Attachment
70
2019-02 EN 5020070.00A.04
8.2 Troubleshooting
Fault
Cause
Repair
Uneven stitch formation
Upper thread too tight or too
loose.
> Adjust upper thread tension.
Needle blunt or bent.
> Replace the needle, make sure that a new BERNINA
quality needle is used.
Poor quality needle.
> Use a new BERNINA quality needle.
Poor quality thread.
> Use quality thread.
Incorrect needle/thread
combination.
> Match the needle with the thread size.
Incorrectly threaded.
> Rethread.
Skipped stitches
Incorrect needle.
> Use the needle system 130/705H.
Needle blunt or bent.
> Replace the needle.
Poor quality needle.
> Use a new BERNINA quality needle.
The needle is incorrectly inserted.
> Insert the needle with the flat side to the back as far up
as it will go into the needle holder and tighten the
screw.
Incorrect needle point.
> Match the needle point to the texture of the material.
Upper thread breaks
Incorrect needle/thread
combination.
> Match the needle with the thread size.
Upper thread is too tight.
> Reduce the upper thread tension.
Incorrectly threaded.
> Rethread.
Poor quality thread.
> Use quality thread.
The stitch plate or the hook tip is
damaged.
> Contact a specialized bernette dealer to have the
damages repaired.
> Replace the stitch plate.
