¶ Phenomenon Description
Screen displays "BM0111, Hotend connection abnormal"
¶ Cause Analysis
Communication abnormality between mainboard and nozzle adapter board.
¶ Troubleshooting
First check if the nozzle board shows a blue light when error code BM111 occurs. If there's no blue light, check if the power cable from the adapter board (the board next to the upper computer board) to the nozzle board has normal power supply, which should be 24V.
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With the machine powered off, disconnect all cables from the nozzle board except the nozzle cable, then power on to see if the error still occurs (to rule out short circuits from other modules affecting nozzle board communication).
以上排查都尝试过，仍未解决问题的话。请继续检查喷头板，喷头排线，喷头转接板（位于上位机板旁边那块主板）等，是否有虚焊或者烧毁的痕迹，排线是否存在破损，接触不良的问题。如果检查没问题，建议您联系客服，您需要优先更换喷头板和喷头排线。
If above steps fail to resolve the issue, inspect the nozzle board, nozzle cable, and adapter board (the board next to the upper computer board) for cold solder joints or burn marks, and check if the cables have any damage or poor contact issues. If you check all but still fail to find anything wrong, please contact cs@creality.com for more help. Probably you may need to replace the nozzle board and nozzle cable first.
¶ Friendly reminder
If you still haven't resolved the issue after following the steps in this document, or if you encounter any difficulties during the process, you can click the right corner of the wiki page online support to contact our after-sales team for more help.