Two weeks ago I used my new upright freezer for the first time on a 14 gallon batch of lager. I pitched a decanted 3 gallon starter of WL830 (that was grown on a stir plate) at 70F and went to bed. The next morning the wort was 46F. I then went out of town for the next 4 days. When I returned the temp was 50F. I again left town and when I returned two days ago the temp was still 50F but the gravity had only come down from 1.064 to 1.030. I have let the temp rise to 58F. While I was expecting a greater reduction in gravity, would it be advisable to now roust the precipitated yeast either by stirring or by bubbling CO2 up through my bottom dump valve?
I don’t think it would hurt anything. since you have a conical, and I assume co2, I would try bubbling the co2 through the dump valve and see what happens. you might want to get a big active starter going to, just in case.
Or perhaps perform a forced/fast ferment test and make sure there is not a problem with the fermentability of the wort.
I would rouse the yeast and raise into the mid 60’s for a D-rest, let it finish , rack off the yeast and then proceed to lager it
Seems to have worked as well as I could expect. Gravity is now 1.018, so time to lager.