Article version: 1.0 (Applicable to L818F-M1 with control boxes dated 2018–present)

: Signal Noise/Position Detector . External electrical noise is interfering with the input, or the position detector is unplugged.

: The machine cannot detect the "Up" or "Down" needle position. Check the detector's connection and signal. E14 (Encoder Signal Error)

The Siruba L818F-M1 error system is robust but requires systematic diagnosis. Most errors (E-004, E-005, E-013) are recoverable with cleaning, recalibration, or parameter adjustment. Hardware-related errors (E-001, E-016, E-015) usually indicate component replacement is needed. Always keep a spare synchronizer and pedal sensor in your service kit for this model.

: Overvoltage or Inertia . This may occur if the power voltage is too high or the machine’s deceleration time is too short for its inertia.

Check : Ensure the machine is not mechanically jammed and inspect motor cables.

| Error Code | Meaning | Common Causes | Solution | | :--- | :--- | :--- | :--- | | | Needle up/down signal error | Magnet fell off handwheel; Sensor gap too wide; Broken synchronizer wires. | Open motor cover. Clean the magnetic ring on the handwheel. Adjust sensor gap to 2-3mm. Replace synchronizer PCB. | | E-12 | Needle position not found | Machine turned on with needle at wrong angle; Dead battery on control board. | Manually rotate handwheel to top dead center before powering on. Replace CR2032 battery on main PCB. | | E-20 | Thread trimmer solenoid error (Option) | Trimmer solenoid stuck; Broken wire to solenoid; Triac shorted on board. | Check resistance of trimmer coil (should be ~15-30 ohms). If open, replace solenoid. If shorted, check IC on driver board. |

When you see an code:

This machine is a high-speed, direct-drive, 1-needle, 2-thread chainstitch machine (commonly used for hemming, lap seaming, and attaching elastic). The M1 control unit is a microprocessor-based system that monitors motor, pedal, and synchronization status.

: Dust or lint on the encoder sensor, a loose connection on the encoder board, or a failure in the main board components (IPM).

If your machine has stopped mid-production and is flashing a cryptic code, you don’t need to panic. Below is the , including the cause, symptom, and step-by-step solution.