Please check if the Fan #1 of the nozzle in the image below spins several times before Error Code 321 message pops up.
If it doesn’t spin, please follow the instruction under 5-10 section on user guide to disassemble the nozzle (The user manual can be found at http://3dprinter.sindoh.com/ Downloads).
Try to spin the fan#1 with your finger and see if it spins. Please remove anything stuck in the fan such as a filament residue.
After cleaning the fan, please reassemble the nozzle and try rebooting again to see if the problem still persists to occur.
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