Well, after only 2 years of distilling I had my first BIG fermentation fail on sugar wash.
I was set to run the first of four 30L barrels (~23L of wash) today. They'd been fermenting for 6+ weeks. I gravity tested and only saw a very minor variance. After I did the smell and finger-dip test I knew something was wrong - full of sugar. I actually have RAPT pills floating in each barrel - see here if you don't know what they are: viewtopic.php?f=29&t=14658 - but I thought I'd stuffed up configuring them and assumed they were misreading. Turns out they are reasonably accurate and it is indeed fermentation that has stalled.
I tried to salvage by adding re-activated distillers yeast into two of the barrels but after 4+ hours there's no activity. I'm thinking I'll just ditch the 4x fermenters down the drain and start again... unless the brains trust has another suggestion?