Troubleshooting
Operating Instructions 171/173 - 02.0 - 09/2019 97
Missing
stitches
Needle thread and looper
thread have not been
threaded correctly
Check threading path
Needle is blunt or bent Replace the 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 installed
incorrectly
Check the assembly of
the reel stand
Thread tensions are
too tight
Check thread tensions
Throat plate, looper or
spread have been
damaged by the needle
Have parts reworked by
qualified specialists
Loose stitches Thread tensions are not
adjusted to the sewing
material, the sewing
material thickness or the
thread used
Check thread tensions
Needle thread and looper
thread have not been
threaded correctly
Check threading path
Needle
breakage
Needle thickness is
unsuitable for the sewing
material or the thread
Use recommended needle
thickness
Error Possible causes Remedial action
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