Here are a few sites that may be helpful in diagnosing your problem:
NUMBER ONE SUGGESTION--install a brand new needle. Sewists are known to be very frugal about changing needles but it is usually the easiest and least expensive fix for a lot of problems.
Remove all the thread from your machine, clean the bobbin area of any lint, threads, etc. Be sure that you RAISE the presser foot BEFORE you thread the upper thread. This releases the tension disks so the thread will seat properly. Now, re-thread from the beginning verifying you are following the correct threading sequence (consult your manual).
The standard factory tension setting is the midpoint, ie of the range is 1-10, set the tension at 5 and then adjust from there.
Why is my thread breaking
Why Does My Top Thread Keep Breaking Sewing Machine
Why Does My Thread Keep Breaking While Sew
Sewing Machine Problem 1 Thread Breakage
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One of three issues: top tension too tight, bottom tension too tight, needle timing off.
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