Troubleshooting
158 Service Instructions 867-M PREMIUM - 03.0 - 05/2017
24.2 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 the 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 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, hook or spread
have been damaged by the
needle
Have parts reworked by qualified
specialists
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