54
Troubleshooting
Problem Cause Solution Page
Upper thread
breaks
Upper thread is not correctly threaded.
Rethread upper thread. 18
Upper thread tension is too tight.
Lower upper thread tension. 20
Needle is bent or dull.
Replace needle. 12
Needle is not inserted properly
.
Insert needle properly. 12
Thread is either too thick or too thin
.
Choose the right thread
referring to the needle and
thread chart.
13
Lower thread
breaks
Bobbin thread tension is incorrect. Bobbin case is threaded in-
correctly.
17
Bobbin case and/or hook are blocked
by lint.
Clean bobbin case and/or
hook.
49
Bobbin case is damaged or malfunctioning. Replace bobbin case. 15
Needle breaks
Needle is not correctly inserted
.
Insert needle correctly. 12
Needle is bent or dull.
Replace needle. 12
Needle clamp screw is loose.
.
Tighten needle clamp
screw.
12
Upper thread tension is too high. Lower upper thread tension. 20
Needle is too thin for the fabric to be sewn. Use appropriate needle. 12, 13
Skipped stitches
Needle is not correctly inserted
.
Insert needle correctly. 12
Needle is bent or dull.
Replace needle. 12
Neither needle nor thread are right for
the fabric to be sewn.
Use the correct needle and
thread for the fabric.
13
Upper thread is not correctly threaded. Rethread upper thread. 18
