Troubleshooting
118 Operating Instructions 513/533 - 01.0 - 09/2023
9.4 Errors in sewing process
Error Possible causes Remedial action
Unthreading
at seam
beginning
Needle thread tension
is too firm
Check needle thread
tension
Thread
breaking
Needle thread and hook
thread have not been
threaded correctly
Check threading path
Needle is bent or sharp-
edged
Replace needle
Needle is not inserted
correctly into the needle
bar
Insert the needle correctly
into the needle bar
The thread used is
unsuitable
Use recommended thread
Thread tensions are too
tight for the thread used
Check thread tensions
Thread-guiding parts, such
as thread tube, thread
guide or thread take-up
disk, are sharp-edged
Check threading path
Throat plate, hook or
spread have been
damaged by the needle
Have parts reworked by
qualified specialists
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