Hello Rosemary
Looped thread on the underside are created by the upper thread. Loops on the top of the fabric are created by the bobbin thread. Whichever one is looping, has very little tension. This may be corrected by:
1. Re-threading the upper thread according to manufacturer's specifications.
2. Re-wind bobbin and re-set it into bobbin case and bobbin case area according to manufacturer's specifications.
3. Ensure that the needle is correctly installed and is the correct needle for the sewing machine.
4. Ensure that he bobbin being used is the correct one for the machine.
5. Double check that the tension on the upper thread is at the correct setting.
6. Double check that the tension unit is clean and free of dust, lint or lodged thread/s.
7. Double check that the bobbin tension is correctly set ... if you are comfortable doing so, otherwise leave it for a qualified technician
8. Make sure that he presser foot is down when stitching.
Please let me know how you go.
Happy stitching.
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