Not sure from the posts if you’ve found the Bullet Manual which is available on the Aillio site under Support > Downloads (if you have just ignore this post).
The manual has the 5 Warning code explanations (A-01 thru A08) as well as the 17 Error Codes. There are also instructions for setting PRS defaults so you don’t have to set the PreHeat each time you roast.
Also in the Downloads you should find the instructions for running Fan Calibration, though by now I would think it should arrive already calibrated. If you can choose Fan Speeds FA & Fb, it’s already calibrated.
A-08 can possibly indicaate that there is contact between the chaff collector filter and the exhaust fan. Check carefully that the filter (the screen cup) is properly seated in the black silicone gasket that holds it in place. There are 2 grooves:
- the outer groove is easy to see and (without the filter installed) is easy to seat
- the inner groove is harder to see and equally hard to seat the outer rim of the filter screen into it.
If the filter screen (the screen cup with the bale) isn’t properly seated in the black rubber gasket, beans with a lot of chaff will cause enough pressure drop that the filter will literally be pushed out of the tight fitting rubber gasket (the rubber softens from heat under this condition) and will allow the filter to contact the fan and slow it down or even stop it.