I have a Bullet R2, purchased earlier this year. I started seeing my roasts hit FC close to 374F/190C about 3 weeks ago. It coincided with my first 1kg batch of a specific coffee, so I assumed it was just that specific bean as a 1kg batch and didn’t think anything of it. It continued and was odd, but my results were still good so I didn’t worry about it.
I noticed that my breaker started tripping more, because I was on a 15A circuit instead of a dedicated 20A, so I upgraded the circuit over this past weekend. At the same time, I also found where the maintenance instructions say to clean the IBTS if FC temps start dropping below 383F, so I did that last night (and it was surprisingly filthy, probably from using the roaster to dry barrel-aged coffee this week; lots of ash). My assumption this morning is that the roaster will now behave like normal, but this morning I did a 1lb batch of a tried-and-true coffee that always hits FC past 390F, but it still hit at 374F and I don’t get it.
From reading on here, it looks like the control board should manage the power to the roaster consistently enough that upgrading the circuit wouldn’t make a difference in the roast; it should just keep the breaker from tripping like it used to. I was expecting the IBTS cleaning to be my solution, but I just don’t know what could be wrong. I looked at my roast log and this started on June 01, but I roasted a kilo the day prior with an FC at 393F. I don’t know what happened that next day that could have possibly caused this. Does anyone have any idea what’s up?