Symptom | Probable Cause | Remedy | Reference |
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| The upper thread was not threaded |
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| correctly (for example, the spool is |
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| not installed correctly, the spool cap | Correct the upper threading. | page 28 |
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| is too big for the spool being used, or |
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| the thread has come out of the |
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| needle bar thread guide). |
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| There are knots or tangles in the | Remove any knots or tangles. | – |
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| thread. |
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| The selected needle is not | Select a needle that is appropriate |
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| appropriate for the thread being | page 38 |
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| for the type of thread being used. |
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| used. |
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| The upper thread tension is too tight. | Loosen the upper thread tension. | page 57 |
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| The thread is tangled, for example, in | Remove the tangle thread. If the |
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| thread is tangled in the bobbin | page 149 |
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| the bobbin case. |
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| case, clean the race. |
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The upper thread |
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breaks. | The needle is bent or blunt. | Replace the needle. | page 39 |
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| The needle is incorrectly installed. | Correctly install the needle. | 4 | ||
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| The area around the hole in the | Replace the needle plate. Contact |
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| needle plate is scratched, or has a | your dealer or the nearest | – |
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| burr on it. | authorized service center. |
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| The area around the hole in the | Replace the presser foot. Contact |
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| presser foot is scratched, or has a | your dealer or the nearest | – |
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| burr on it. | authorized service center. |
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| The bobbin case is scratched, or has | Replace the bobbin case. Contact |
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| your dealer or the nearest | – |
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| a burr on it. |
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| authorized service center. |
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| A bobbin designed specifically for | Incorrect bobbins will not work |
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| properly. Only use a bobbin | page 22 |
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| this machine is not used. | designed specifically for this |
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| machine. |
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| The bobbin thread is incorrectly | Correctly install the bobbin | page 26 |
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| installed. | thread. |
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| The bobbin is scratched or does not | Replace the bobbin. | – |
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| rotate smoothly, or has a burr on it. |
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The lower thread is |
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The thread is tangled. | Remove the tangled thread and | page 149 |
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tangled or breaks. |
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clean the race. |
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| Incorrect bobbins will not work |
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| A bobbin designed specifically for | properly. Only use a bobbin | page 22 |
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| this machine is not used. | designed specifically for this |
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| machine. |
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Troubleshooting 161