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Trouble shooting guide
Problem
Cause
Upper thread
1.The machine is not threaded correctly
breaks
2.The thread tension is too tight
3.The thread is too thick for the needle
4.The needle is not inserted correctly
5.The thread is round wound the spool holder
pin
6.The needle is damaged
Lower thread
1.The bobbin case is not inserted correctly
breaks
2.The bobbin case is threaded wrongly
3.The lower thread tension is too tight
Skipped stitches
1.The needle is not inserted correctly
2.The needle is damaged
3.The wrong size needle has been used
4.The foot is not attached correctly
Needle breaks
1.The needle is damaged
2.The needle is not correctly inserted
3.Wrong needle size for the fabric
4.The wrong foot is attached
Loose stitches
1.The machine is not correctly threaded
2.The bobbin case is not correctly threaded
3.Needle/ fabric/ thread combination is wrong
4.Thread tension wrong
Seams gather or
1.The needle is too thick for the fabric
pucker
2.The stitch length is wrongly adjusted
3.The thread tension is too tight
Uneven stitches,
1.Poor quality thread
uneven feed
2.The bobbin case is wrongly threaded
3.Fabric has been pulled
The machine is
1.The machine must be lubricated
noisy
2.Fluff or oil have collected on the hook
or needle bar
3.Poor quality oil has been used
4.The needle is damaged
The machine
Thread is caught in the hook
jams
Correction
1.Rethread the machine
2.Reduce the thread tension (lower number)
3.Select a larger needle
4.Remove and reinsert the needle (flat side
towards the back)
5.Remove the reel and wind thread onto reel
6.Replace the needle
1.Remove and reinsert the bobbin case and pull
on the thread. The thread should pull easily
2.Check both bobbin and bobbin case
3.Loosen lower thread tension as described
1.Remove and reinsert needle (flat side towards
the back)
2.Insert a new needle
3.Choose a needle to suit the thread and fabric
4.Check and attach correctly
1.Insert a new needle
2.Insert the needle correctly (flat side towards
the back)
3.Choose a needle to suit the thread and fabric
4.Select the correct foot
1.Check the threading
2.Thread the bobbin case as illustrated
3.The needle size must suit the fabric and
thread
4.Correct the thread tension
1.Select a finer needle
2.Readjust the stitch length
3.Loosen the thread tension
1.Select a better quality thread
2.Remove bobbin case and retread and insert
correctly
3.Do not pull on the fabric while sewing, let it be
taken up by the machine
1.Lubricate as described
2.Clean the hook and feed dog as described
3.Only use good quality sewing machine oil
4.Replace the needle
Remove the upper thread and bobbin case, turn
the handwheel backwards and forwards by hand
and remove the thread remands.
Lubricate as described
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