Troubleshooting
In most cases you will be able to identify and remedy faults by checking the following.
Uneven stitch
formation
lower thread incorrectly threaded
upper thread incorrectly threaded
needle blunt or bent
poor quality needle
upper thread too tight/too slack
poor quality thread
needle/thread combination is incorrect
lower thread too tight/too slack
⦁
check the threading path of the lower thread
⦁
check the threading path of the upper thread
⦁
use new BERNINA quality needle
⦁
use new BERNINA quality needle
⦁
reduce/increase upper thread tension
⦁
use quality thread (Isacord, Mettler, Gütermann etc.)
⦁
match the needle to the thread size
⦁
reduce/increase lower thread tension
Skipped stitches incorrect needle system
needle bent or blunt
poor quality needle
needle/thread combination is incorrect
needle inserted incorrectly
incorrect needle point
⦁
use needle system 130/705H
⦁
use new BERNINA quality needle
⦁
use new BERNINA quality needle
⦁
match the needle to the thread size, refer to page 17
⦁
insert needle as far up as it will go
⦁
match the needle point to the texture of the material
Upper thread
breaks
Lower thread
breaks
Needle breaks
Faulty stitching
needle/thread combination is incorrect
upper thread tension too tight
incorrectly threaded
poor quality or old thread
stitch plate or hook tip damaged
lower thread tension too tight
stitch hole in the stitch plate has been
damaged
needle blunt or bent
needle not correctly inserted
fabric was pulled
fabric was pushed when using thick
material
poor quality thread with knots
thread remnants between between the
tension discs of the upper thread
tension
incorrectly threaded
⦁
match the needle to the thread size
⦁
reduce the upper thread tension
⦁
check the threading path of the upper thread
⦁
use quality thread (Isacord, Mettler, Gütermann etc.)
⦁
take the sewing computer to the nearest authorized
BERNINA dealer
⦁
remove thread remnants at the pre-tension carefully using
tweezers and check the thread lever if necessary, refer to
page 205
⦁
reduce the lower thread tension
⦁
take the sewing computer to the nearest authorized
BERNINA dealer
⦁
use new BERNINA quality needle
⦁
tighten the needle clamp screw
⦁
do not pull the fabric during sewing
⦁
use the correct presser foot for thick material (e.g. Jeans foot
No. 8) use height compensating tool when sewing over a
thick seam
⦁
use quality thread (Isacord, Mettler, Gütermann etc.)
⦁
fold a piece of thin material and slide the folded edge (not the
raw edges) between the thread tension discs, moving the
material sideways over the front and back of the thread
tension disc
⦁
check upper and lower thread
Fault Cause Repair
Various troubles can be eliminated by turning the sewing-/
embroidery computer off and turning it on again after 10 sec.
Check if:
⦁
the upper and lower threads are threaded correctly
⦁
the needle is inserted correctly
⦁
the needle size is correct - check the needle/thread table page 17
⦁
the needle tip and shaft are undamaged
⦁
the sewing computer is clean - brush out any thread lint
⦁
the hook race is clean
⦁
any threads are trapped between the tension discs or under the bobbin case spring
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