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Old 07-16-2012, 06:29 PM   #1
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Default Bready Yeast Smell

I have been having a bit of an issue with some of my beers. A lot of my beers end up having a fairly strong bready yeast smell to them. The smell never really fades even after the beer has cleared. I often end up with beer that pours crystal clear from my keg but still smells like yeast. It doesn't taste like yeast but the smell is strong enough to make the final product a little less enjoyable. The last batch that this happened to was an IPA and it was dry hopped with 3oz of centennial. Does anybody know what is happening?

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Old 07-16-2012, 06:48 PM   #2
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How long do you leave it on the yeast in primary/secondary on average?
How closely do you control fermentation temps? What temp do you keep them at?

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Old 07-16-2012, 07:08 PM   #3
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How long do you leave it on the yeast in primary/secondary on average?
How closely do you control fermentation temps? What temp do you keep them at?
I rarely secondary anymore, most of the time I leave my beer in the primary for about 2 to 5 weeks before kegging (depending on the style and my schedule)

I don't have any fermentation temp control but the ambient temp in my crawlspace where I ferment my beers is a pretty consistently between 66-68 degrees.
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Old 07-16-2012, 11:23 PM   #4
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Generally, "yeasty" would be attributed to too much time on the yeast. 5 weeks "might" be getting a little long, but 2-4 should be fine. 68 degrees for ambient temp is getting on the high end. Beer can be at 5-10 degrees higher than ambient depending on how vigorous the fermentation is. That could maybe be driving some yeast off flavors. Also, unhealthy or underpitched yeast could be a possible culprit. If the yeast aren't healthy enough to "finish" the job, that could maybe be a problem. starter? yeast nutrient? O2?

Clean tap lines? Sometimes musty/moldy is described as "bready or yeasty"???

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Old 09-28-2012, 11:34 PM   #5
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I'm having a similar Problem, at the moment, there is a clear yeasty smell in the bottle.
the heat pad is directly under the barrel, and is controlled by a thermometer with a 1-1.5 (set 19-20C) degree variance. This is happening on APA's mainly using US-05. I dont think theres an infection etc. I first thought it was just a batch of yeast. its sits for 2 weeks normally and then gets bottled, everything is sterilised.

I'm wondering if this has something to do with the heat pad being directly underneath it? heating the plastic, which heats the brew.
Its food grade plastic before anyone starts asking questions. the temp probe is attached and insulated to the side of the barrel, which eliminates the ambient differences in temperature.
the beer recently, was 1.043 OG. with 40IBU's
2lbs Light DME
3.3lbs Amber DME
6.5oz Biscuit Malt steeped 20 min
0.7oz nugget @ 60
0.5 Cascade @ 15
0.5 Cascade @5
0.5 Cascade @ flameout
1oz cascade dryhop.
and i used 1 package of US-05, rehydrated in 100ml of water.

Any ideas??

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Old 09-28-2012, 11:46 PM   #6
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Originally Posted by crusader1612 View Post
I'm having a similar Problem, at the moment, there is a clear yeasty smell in the bottle.
the heat pad is directly under the barrel, and is controlled by a thermometer with a 1-1.5 (set 19-20C) degree variance. This is happening on APA's mainly using US-05. I dont think theres an infection etc. I first thought it was just a batch of yeast. its sits for 2 weeks normally and then gets bottled, everything is sterilised.

I'm wondering if this has something to do with the heat pad being directly underneath it? heating the plastic, which heats the brew.
Its food grade plastic before anyone starts asking questions. the temp probe is attached and insulated to the side of the barrel, which eliminates the ambient differences in temperature.
the beer recently, was 1.043 OG. with 40IBU's
2lbs Light DME
3.3lbs Amber DME
6.5oz Biscuit Malt steeped 20 min
0.7oz nugget @ 60
0.5 Cascade @ 15
0.5 Cascade @5
0.5 Cascade @ flameout
1oz cascade dryhop.
and i used 1 package of US-05, rehydrated in 100ml of water.

Any ideas??
You're right at ideal temperatures, and the recipe is alright. So I have no idea. Unless it is that heating pad so close to the yeast. I mean, if the temperature indicator is on the side of the barrel, but the heating pad is on the bottom, maybe it's a lot warmer at the bottom than the top. Can you somehow change that so that the temperature probe reads where the heat is provided?
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Old 09-29-2012, 01:25 AM   #7
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That's what I think too its the only thing I can think of

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Old 09-30-2012, 08:15 PM   #8
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You're right at ideal temperatures, and the recipe is alright. So I have no idea. Unless it is that heating pad so close to the yeast. I mean, if the temperature indicator is on the side of the barrel, but the heating pad is on the bottom, maybe it's a lot warmer at the bottom than the top. Can you somehow change that so that the temperature probe reads where the heat is provided?
I spoke to a couple of members of my HB Club, they said, if the heat pad is directly heating the barrel, it could overheat the trub at the bottom and create this yeasty smell. Is that true Yooper, cos it kind of makes sense?
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Old 09-30-2012, 10:17 PM   #9
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I spoke to a couple of members of my HB Club, they said, if the heat pad is directly heating the barrel, it could overheat the trub at the bottom and create this yeasty smell. Is that true Yooper, cos it kind of makes sense?
Yes, that's my guess as well. "cooking" the yeast on the bottom, so to speak, would cause some yeast flavors.
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Old 10-02-2012, 10:16 PM   #10
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Yes, that's my guess as well. "cooking" the yeast on the bottom, so to speak, would cause some yeast flavors.
Well I thought I would test a scenario out by putting the pad leaning against the wall of my small cabinet, and because the insulation isn't as good as it could be, there is only a very minor heat increase, in 24 hours. so I'm testing another scenario out, I have a wire fan guard, which I'm going to sit on the pad, which the brew will sit on top of, its flat, and hopefully will give me enough heat increase when required, and also offer a "No Yeast cooking" solution.

Kiwi Ingenuity at its Finest.
Putting a brew down tomorrow night, so will see what this scenario does for me.
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