: The machine cannot find the UP/DOWN needle position because the detector signal is broken.
However, the is an electronic lockstitch needle-feed industrial sewing machine. Based on the official Siruba L818F series service manual (which covers multiple years, including the firmware common in 2021), here are the standard error codes that apply to this model. siruba+l818fm1+error+list+2021
Since the L818FM1 is a heavy-duty machine, users often mistake mechanical issues for electronic errors. : The machine cannot find the UP/DOWN needle
Features a built-in lubrication system (self-oiler) and noise-suppression technology for quieter operation. including the firmware common in 2021)
For more detailed technical drawings, you can view the Siruba L818F-M1 Instruction Manual or the Official Parts List for replacement components.