Make sure top tension is correct for the thread and material. Make sure that the bobbin is wound correctly. Not more than 80% thread. Make sure needle is threaded correctly and the needle is pushed all the way up, flat side at back. I have been sewing for years and I sometimes have not threaded my needle correctly so it?s easily done. :-)
SOURCE: janome straight stitch loose
I don't know if this is the right answer for any of you, but thought I'd put my 2 cents worth in. Often this can be the bobbin in backwards. It needs to unwind a certain way depending on the machine. I've heard a phrase for this: Mind your p's and q's which means some wind off to the right like a q, others to the left like a p. Mine has to unwind one way then be slipped backwards into a little slot or it does that loose bottom thread looping and bunching someone here mentioned. It seems everytime I get that problem I rethread the top thread 100 times before it clicks again and I remember it could be the bobbin thread. Either your manual will tell you the correct way, or you could experiment and try one or the other. Once you figure out whether you're a p or a q, mark it on your machien somewhere to remind yourself.
Good Luck and Happy Sewing!
SOURCE: will not pick up bobbin thread
Unusual for this machine. Check to be sure the needle is inserted with the flat side to the back of the machine. If it is, remove the needle plate, bobbin and bobbin case. Turn the hand wheel slowly toward you and see if the point of the hook is above or below the eye of the needle when the hook point is aligned behind the needle. If the eye is above the point of the hook the machine is out of time and best taken to qualified technician.
SOURCE: Top thread keeps breaking on my Janome 1600P.
I had a similar problem and then realized that the thread on the top had a **** on the spool it was catching on.
SOURCE: top thread keeps breaking
This sounds like a backwards needle. Take out the needle and when you re-insert it back in, make sure that put the flat side to the back.
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