| Symompt |
Root Cause |
Corrective Action |
- Sewing machine suddenly stops during sewing.
- Light is on, and hand wheel can be turned easily by hand.
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- Sewing machine has been run at a low speed for an extended period of time.
- To prevent overheating, motor power is automatically turned off.
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- Turn power off and wait about 20 minutes. Safety device will reset, and machine will be ready to operate.
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- Upper thread has run out.
- Presser foot is up.
- Bobbin winder shaft was left in winding position.
- Buttonhole lever was not lowered when machine was placed in buttonhole mode.
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- Replace empty spool and thread machine.
- Lower presser foot.
- Move bobbin winder shaft back fully to left.
- Lower buttonhole lever.
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- Sewing machine will not run.
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- Presser foot is not correct one, and needle hits presser foot.
- Needle has come out and is in hook of machine.
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- Replace presser foot with new one.
- Remove needle and insert new one.
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- Threading is not correct.
- Thread has a knot in it.
- Thread tension is too tight.
- Needle is bent or blunt or has a sharp eye.
- Needle is wrong size.
- Needle has been inserted wrong.
- Needle and thread does not match.
- Starting to stitch too fast.
- Thread take-up lever has not been threaded.
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- Correctly thread machine.
- Remove knot.
- Correct thread tension.
- Replace needle.
- Replace needle with correct size.
- Properly insert needle.
- Start machine at a medium speed.
- Use proper thread or needle.
- Check threading order.
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- Bobbin has not been fully inserted in bobbin case.
- Bobbin has been incorrectly threaded.
- Bobbin does not turn smoothly in bobbin case.
- Lint in bobbin case or shuttle.
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- Securely install bobbin into bobbin case.
- Correctly thread bobbin case.
- Check to see that bobbin has been wound evenly.
- Clean bobbin case and shuttle.
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- Thread tension is too tight.
- Needle is bent or blunt.
- Needle is wrong size.
- Needle and thread does not match.
- Thread take-up lever has not been threaded.
- Light pressure on presser foot.
- Incorrect setting of needle.
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- Correct thread tension.
- Replace needle.
- Replace needle with correct size.
- Use proper thread or needle.
- Check threading order.
- Increase pressure on presser foot.
- Reset needle.
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- Stitches are not formed properly.
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- Thread has not been pulled into thread sensor guide.
- Threading is not correct.
- Bobbin case has been threaded wrong.
- Spool cap is wrong size for thread spool.
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- Fully pull thread into thread sensor guide.
- Correct threading.
- Correctly thread bobbin case.
- Replace the cap with correct size.
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- Incorrect size needle.
- Improper threading.
- Loose upper thread tension.
- Pulling fabric.
- Light pressure on presser foot.
- Loose presser foot.
- Unevenly wound bobbin.
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- Choose correct size needle for thread and fabric.
- Rethread machine.
- Tighten upper thread tension.
- Do not pull fabric; guide it gently.
- Increase pressure on presser foot.
- Reset presser foot.
- Rewind bobbin.
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- Stitch length is too long for material.
- Needle point is blunt.
- Incorrect thread tension.
- Light pressure on presser foot.
- Fabric is too sheer or soft.
- Using two different sizes or kinds of thread.
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- Decrease stitch length.
- Replace needle.
- Reset thread tension.
- Increase pressure on presser foot.
- Use underlay of tissue paper.
- Upper thread and bobbin thread should be the same size and kind.
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- Upper and lower threads not drawn back under presser foot.
- Feed dog down.
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- Draw both threads back under presser foot.
- Raise feed dog.
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- A thin needle was used for sewing a heavy weight material.
- Needle has not been fully inserted into needle bar.
- Needle clamp screw is loose.
- Presser foot is not correct one.
- Presser foot is loose.
- Pulling on fabric as you sew.
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- Use correct size needle.
- Properly insert needle.
- Securely tighten needle clamp screw.
- Use correct presser foot.
- Reset presser foot.
- Do not pull fabric, guide it gently.
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- Loud noise is heard.
- Knocking noise, machine jammed.
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- Dust has accumulated in feed dogs.
- Lint is in hook.
- Thread caught in shuttle.
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- Clean machine.
- Clean machine.
- Disassemble machine and clean shuttle.
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- The machine does not feed material.
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- The stitch length has been set to zero.
- The presser foot pressure is too low.
- Feed dogs are lowered.
- Threads are knotted under fabric.
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- Reselect the proper stitch pattern and length.
- Set presser foot pressure adjustment lever to “normal”.
- Raise feed dogs.
- Place both threads back under presser foot before beginning to stitch.
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- Threading cannot be done.
- The needle threader will not turn.
- The threading hook will not enter needle eye.
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- The needle is not in highest position.
- The needle threader is designed not to turn to protect it self if the needle is not up.
- The needle has not been fully inserted into needle bar.
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- Turn hand wheel until needle reaches its highest position.
- Properly insert needle.
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- Needle threader cannot be returned and the sewing machine stops.
- The threading hook is left in the needle eye.
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- Sewing machine was accidentally started while threading hook was still in needle eye (during threading).
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- Slightly turn handle clockwise and remove threader.
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