Troubleshooting
156 Service Instructions 869-M PREMIUM - 00.0 - 07/2018
23.2 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
Missing stitches Needle thread and hook
thread have not been
threaded correctly
Check threading path
Needle is blunt or bent Replace needle
Needle is not inserted
correctly into the needle
bar
Insert the needle correctly into
the needle bar
The needle thickness used
is unsuitable
Use recommended needle
thickness
The reel stand is
assembled incorrectly
Check the assembly of the reel
stand
Thread tensions are too
tight
Check thread tensions
Throat plate, hook or
spread have been
damaged by the needle
Have parts reworked by qualified
specialists
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