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Error
Loose stitches
Needle breakage
258
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
Operating Instructions 550-D800 - 01.0 - 05/2023
Troubleshooting
Remedial action
Check thread tensions p. 36
Check threading path p. 24,
p. 26, p. 34
Use recommended needle thickness
p. 259
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