While you wait for answers, we may have found some information which could help you.
Click here for Problem Suddenly StartedThe thread loops under the fa?
How to switch on light of sewing machine?
Sewing machine starts on its own?
Sewing machine issue?
How can I mend my Frister & Rossmann sewing machine?
Singer zigzag 457 Stylist not threading bobbin/making stitch?