The bobbin thread cannot be pulled up.
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 install the bobbin wound with thread ?
Upper threading is incorrect.
Check the steps for threading the machine and rethread the machine correctly.
Refer to How do I thread my machine ?
BC-2100/BC-2100PRW, BC-2500, CS-6000/6000b/6000t, DS-120, DS-140, FS101, FS155, FS50, FS60X, FS70, FS80X, GS2500, GS2510, GS2520, GS2700, GS3700, GS3710, GS3750WT, J17s, JA1400, JS1400, JS1410, JS1420, JS1700, JV1400, LX27NT, SL100, SL170, SL300, TY200A, TY400G, XT37
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