straight in.

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Old 08-21-2010, 12:18 AM   #6
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Okay, the one dry yeast packet I have on hand has been sitting in a cupboard for a couple months, not refrigerated as directed. Do you figure it's still okay?

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Old 08-21-2010, 01:02 AM   #7
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Swirl it around gently, and warm it up a bit before you waste more yeast.

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Old 08-21-2010, 01:41 AM   #8
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Quote:
Originally Posted by KayaBrew View Post
Swirl it around gently, and warm it up a bit before you waste more yeast.
Wait, which? The fermenter or the yeast packet?

I have been swirling the carboy, but I haven't heated it any.
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Old 08-21-2010, 07:17 PM   #9
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The fermenter. Try warming it up to 70F

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Old 08-22-2010, 04:40 AM   #10
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Roger that. I'll just take it out of the cool water bath and see what it does.

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