The fan spins, then it doesn’t. I have done two recalibrations. The chaff collector, basket and fan are scrupulously clean (to begin with), and yet, upon charge, the A-01 pops up. Restart fan. Over and over again. If the fan is at 5 or less, it drops to 0. If at 9, it may drop to 2 or 3, or maybe 0. I have carried a roast manually this way, and at cool, the fan works like a charm. Could the circuit board be turning it off, rather than interference from the chaff collector? The fan’s spacing on the axle has worked perfectly prior to this, so, I’m not thinking this is the issue. This of course started two weeks before the the warranty expired, and was only sporadic. Now, it’s constant. And on every recipe, mine, and stashed. I’m totally stumped.
I have no clue, but my fan acted strange when I mounted it off rotation. The locking screw needed to mate with the flat part of the rotator rod. It made my fan behave strange and gave me A-01 error. I took the squirrel cage off and then put it back on correctly and everything was better.
This may have nothing to do with what you have going on.
Thanks. The set screw has always been aligned, in fact there’s one small half-circle cutout in one blade of the fan (squirrel cage) at exactly the right point, so that the hex wrench can access the set screw in the proper position.
Forgive me if you have already tried this:
Please make sure that the chaff catcher basket is inserted into the rubber seal and that the lip is trapped in the groove.
Here is a link (hopefully) to a different thread with an illustration.
If the staiinless screen chaff catcher is not trapped, it can push over against the fan and stall out.
Also, there needs to be a small gap between the inside edge of the fan blade and the inside wall of the Bullet exhaust chute.
Thanks, billc. Over the past two-and-a-half years, I have been careful to A) have the black gasket of the chaff collector properly seated “all the way around”, to B) have the chaff collection basket seated properly in the gasket (checking with my fingernail all the way around, and C) that the fan is not too close the inside wall, or the chaff catcher. It is not an old gasket or basket, I replace them regularly. The fan itself is the only original piece, other than the chaff collector housing.
I’m wondering if this could be in the circuitry rather than the hardware, as the problems started with some seriously weird heating, i.e. extremely hot at both ends, but just warm/hot in the middle. It hasn’t done that since, yet, my “conspiracy theory” is it damaged the panel. I have ZERO technical skills, so, if you’re thinking,“This guy’s an idiot,” I beat you to it😁.
Sorry Zacateller,
I didn’t realize that you had your bullet for as long as you have.
Have you noticed any odd temperatures in the info screen?
If you spin the fan by hand, does it feel normal and smooth.
It does sound like it maybe something in the control software that may be causing a problem.
At this point in time, I think your best course of action is to contact Aillio Cusotmer Service and get their help.
Good luck. (you’re not an idiot)
I had constant A-01 alarms. Did everything thinkable, fan calibration, cleaning , checked nothing was blocked, etc. After some back and forth emails with Aillio, they said they did not know why I was having an issue. They suggested I use Stable V605 firmware (I was using beta). I have done numerous roasts and have not had any issues. Hope this helps.
Thank you both, wells1228 and rtuttleJr., I have been running 605 since it became the stable firmware, running 605 once when it was Beta, then going back down. I kinda play it safe, or so I thought. I must have done something wrong somewhere. Just can’t figure it out yet.
BC,
I was looking at your Error 42, IBTS CASING TEMPERATURE TOO HIGH post of last October, which was not too far from the time I had that very irregular heating of the roaster (extremely hot ends, warm to hot in the middle) and, while I can’t figure out why that occurred, is it possible that the IBTS and its circuitry is out of whack because of those very high temps? That is when all the trouble began.
Hey, zacateller,
Any uptade on your issue?
