The machine does not make stitches
Needle is turned, bent or the point is dull.
Replace the needle.
Refer to How do I change the needle?
Bobbin is set incorrectly.
Reset the bobbin thread correctly.
Refer to How do I set the bobbin?
Upper threading is incorrect.
Check the steps for threading the machine and rethread the machine correctly.
Refer to How do I thread my machine?
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