Dürkopp Adler D869 e-con Service Instructions Manual page 228

Error
Loose stitches
Needle breakage
226
Possible causes
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 thickness is
unsuitable for the sewing
material or the thread
Service Instructions D869 e-con - 00.0 - 09/2023
Troubleshooting
Corrective
Check thread tensions
Check threading path
Use recommended needle
thickness