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Trouble shooting
In most cases you will be able to identify and remedy
faults by checking the following.
Check whether:
· the upper and lower threads are threaded correctly
· the needle is inserted correctly with the flat side to the
back
· the needle size is correct – check the needle/thread
table
· the machine is clean – brush out any thread fluff
· the hook race is clean
· any threads are trapped between the tension discs or
under the bobbin case spring
Upper thread breaks
· The upper thread tension is too tight.
· The needles are of a poor quality. Ideally needles should
be purchased from your BERNINA dealer.
· The needle has been inserted incorrectly. The flat side
of the shank must be to the back.
· The needle is bent or blunt.
· Poor quality, knotted or dried out thread has been
used.
· Use the correct spool disc.
· Stitch plate or hook tip damaged. Take your machine to
your BERNINA dealer.
Lower thread breaks
· The lower thread tension is too tight.
· The bobbin is jamming in the bobbin case.
Remove and replace the bobbin.
· The hole in the stitch plate has been damaged by the
needle. This must be repolished by an expert.
· The needle is blunt or bent.
Skipped stitches
· Wrong needles used. Use only 130/705H system.
· The needle is blunt, bent or incorrectly inserted.
Push right to the top when inserting.
· Needle inserted all the way to the top.
· The needle point does not suit the fabric being sewn.
If necessary use a ball point for knitted fabrics and
cutting point for hard leather.
Needle breaks
· Needle clamp screw loose.
· Fabric taken out in front of instead of behind the
presser foot.
· When sewing over thick area, the fabric was pushed
with the needle still in the fabric.
· Poor quality thread, unevenly wound or knotted.
Faulty stitching
· Remnants of thread between the tension discs.
· Remnants of thread under the bobbin case spring.
· Lower thread still threaded in the bobbin case finger.
· Machine threaded with foot down.
· Incorrect threading. Check upper and lower threads.
· Use the correct spool disc.
Machine fails to run or runs slowly
· Plug not properly inserted.
· Power switch in off position.
· Machine has been standing in a cold room.
· Bobbin winder still switched on.
Machine sews in reverse
Reverse sewing function is still activated.
Defective sewing light
Please note that it is forbidden to change the new CFL
sewing-light by a unauthorized person.
For models with this new CFL sewing-light, the light can
ONLY be replaced by an authorized BERNINA dealer.
Faults
31
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