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18.2 Troubleshooting
Fault
Uneven stitch formation
Uneven stitch formation
Cause
The calibration of the Buttonhole
foot with slide #3A has failed.
Cause
Upper thread too tight or too
loose.
Needle blunt or bent.
Poor quality needle.
Poor quality thread.
Incorrect needle/thread
combination.
Incorrectly threaded.
Fabric has been pulled.
Incorrect bobbin case is used.
Solution
> Check the presser foot for ease of movement. If
necessary, remove lint, dust and fabric remnants.
> Clean the reflector with a soft, slightly damp microfiber
cloth.
> Check the position of the reflector. If necessary, correct
the position of the reflector or replace the presser foot.
> Check the plastic on the underside of the presser foot
for signs of wear. If necessary, replace the presser foot.
> Clean the feed dog.
> If the error still occurs, contact your authorized BERNINA
dealer.
Solution
> Adjust the upper thread tension.
> Check the thread feed from the thread spool.
> Replace the needle, make sure that a new BERNINA
quality needle is used.
> Use a new BERNINA quality needle.
> Use quality thread.
> Match the needle with the thread size.
> Rethread.
> Feed the fabric evenly.
> Use the supplied bobbin case marked with the triangle.
Errors and faults
173
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