Bernette DECO B70 - Errors and Faults; Troubleshooting Common Faults

Errors and Faults
77
2022-08 EN 5020070.40A.04
9 Errors and Faults
9.1 Troubleshooting
Fault Cause Repair
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.
Dust or thread remnants under
the tension spring of the bobbin
case.
> Remove any dust or thread remnants from under the
tension spring of the bobbin case.
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.