Newbie with a LME kit not starting to ferment. Any ideas??

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LiamPope

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Jan 20, 2025
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Hi. Just signed up (said hello in the intro thread) and have an issue with a simple LME ginger beer kit (mildly expired) not starting to ferment. I thought these were idiot-proof!

A little background that might be relevant for troubleshooting...

So, couple of years ago (can't remember exactly when) there was a closing down sale at a local homebrew shop. I went along and participated in what had all the madness and chaos of a looting (except people kindly stopped to pay when leaving with their arms full) and came away with a Grainfather G40, some kegs and CO2 paraphernalia, some boxed all-grain kits and some LME kits. Then was too busy with babies and stuff for a while, but couple weeks ago got round to some brewing.

First did an all-grain American pale ale kit to try out the Grainfather. The yeast sachet expiry date on that was 11.24, so I thought it'd be probably fine. That indeed seems to have gone great - all targets pretty spot on per the recipe and now ready for kegging (which will be another new journey for me) - very happy with that assuming I don't still **** it up.

Now the problem batch...

Week later (so a week ago now) I mixed up a simple ginger beer LME kit from a pouch. Pouch had a BB date 07.24, so slightly expired, but everything I've read said that shouldn't be a problem. Chucked in the extra DME required, shook up and sprinkled on the yeast from the sachet under the pouch. It asked me to stir it so I did (although I usually don't).

5 days later - nada. Can't see a single bubble coming out, and the water levels in the two little chambers of the airlock is dead level (usually I always see the level higher in the 'outer' chamber as the fermentation creates some internal pressure in the plastic vessel that pushes the water round a little - sure you know what I mean). So I figured maybe that yeast was dead, so I sprinkled in two sachets of yeast from one of the other grain kits with an expiry date 03.25, so that has to get it going, right? Few days later (now 8 days since mixing it up) and still nothing???

That has me flummoxed! Never had an issue like this before and wondering what I can do. Get a brand new yeast and chuck that in - third time lucky? (but how can the not-even-expired second yeast be bad?). Can the extract have gone unfermentable? Not that I know of. If I put more in should I try rehydrating or making a starter (never done that before - always just sprinkle the dry yeast and had no issues). Or can I try something to get what is in there going - nutrient or just give it a good shake?

The room is steady at around 21 C. Any thoughts much appreciated!
 
OH MY GOD!! FALSE ALARM! IDIOT ALERT!! :) :)

I think I've figured it out!

So I thought I'd try a good old shake. When I did I got stuff bubbling out the airlock, but not normal bubbling - more of a hissing, like it's under high pressure! So I took off the little red cap on the top of the airlock and it was like popping a pressure relief valve!

Pssshhhhhhhh!! and violent bubbling and foaming out the airlock for a while as if the beer was boiling. :)

So these particular airlocks I have I've always noticed the red cap seems pretty tight. It has me pondering for 20 seconds or so as surely it shouldn't be tight as it must not seal, then I proceed and have no issues. This particular time, yes I did notice it seemed even tighter, so I pondered a little longer and proceeded.

The airlock was literally sealed! I saw no bubbles and the water levels were even as nothing had any place to go! I think it has been fermenting all this time just building pressure!

Doh, doh, and doh!

Only way to be sure now is to take a gravity reading. I didn't do it before as I was so convinced nothing at all could be happening! I'll wait a day or two for it to settle down and take a sample and see.

I've left the cap off and just perched a bottle cap on top to stop spiders climbing in, or whatever that cap is for. Airlock is behaving normally - bubbling but pretty slow. It is day 8 so I guess it's almost done (10 days per the pouch instructions) so that fits.

I've never read this particular noob error before, so hope this maybe helps someone! Time to get better made airlocks!

Cheers
 

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