Question about Bernina Sewing Machines

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I have a faithful 730 Bernina and currently the bobbin thread keeps breaking. Please advise what may be causing this. Thanking you.

My faithful 730 Bernina is currently breaking the bobbin thread. Can you help Roz

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2 Answers

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  • Bernina Master
  • 7,365 Answers

Bobbin thread breaks
1. There is a right way & wrong way to insert the bobbin in the case --when you insert the bobbin in if it doesn't stitch correctly turn the bobbin over see if that helps or bobbin case is not inserted correctly
2. Lint has collected in the bobbin holder
3. The bobbin is damaged & doesn't turn smoothly
4. Lower thread tension is two tight

here's a free manual
http://www.bernina.com/getdoc/48e8d09f-98f7-40ab-8663-a23663df4fae/Bernette_715_730_740E_manual

Posted on Sep 18, 2012

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  • Bernina Master
  • 12,731 Answers

First, clean and oil your machine, especially in the bobbin area.

For your model, the bobbin should be placed in the bobbin case so the bobbin spins clockwise in the case. Make sure the bobbin thread is slipped into the bobbin case properly. After you've loaded the bobbin thread in the bobbin case, can you easily pull the thread or is it hanging up?

Are you using thicker-than-usual thread, or is the thread old?

Posted on Feb 23, 2015

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

chrismyers67
  • 53 Answers

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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Posted on Jun 07, 2010

RickE1
  • 202 Answers

SOURCE: Bernina 180 - winding thread onto bobbin spool

Also it is quite possible that the small circuit board (P-print) just below the bobbinwinder that the motor plugs into has gone bad.

Posted on Nov 27, 2008

mohammed387
  • 1952 Answers

SOURCE: bobbin thread keeps breaking and bunching up

check ur bobbin holder

Posted on Dec 11, 2008

  • 1 Answer

SOURCE: Bicor vx1005 ...thread keeps bunching

Try a different bobbin. Look for one that is a little narrower. I had the same problem and changing to a narrower bobbin fixed it.

Posted on Mar 29, 2009

Mongo32
  • 111 Answers

SOURCE: I have a Bernina Activa 130. The bottom threads

bunching threads bunching means that upper tension or threading is wrong

Posted on Jul 08, 2009

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1 Answer

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My Bernina 1090 keeps breeaking the bottom thread. It sews about 10 inches and breaks. I take out the bobbin and rethread and it sews a while but still breaks. I have had it in for service 3 times and...


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Viewer states problem - but cannot correct.


Hi, if you look in the bobbincase you will see a round spring. Sometimes this gets moved and it blocks the hole the sensor reads through. Clean inside the bobbincase with a q-tip. Also clean the sensor lens on the door with a q-tip. Also try rewinding a bobbin but don't start with the thread through a hole in the bobbin.
Hope this helps.
Rick

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I know this is a long-overdue response, but maybe it will help someone else. I had the same problem, and it turned out that the cause was that my bobbins had oxidized. Rubbing them with a bit of steel wool or fine-grain sandpaper did the trick, and I was up and running again.

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