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FAQs & Troubleshooting

FAQs & Troubleshooting

Why does the upper thread keep breaking?

There could be several reasons why the upper thread keeps breaking.


  • The upper thread could be installed incorrectly.
    Rethread the machine according to the instructions.

    For details, refer to "Upper threading".

  • The upper thread tension could be set too tight.
    Set the tension to the best thread tension setting or less.
  • Make sure the spool of thread is installed correctly using the correct size spool cap for the size of spool.

    For details, refer to "Place a spool of thread on a spool pin".

  • Make sure the needle is correctly inserted with the flat side facing the back and pushed up into the machine as far as possible.
  • The needle could have been damaged or bent.
    If so, replace with a new one.
  • The lower thread tension is incorrect.
    The thread does not roll out of the bobbin case smoothly.
    Adjust the lower thread tension.
  • The bobbin thread is not wound correctly.
    Check that the bobbin is wound so that it about 80% full and that the thread is evenly wound.
    If the bobbin is not correctly wound, rewind the bobbin.
  • The thread density of the embroidery data is too fine.
    Three or more overlapping stitches are being sewn.
    Using a data design system, correct the thread density and overstitching settings in the embroidery data.
  • The embroidery data contains stitches with a pitch of zero.
    Delete all stitches with a zero pitch.
  • The embroidery data contains many stitches with an extremely small pitch.
    Delete all stitches with a small pitch.
  • The fabric is not taut.
    Firmly set the fabric in the embroidery frame so that it is taut.
  • The thread is loose in the hook area or the hook does not rotate smoothly.
    Remove the loose thread.
  • The thread quality is poor.
    The thread quality is too weak due to age of thread.
    Replace thread.

    Remove any knots or tangles.

  • A bobbin designed specifically for this machine is not used.
    Be sure to use the correct bobbin.
  • Needle and thread are incorrect.
    Be sure to use the correct thread and embroidery needle.



* In the cases shown below, consult nearest authorized Dealer or Service Center.

  • The area around the hole in the needle plate is damaged.
  • The needle hits/touches the needle plate.
  • The presser foot is set too high and not correctly positioned. The needle hits/touches the presser foot.
  • The area around the embroidery foot hole is damaged.
  • Sliding surface on hook race is not smooth.
    There are scratches or burrs on it.
  • The play between the hook and the race is too much.
  • The space between the hook stopper and the hook cannot be adjusted.
  • The automatic needle-threading mechanism is broken.


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