New answers tagged first-time
Several problems can be occurred, one that is very common in the first brewing is temperature control, mainly if using stainless steel kettles. You can denatured enzymes heating the wort above the enzyme range activity. Did you made iodine test to measure starch conversion into sugars ?
The yeast could be old. Sometimes those off the shelf kits can be really old, but all the ones I am familiar with come with dry yeast and those packs should be good for over a year, unless the pack got super hot, or a bad batch of yeast, etc. Other potential issues with a higher finish gravity could be: the yeast isn't finished, so allow more time before ...
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