Seems like it was the start of fermentation and that the spark got into adjusting fridge temp to target instead of beer-temp. My experience is that for ales with ABV around 5 i get approximately 2 degrees C higher temp in the beer than fridge temp.
According to whitelabs 21C is in the low end of optimal, so I guess it will turn out great
What was the issue? Software or missing connection?
I think as I have the thermowell connector from the store I screwed it in to my bucket but the software didn’t notice it, I rebooted the pi and it came back. It still smells great. Dry hoping it tonight