Be sure to install a brand new needle of the type suitable for the fabric you are sewing.
All About Needles
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Use a thread that is suitable for the fabric. If you are sewing fine, light-weight fabric, use a fine thread--
avoid old or bargain bin thread. Use the same upper thread in the bobbin.
When threading,
always raise the presser foot so the thread will seat properly in the thread tension and verify that the thread path is correct (consult the manual).
Standard tension is usually the midway point between high & low number. The stitch length could be set a little higher than a 2--maybe a 2.25 or 2.5 for light fabric.
Since you are sewing fine fabric, it sometimes helps to use a removable stabilizer to give the fabric some extra body while stitching--perhaps a wash-away stabilizer if the fabric is washable.
Test your machine on scraps of the fabric you will be sewing. Re-adjust the tension as needed. The correct tension is when both upper and bobbin threads meet in the middle of the fabric.
If the thread continues to break, then there could be a burr or nick somewhere that is catching the thread and causing it to break. Could also be a needle/hook timing issue.
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