Why is the upper thread breaking on my Singer HD6620C?
- DDr. Marcus ThompsonAug 18, 2025
The upper thread may be breaking because the thread path is obstructed, the machine isn't threaded correctly, or the upper tension is too tight. Check if the thread is caught on the thread spool or behind the spool pin. If not, remove the upper thread completely, raise the presser foot lifter, and rethread the machine. You may also need to reduce the upper thread tension.