sewing machine faults

Question 1

needle breaks

Answer 1

needle has been put in wrong
needle is blunt
fabric is too thick
sewing over zips and pins

Question 2

thread breaking

Answer 2

machine not threaded properly
thread to fine or poor quality
needle had been out in wrong

Question 3

looped stitches

Answer 3

top tension too loose
presser foot not down
machine not threaded properly

Question 4

slipped stiches

Answer 4

blunt needle
needle back to front
pushing of pulling fabric