Troubleshooting
136 Service Instructions 867 - 04.0 - 10/2019
Skip 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
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 hook
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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