18aa367c_ooting_Sewing_Machine_Problems__Symptom
[Root Cause] The stitch length has been set to zero. The presser foot pressure is too low. Feed dogs are lowered. Threads are knotted under fabric. [Corrective Action] Reselect the proper stitch pattern and length. Set presser foor pressure adjustment lever to "normal". Raise feed dogs. Place both threads back under presser foot before beginning to stitch. [Symptom] 
The machine does not feed material.
Troubleshooting Sewing Machine Problems
Symptom