Question about Bernina 2500DCET

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Coverstitch Three thread 5mm coverstitch - right thread keeps breaking. Have checked and rechecked threading. Help

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  • Bernina Master
  • 11,482 Answers

Cut all the threads above the tension disks and pull them all out. Then rethread from the very beginning making sure to thread in the Proper Order.

Posted on Apr 03, 2015


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Posted on Jan 02, 2017


SOURCE: error message

tell me what to look at to fix the problem

Posted on Jul 25, 2007

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SOURCE: I've lost my manual and video need threading info

I had the same problem. I found if you turn the wheel three times and then put in material, it will work fine. If you try to run a long thread to see if it works, the lower looper will break. Try it with material and it will work fine.

Posted on Aug 15, 2007

SOURCE: Brother 1034D

You either have a burr on one of the loopers, or you have threaded the loopers in the wrong order. I do not have this particular serger, but with mine, if I the lower looper thread is looped above the upper one(down where they all meet), it will break. Cut your lower looper thread and re thread it making sure its above the lower looper one.

Posted on Jun 12, 2008

  • 323 Answers

SOURCE: Repeated message: "Please Check the Upper Thread."

The machine stops because the sensor near the check spring(in the tension area) tells it the thread is broken or not there.. You can try to clean it out again but it's probably going to have to go in for service.


Posted on Jun 19, 2008

  • 15 Answers

SOURCE: Coverstitching on White Speedylock serger

FYI, a mock or faux coverhem stitch can be done, in conjunction with your sewing machine and the serger. Takes a bit longer than using an expensive coverhem machine but looks almost the same.

1. Make sure your hem is even and serge the edge using a 3-thread overlock stitch.
2. Iron a 1-inch hem. (Fold 1-inch to the back, wrong sides together) -- Measure to keep it even.
3. Using your sewing machine, you can get a double needle that will fit inside the zig zag hole of the needle plate -- if too large it will break -- and then thread both needles using two spools of thread and stitch on the right (top) side over the ridge that you can see that is from the overcast stitch -- it will be thicker to the touch. Slowly stitch all the way around. I start on the side seam and stitch over a couple of stitches to lock it. If you have ironed a neat hem, it will come out very nice.

If you have to use a single needle, then use a quilting guide bar attachment to follow the first row of stitching to get an even second row.

This can be done on sleeves and bottom hem. Stretch the material slightly to help avoid pulled and broken stitching when wearing.

Posted on Oct 25, 2008

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My Janome keeps breaking its thread on both of my machines-Help!

Check that the needle is in the right way - usually with the flat side away from you, but check your manual. While you have the manual out check that the bobbin is turning the right way too. Hope you fix it

First - check to be sure you have the machine threaded correctly - if the upper thread path is wrong it will break the thread every time you try to sew.

Try this link for more info:

Sewing Machine Thread Keeps Breaking

Here is a useful document of this machine:

Apr 13, 2015 | Janome Sewing Machines

1 Answer

How to thread a husky overlock s-25 for coverstitch from the begining

check your manual for instructions and or see your Viking dealer for help.

Jun 29, 2014 | Husqvarna Huskylock Computerized 936

1 Answer

Can you do a coverstitch on the Brother 634D serger

I don't think so, the D in your model name would denote that it has Differential feeding but is probably a 3/4 Marrowing stitch only. So this means it would do 3 thread overlock, 4 thread overlock and you can probably set it up for rolled hemming too.

Coverstitch is fairly new to home sergers and is available on some machines along with the 3 and 4 thread stitches, but changing between the regular overlock and a coverstitch takes a few minutes. The model number will usually have a "C" in the name. Also, during coverstitch the blades are disenaged and don't trim your fabric so you still need often to go back with blunt scissors and trim the raw edge.

And sewing coverstitch can be finicky, with skipped stitches a problem. Use high quality thread and XL (extra long) or SUX (stretch extra long) needles to avoid this.

However some manufacturers are now making dedicated coverstitch machines; if you are assembling a garment with your regular serger, you can then just move over to the coverstitch machine to sew the hems and necklines and not spend 20 mins changing over your machine's functions. Much more productive.

You may wish to check out the Brother 2340CV, this is their dedicated domestic coverstitch machine. Link to product info is

In the meantime, best solution is a twin needle to stitch the hem from the right side of the garment on your regular sewing machine, looks much the same, and you can get twin needles with a 4mm or 2.2 mm gap and in stretch and sharp tips for less than $10 each. Just iron up the hem about 1.5cm deep, and thread up your sewing machine with the twin needle and two spools of same colour on top (I just wind an extra bobbin and use this plus the original thread spool rather than buy two spools).

