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This happened to me on several occasions and finally one service tech told me not to use the needle down auto button. Instead when threading the bobbin just move the wheel toward you slowly until the thread catches.
Paul... youtube it.... It's really not difficult. Have to load bobbin with thread first... install bobbin (under the needle plate in its holder) thread cotton from top of machine through the correct catch points to the needle.... catch the thread from the bobbin..... pull threads under pressure foot (but look in youtube... loads of vids)
try changing the needle rethread the machine top & bobbin make sure to use every thread guide make sure the bobbin is not over wound make sure the bobbin is turned the right way in the bobbin case make sure the bobbin is not warped or damaged if you've done all these things then it's also possible that the machine is out of time & needs to be checked at a repair shop
Upper thread breaks
needle may be in backwards
Raise the needle bar to the highest point then loosen the clamp screw to remove the old needle, place the new needle in the clamp with the flat side to the back of the machine
Push the needle all the way up to the stop or as far as it will go, then tighten the needle clamp screw
upper tension may be to tight
the needle may be bent or damaged
Lower thread breaks
The most probable cause of lower thread breaking is improperly wound bobbin
don't wind the bobbin so full that it would be tight & hard to insert into bobbin case
thread catching on the bobbin spring or latch on bobbin case check to see that the bobbin is inserted completely & correctly & that you are using the right kind of bobbin .
Make sure the bobbin has a 3-5 inch thread tail
Then make sure the top thread has a 3-5 inch tail
Then hold the top thread tail with your fingers (away from the needle)
& use the hand wheel on the right hand side of the machine to slowly
Lower the needle in the bobbin area & see if the bobbin thread will pick
Up that way