Tension Problems / Loops
Singer Sewing Machine
Severity: ModerateWhat Does This Error Mean?
Tension problems show as loops on the top or bottom of the fabric. Loops on the bottom = top tension too loose. Loops on the top = top tension too tight (or bobbin tension wrong). Start by rethreading with presser foot UP, then adjust the tension dial.
Affected Models
- Singer Heavy Duty 4423
- Singer Heavy Duty 4452
- Singer Quantum Stylist
- Singer Start 1304
- All Singer machines
Common Causes
- Top thread not in tension discs (threaded with foot down)
- Tension dial set incorrectly
- Bobbin wound unevenly
- Wrong bobbin type
- Lint in the tension discs
- Different thread weights on top and bobbin
How to Fix It
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Rethread with the presser foot UP.
This is the #1 fix. The presser foot opens the tension discs. Threading with the foot down = thread skips the discs = no tension.
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Set tension to 4 (default) and test on scrap fabric.
4 is the starting point for most fabrics with standard thread. Increase for heavy fabric, decrease for lightweight.
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Check the bobbin.
Remove and reinsert the bobbin. Make sure it is wound evenly. A poorly wound bobbin causes uneven tension.
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Clean lint from the tension discs.
Slide a piece of muslin between the tension discs with the foot up. Pull it through to remove lint buildup.
Frequently Asked Questions
What does correct tension look like?
The stitches should look identical on both sides of the fabric. The threads meet in the middle of the fabric layers — not showing loops on either side.
Should I adjust bobbin tension?
Rarely. Top tension handles 95% of adjustments. Only adjust bobbin tension as a last resort — it is factory-set.