Just sew really slow as the twin needle builds up a lot of heat and will break if you push it along. I use this finish on all my knit garments and it works just fine. Sometimes I'll iron in a 2cm strip of fusible web inside the hem to give it some firmness in a neckline, then twin needle stitch at about 1.7 from the folded edge.

Hope this answers your question.

Oct 23, 2011 | Janome MyLock 634D Mechanical Sewing...

1 Answer

Keeps stripping cotton until it breaks

Probably a problem with either your top tension being way too tight (high) - turn it down. CHeck this first and if you have never cleaned out the tension device, then check your manual and clean it now. It is usally a matter of turning the tension right down to zero, raising the pressure foot, and "flossing" between the tension discs with a clean piece of waste fabric. But each machine is different so check the manual to see if this area can be accessed and cleaned.

Or the thread is caught/catching on something in the threading path.

Recheck your threading fully from spool to needle and look to see if the thread has wrapped twice around anything like the take up lever or a thread eyelet.

Some thread spools have a little notch to hold the thread tail when putting away and if the thread has caught in this, this will certainly stop it from running freely and make it break so always check this first and put the spool up the other way or use a mushroom cap over it to help the thread run freely off the spool.

Is the needle bent or burred as this could also cause stripping of the thread.

Sep 07, 2011 | Sewing Machines

1 Answer

I have a new Viking Huskylock S25 and the serger tensions are off and I cannot get them adjusted.

How do you mean the tension are off? A serger should have 3 or 4 tension knobs (although yours looks like it is push button digital settings) and generally from new these will produce a standard stitch when all are set to 5. Are you sure that you've got the thread pulled into the tension discs fully? Check each one by pulling on the thread below the tension disc and feel for resistance, if the thread pulls very easily, then recheck and thread again.

Have you got the thread aerial raised up to the full height? Remember also to put the plastic cone holders under the thread cones as you want the cone to stay still and the thread to feed off it - it does this very fast, sergers sew at 1500 stitches per minute so the thread streams off the cones very quickly.

Using a serger is quite different to a sewing machine and your model looks like its one of the later computerised ones with multiple stitch options including coverstitch. I'd suggest that you go back to your dealer and ask to spend time with them for a demo, thread up in front of them for pointers or take a class to familiarise yourself fully with the machine. Then go home again, break out the manual, and go through threading up from scratch several times until you've got it off pat. Remember to thread top looper, bottom looper, left needle, right needle in this sequence always, then pull all threads under the foot, lower pressure foot and serge off a short chain. To change colour thread, you can always cut and knot on new threads, turn tension down and pull through the loopers, but you've got to thread the needles fresh each time you change colour.

There is some good videos on You-tube, Nancy Zieman has a several and she's also written several books on using a serger and obviously the manual is first point of reference.

Each fabric will behave differently so for each new fabric, you will need to adjust tensions and move the blade to get it stitch and just encasing the cut edge at a suitable width. To work out how it should look, break out some ready to wear garments and have a look at those seams, then test and practice with your machine to get a similar stitch. Always test serge two thickenesses if you are going to use it to construct your garments and pull open from the right side to ensure the needle thread is tight enough so the seams don't pull open under wear.

Good idea to keep your test seam samples in a notebook and write down the settings you used for reference next time. I have to say, I've done flatlock with silky decorative thread once in 19 years - but I do know how to set up the machine for this. However, rolled hem with wooly thread is very useful and I often use this to edge hems. I'm envious of your coverstitch option, this is great for hemming and necklines and is something early sergers didnt do.

Just checked out this model on an Ebay vendor's site and it mentions a training DVD, you've got several different stitch types to master with this machine so there will be some learning and practice involved to get it right. Good luck - I hope this is of some help but I'd be visiting the dealer for specific help if you can.

Apr 29, 2011 | Sewing Machines

1 Answer

Coverstitch tensions to tight

Coverstitch machines are very particular when it comes to thread. Use only MaxiLock cone thread. Do not use TruSew or SureLock thread. This can make the difference between working beautifully or not at all.

Jul 11, 2009 | Sewing Machines

2 Answers

Brother Embroidery machine thread keeps breaking

the needle thread tension is wrong
bunching up under the material indicates that it is too loose

Nov 17, 2017 | Sewing Machines

5 Answers

Coverstitching on White Speedylock serger

Your machine cannot do a cover stitch. Check the Brother website, they make a cover stitch only machine, it works much better than any of the serger/cover stitch combination machines, and it is a lot less money.

Nov 19, 2007 | White Sewing Speedylock 1600 Mechanical...

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