This showed up in the log for my latest roast:
Board V1.5 / Serial 1421 / Firmware 591
Info 2969: 233
Error 47: 3900 (3900RPM) - IBTS fan low speed
The error message referred me to the online manual where there is not an entry for this error.
Doesn’t seem to have any effect on the machine. Is this serious or just an FYI?