17
Troubleshooting
Fault Cause Solution
Uneven Stitch Formation
Upper thread too tight or
too loose.
- Adjust the 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.
Sto wurde gezogen. - Feed the fabric evenly.
Dust or thread remnants
under the tension spring
of the bobbin case.
- Clean the hook.
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 at 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.
Faulty Stitching
Thread remnants be-
tween the thread tension
discs.
- Fold a piece of thin material and slide the
folded edge (not the raw edges) between
the thread tension discs.
Incorrectly threaded. - Rethread.
Thread is caught in the
hook.
- Remove the upper thread and the bobbin
case, turn the handwheel backwards and
forwards by hand and remove the thread
remnants.
Incorrect needle/thread
combination.
- Check the needle/thread combination.
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.
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