Having the same and just wondering…
I’ve been in a coma 
, sorry. I received some advice from Aillio, which solved it for a while, but, as in “Poltergeist”, They’re Baaaaack! They won’t find it, but it’s in the circuit board (somewhere). So, what I did: took the faceplate totally apart and then reattached the IBTF so that there was NO light coming through the canopy. Put everything back together. Then 6-8 weeks later…it tells me the fan is not operating/blocked, but I put my hand over the exhaust and IT’S BLOWING. So, when it happens immediately at start up, I “Cool Down” get the slightly warm beans cold again, and start over. No problem after that. Two weeks ago, that happened. But, four roasts in, A-01 popped up half way between Yellowing and FC, so, I did it all manually. I just watch the curve, and anticipate. I gave it to someone at Church, who is very critical, and, he noted that, “I don’t get the chocolate I usually get from your roasts, but, boy did I get fruit! And, while it wasn’t what I was expecting, I really liked it. But, go back to your standard roasts.” I want to get the new R2, as I have a buyer for this R1v2, and he knows the problems, but, I don’t have any idea what to charge him. Thanks for getting back to me. 4+months ago 
Oh, and now it won’t connect to RT4! Two weeks ago, no problem, tonight, “Disconnected" 
So fun to read XD
So, my story is:
A01 error occurring under various circumstances, with the following signs:
- In roasting mode: impeller suddenly stops with long beep, and F0 is displayed.
- In cooling mode: the impeller continues turning but the machine beeps.
- The errors are popping up quite randomly, but in the final “stage”, the A01 error appear every 10 seconds during roasting.
- Less errors in “uncalibrated” mode, but at least from the 3rd roast it goes hardcore
- Strange behavior on the display during calibration (for example, speeds were readable up to F6, and then the F number would stop increasing at F6. After that, the speed displayed as 0000).
- I’m unable to change the firmware, stuck on ver. 615 (don’t know if it is related)
Tested solutions:
- First new motor (new version) – solved the problem for about two years.
- Second new motor – solved the issue for a few roasts.
- New IBTS fan – made no difference.
- New back PCB – did nothing.
- New cable between the back PCB and bottom plate - nothing.
Many thanks for Aillio (Rasmus!) for amazing support and providing the parts.
Current stage - I have just sent the roaster to Denmark.
Fingers crossed!
Thanks!
Is yours a v1? Mine is a v2. (I’m still on Firmware 605!) If it’s a 2, I see what I have to look forward to with mine. I have told them, even though I have no idea what I’m talking about, that it’s in the circuit board, or mother board, or whatever they call it. And your history pushes me further in that direction.
I am so tired of hearing the Beeep, seeing A-01, seeing F0, but putting my hand over the impeller exhaust and feeling hot air blowing, and not just from the rotation of the drum. The log shows so many Errors, that I’m waiting for “Exhaust Blocked By Angry Crowd” or “Fan Tied Up By Unknown Force” to show up next.
I have to see if I can connect, since the last update to Roastime 4, all I get is “Disconnected”. I’m trying to follow their instructions, But, "If you are affected, you need to delete dependencies before restarting the app,” means nothing to me. 
FWIW,
I have put the fan on off rotation, which caused a fan error code.
To fix it, I lined up the securing screw with the flat side of the rotator rod. Error went away after that.
Probably isn’t what you all are experiencing, but just in case.
Thanks, Jimmy,
If I understand you correctly, though, I have been doing that since day one. The impeller has a small weight imbedded at one of the propellers exactly opposite the flat side of the impeller’s shaft, and that half-moon cut out directly above the flat side so we can access the securing screw with our Allen key. I really appreciate the advice, maybe someone looking at this will say, “Yeah! That makes sense. I’m gonna do that now."
You put it much more clearly. Thanks! And I hope you find an answer. I’ve been going 2years with issues on my Bullet, so I know the feeling!
Mine has serial number 1768, not sure now which version it is, probably ver2, bought early 2019.
I am tired of this error the same way you are.
Pretty much ready to spend the money for the new main board…
So, It looks like my jurney is about to end.
Rasmus from Aillio examined my Bullet and concluded, that it is the main board what is broken. End of (not so cheap) story.
Will receive the machine back in a week and hopefully will live happily ever after XD