Barbara, if your question is how to get the garble of thread out of your hook on the 830, towards the end of 2010, Bernina came out with a special accessory kit for the Bernina 8-Series machines. It was free of charge to anyone who had purchased a machine prior to that date (to be obtained from your dealer) and the accessories in this kit were part of the the package if you purchased a machine after that time. In any event, the kit contains, among other things, a hook cleaning tool. It's a flat, stainless steel contraption with a hook at the end of it (almost looks like the bottom part of an anchor). Its purpose is to slide into the bobbin case so that you can pull out any extraneous threads that might have gotten caught in the hook but are not visible to the eye. If you don't have it, the bar code number on my kit is 033595.70.00, perhaps your Bernina dealer can help you get one. If you have one, follow the instructions carefully, it's not difficult but requires knowing what you're doing. I looked for a video on line but could not find one. Nevertheless, hope this helps put you in the right direction.

One more thing, but that has to be done before you get all the thread in the bobbin
Do you thread the machine slowly? When we thread it in the first eye, you have to wait until the light in the threader button goes on before you lay down the thread in the rest of the path. The computer has to be ready and I think the tension disks open while the light turns on.
Maybe this could be your main problem for the thing to happen.

On my old Bernini you could remove the bobbin race

Thanks Ladies. I will try your suggestions & let you know.

Oh, I feel your pain !! Take a few deep breaths and as Norma said,keep turning forward and back..
use a very bright light and maybe a few well chosen words....mine won't be printable !
Good luck !!

Try to oil it more and turn it with the hand wheel away from you a few times. Sometimes the thread will reveal itself and you can grab it with your tweezers. I hope this helps.

Once again I have done it to myself. I was sewing along nicely when I needed to change my thread colour. I know to put the bobbin in first & checked that it was threaded properly. Next I threaded the upper thread. When I began to sew I got the error message. So I opened the bobbin area & sure enough the upper thread had wrapped itself around the hook area & bunched up. As I began to unwrap it some of the thread broke off & now I can't get it out. I have tried unsuccessfully several times to insert a new bobbin & top thread to continue my sewing. Do any of you have a tip on how to get the errant thread out of the hook system?
Thanks
Barbara