Think I have a stuck fermentation...

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jarenault

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So, I've made an extract + speciality grains based stout (6 lbs of light DME, 0.5 lb of dark malt, 0.5 lb of chocolate malt, 9.6 oz of crystal malt, 0.5 lb of roasted barley - also threw in 500g of maltodextrin powder at the end of the boil). Everything seemed to go fine. OG measured at around 1.052. Pitched the yeast at 4pm on Saturday. At about 8pm, as I was departing for the pub, it was bubbling away nicely. I thought this was rather quick to get going, but wasn't too worried. When I got home at around 1am, the brew was frothing through the airlock and there was wort all over the top of the fermenter and the floor. I quickly installed a blow-off tube, running into a litre jug with about 100mls of sanitising solution in it. This seemed to do the trick and the sanitising solution in the jug was bubbling away like crazy.

This all seemed a bit much for only nine hours post-pitch. However, when I got up the next morning: nothing. No frothing. No bubbling. Krausen had diminished to almost nothing. I removed the blow of tube, stuck an airlock back in and gave the fermenter a shake. A few hours later I checked how things were going. Watched for three minutes and nothing bubbled through the airlock at all. I checked the seal by squeezing the bucket, and got some nice bubbles, so everything was airtight.

"No worries," I thought "I'll give it another shake and check it again in the evening."

So I did. Still nothing. No bubbling, no krausen.

This time I decided to take a hydrometer reading: 1.030. Some fermentation had definitely occurred, but it was way off what I thought the FG would be. I left it overnight and have just checked again now (Monday evening, 52 hours after pitching and 24 hours after the last hydrometer reading) and it's still sitting at 1.030.

So, that's my story of worry and woe, it only remains for me to ask a small question: what now?
 
sounds to me like the yeast has shot its bolt :( , you may have a few un fermentables in there but 1030 is too high , if after you've tried to stir it etc as link says (in piddles post) i would try adding more yeast , to quick can sometimes lead to the yeast slow or stop working , and too much co2 can make the yeast sleepy . But i would guess you just need more fresh yeast
 
piddledribble said:
search for stuck fermentations theres several threads

heres one

Yeah, I've read a lot about stuck fermentations. I already plan on taking another hydrometer reading at the same time tomorrow and then repitching yeast if I get the same reading again.
I guess what I'm really asking is: does this specific series of events sound within the limits of normality? I mean, crazy fermentation within 9 hours and then nothing after less than 18?
 
pittsy said:
sounds to me like the yeast has shot its bolt :( , you may have a few un fermentables in there but 1030 is too high , if after you've tried to stir it etc as link says (in piddles post) i would try adding more yeast , to quick can sometimes lead to the yeast slow or stop working , and too much co2 can make the yeast sleepy . But i would guess you just need more fresh yeast
Cheers! I was worried about something like this.
 
yes it happens but there can be many different reasons for stuck brews . How did you extract the sugars from the grains ? what temp , how long etc and so on .
 
pittsy said:
yes it happens but there can be many different reasons for stuck brews . How did you extract the sugars from the grains ? what temp , how long etc and so on .
Thirty five minutes at 70C in 4 litres. I managed to keep the temperature fairly constant and paid close attention to it throughout. I steeped them in muslin bags after bashing them about a bit with a rolling pin.
This was actually my first attempt at grain-steeping...
 
sounds ok , 64c thinner beer 72c fuller beer but will ferment out less , most opt for around 66c . May just be the yeast has run to fast for some reason
 
jarenault said:
I guess what I'm really asking is: does this specific series of events sound within the limits of normality? I mean, crazy fermentation within 9 hours and then nothing after less than 18?
What was your fermentation temp? Too warm and it could have gone off like a rocket.
 
Probably not likely, but could it be possible that somehow, the sanitation solution in blow off jar was somehow sucked up and back in to the beer? I wouldn't think so, but that would possibly kill the yeast?!
 
Thanks for all the responses!

I held my nerve and waited a few days. Just checked just now and..................1.024! I was so sure that it was still going to be stuck at 1.030 that I stuck a re-hydration jar in some sanitizer before I went to check the gravity, so I could get the yeast ready to re-pitch.

I've often heard it said that when you think something is wrong with your brew you should wait before you do anything drastic. Then wait some more. Then wait just a little bit more. And whaddya know?
 
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