That is what I thought also but when I inquired about a ERC 32 and power issue I was having they replied today:
Thank you for your reply. Based on the roasting logs of your Bullet on our system, the IBTS reading is getting really close to the Bean Probe, which suggests there could be some residues on the sensor. Sometimes when the exhausting efficiency gets affected (chaff filter getting dirty, for example), it is possible to have extra dust compiling on the sensor. The IBTS system is using the fan to create an air pressure barrier to keep the chaff/dust away from the sensor, instead of self-cleaning, so it still needs to be cleaned up once in a while when the reading has become a bit off. A dirty IBTS sensor will give a lower-than-actual temperature reading, resulting in overheating, which triggers ErC 32. Please follow the cleaning guide and send us some photos to check as well. Hope this clears it up.