Loopy thread on bottom stitching Bernina 931 machine

SOURCE: Bernina Aurora 430

I figured out the solution for this issue. It all has to do with the threading. And I mean literally follow the instructions word for word. Most importantly is the Bobbin thread. make sure to thread the bobbin through the case eyelet.

SOURCE: Bernina Bernette 600 Deco embroidery machine

It could be that there is a loose piece of thread, or some fluff which is obstructing the tension gauge. Try blowing around the theading area (or even run the hoover pipe near it to see if you can **** it out). I cleared mine by folding a piece of non fluffy material and rubbing gently between the tension dial and machine.

Good luck

SOURCE: Bernina 1130 not catching bobbin thread

there will be a adjustment in that you should select the stiching mode and in that give the straight mode the problem will be solved

SOURCE: Top stitch looks good, bottom stitch is loopy

this is a common problem, don't worry it's easy to fix.  take the spool of thread off, remove the bobbin.  look for any stray thread pieces in or around the bobbin case, rethread the top of the machine and when you do, follow the threading guide precisely and ---here's the trick---make certain that the thread goes between the tension discs.

SOURCE: bernina 1008 - tension problems

Make sure the presser foot bar is UP before you thread the machine, otherwise the thread doesn't connect propertly with the tension discs. Top thread should reel-off in clockwise direction.