The upper ; The lower ; thread is - Page 49

Brother ST371HD Use and Care Manual

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48

6

The needle is bent or blunt.

Replace the needle.

7

The upper 

thread 

breaks.

The needle is incorrectly installed.

Correctly install the needle.

7

The area around the hole in the needle 

plate or the presser foot is scratched.

Replace the needle plate.

Contact your retailer or the nearest 

authorized service center.

The bobbin case is scratched, or has a burr 

on it.

Replace the bobbin case.

Contact your retailer or the nearest 

authorized service center.

You have not used a bobbin that has been 

designed for this machine.

Use a bobbin that has been designed for 
this machine.

15

The lower 

thread is 

tangled or 

breaks.

You have not wound the bobbin thread 

properly.

Wind the bobbin thread properly.

15

The bobbin is scratched or does not turn 

smoothly.

Replace the bobbin.

The thread is tangled.

Remove the tangled thread and clean 

the race.

45

You have not used a bobbin that has been 

designed for this machine.

Use a bobbin that has been designed for 
this machine.

15

Bobbin is set incorrectly.

Reset the bobbin thread correctly.

18

The thread 

tension is 

incorrect.

You have not threaded the upper thread 

properly.

Correct the upper threading.

20

You have not wound the bobbin thread 

properly.

Wind the bobbin thread properly.

15

You have not threaded the right 
combination of thread and needle for the 
fabric you are using.

Choose a thread and needle that are 

appropriate for the type of fabric. 

26

You have not attached the presser foot 

holder properly.

Attach the presser foot holder properly.

The thread tension is incorrect.

Adjust the tension of the upper thread.

31

You have not used a bobbin that has been 

designed for this machine.

Use a bobbin that has been designed 
for this machine.

15

Bobbin is set incorrectly.

Reset the bobbin thread correctly.

18

The fabric is 

wrinkled.

You have not threaded the upper thread 

properly or fitted the bobbin properly.

Thread the upper thread and wind the 

bobbin thread properly.

15-24

You have not fitted the spool properly.

Fit the spool properly.

16, 29

You have not used the right 

combination of fabric, thread and 

needle.

Choose a thread and needle that are 

appropriate for the type of fabric.

26

The needle is bent or blunt.

Replace the needle.

7

If thin fabrics are being sewn, the fabric is 

not being fed correctly.

Sew with stabilizer material under the 

fabric.

29

If thin fabrics are being sewn, the stitch is 

too coarse.

Shorten the stitch length.

14

The presser foot you are using is not 

appropriate for the type of stitch that you 

want to sew.

Attach the presser foot that is correct 

for the type of stitch that you want to 

sew.

42

Symptom

Possible cause

How to put it right

Page

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