Dürkopp Adler 868-M Operating Instructions Manual page 149

Troubleshooting
Operating Instructions 868-M - 01.0 - 12/2020
Error Possible causes
Loose stitches Thread tensions are not
adjusted to the sewing
material, the sewing
material thickness or the
thread used
Needle thread and hook
thread have not been
threaded correctly
Needle Needle thickness is
breakage unsuitable for the sewing
material or the thread
Remedial action
Check thread tensions
 p. 47
Check threading path
 p. 28
Use recommended needle
thickness  p. 149
147