The needle threader cannot be used.
There could be several reasons why the needle threader cannot be used.
Check the following points or issues.
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The needle is not installed correctly.
Correctly install the needle.
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Needle is turned, bent or the point is dull.
Replace the needle.
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Recommended needles are not used on this machine.
Replace and use recommended needle.
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The hook on the automatic threading mechanism is bent.
Consult your nearest authorized Brother dealer.