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For advanced technical parameters, you can refer to the official Siruba DL720 Series Electronic Manual which shares many control system commonalities with the L818F series. If the control box itself is faulty, it may require replacement by a certified technician.

The needle position detector is not sending a signal. Ensure the detector is properly aligned and plugged in. Solenoid Short-Circuit siruba+l818fm1+error+list+2021

The fuse for the 12V power supply inside the control box is likely blown. Safety Switch Active For advanced technical parameters, you can refer to

If you encounter an error not listed above or if the code persists after the initial check, follow these general maintenance steps: For advanced technical parameters

: A bent or broken needle can cause mechanical resistance. Replace the needle if you suspect it is causing jams.