Nice… enjoy!
Oddly enough… I stopped getting the error lol. I wonder if it was a fluke or fan decided it was going to start working.
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I am facing the same problem after the first day of use. It printed fine for several hours prior to this and the problem only came up AFTER I updated the firmware.
My bet is on the firmware…. 
I’m having the same issue… Seems to only happen after printing something in ABS, PETG, PA and the chamber is hot. It was happening before and after the firmware update, so I don’t think it’s the firmware in my case.
I unplugged the cooling fan and plugged it back in and it appears to be working fine now. For anyone else with this issue, that’s probably a good starting point.
Yep, the same issue here, after 32h it started to be very noisy, so i would expect that ot will die soon. Already sent me a replacement
Mine failed on the second day with less than 20 hours of printing. Same error for the right hotend fan. Not running at all. Reseat the cable with no results. I have send an email to the local distributor and tomorrow i will visit them to find a solution.
So with only 29 hours on my new X2D I started getting this error after swapping to 0.2mm nozzles for an important customer order I have to get out.
Seems, based on this /redit thread https://www.reddit.com/r/BambuLab_Community/comments/1svqjh6/fixed_x2d_hotend_cooling_fan_error_after/
That the problem is because the magnet in the hotend interfers with the DC fan motor and causes it to send weird readings….. the right hotend fan only comes on when its decended into the active position…. but it does work and spin up like it should… but the firmware is seeing bad data because of the hotend magnet.
This is an engineering failure on Bambu’s part they they NEED to fix. Perhaps different DC fan motors that aren’t so sensitive to the magnetic field created by the hotend…. perhaps better sheilding of the motor… perhaps a firmware update to compensate for the reading anomoly? something needs to be done.
Isn’t that just referring to 3rd party hotends, and not original BL?
old thread but forgot to follow up, I started getting the error again and replacing fan resolved. Not sure if it was fan, plug or simply just act of reinstalling or what but didn’t want to chance and replaced fan as it’s a B to work on the toolhead.
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Well, apparantly it happens with genuine Bambu hotends too… a magnet is a magnet, and its proximity tot he DC motor is going to have an impact regardless of who makes the fan.