Check for the following matters.

• Probable cause

  The threading on the machine is improper.

   

  Remedy

  Make sure that the threads are passed into the machine properly.
  Rethread the threads to the machine in an appropriate procedure.

• Probable cause

  Thread is tangled.

   

  Remedy

  Check the spool pin, thread holders, etc., and remove the tangled thread.

• Probable cause

  The needle is bent, or the tip of needle is blunt or broken.

   

  Remedy

  Replace with a new needle.

• Probable cause

  Thread tension is too tight.

   

  Remedy

  Adjust the thread tension properly.

• Probable cause

  Needle is installed incorrectly.

   

  Remedy

  Reinstall needles correctly.
  Make sure that the needle is installed until it touches the needle stopper.

• Probable cause

  Wrong needle is used.

   

  Remedy

  Use a standard home sewing machine needle. The recommended needle is 130/705H (90 / #14).