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check the age of the cotton
cotton is not a single thread but a series of fine threads bonded with a glue
old cotton glue breaks down and the thread separates easilty
next check that the needle is installed correctly with the grove ( thread groove away from the bobbin hook
check the needle and hook timing because if it is off a fraction , the hook will pierce the the thread causing it to break
next check that the eye is the correct size for the thread in use
a needle eye too small for the thread thickness will jam the thread ans not let slide through the eye properly
The thread sensor could be dirty or broken. If you can find it and clean it, the issue may be taken care of. Also, be sure to ALWAYS RAISE the presser foot when threading the top thread.
ALWAYS RAISE the presser foot when threading the threads. When threading the tension disks, stop and give each thread an extra little tug to confirm it is seated in the tension disk.
It could be there is still some lint or broken thread hiding somewhere. Or the thread sensor is sensing thread where this is none. Perhaps it has lint or even a fingerprint on it.
A blunt needle can also cause this. Try pulling a button thread or any slightly thicker thread through all the tension springs, perhaps you have a blockage somewhere.
Did you thread it when the pressure foot was up? It must always be threaded with the pressure foot up as this disengages all the tensions. Also try re-threading as sometimes the thread misses a tension disc. If the bobbin is threaded wrongly it can also cause thread pulling. If the thread is poor quality it may have knots that cause this problem.
I would suggest removing all threads and cleaning between any visible tension discs incase there is a piece of broken thread stuck in there, then re-thread the whole machine with pressure foot up.
You have a great machine. These are hard to thread but once you have mastered it, you'll have many years of great use. The owner's manual has instructions, as well as the inside door of the machine (the door that folds down on the front bottom part of the machine. However, you might want to follow-up with your local authorized Husqvarna Viking dealer. Most are eager to help you even if you didn't purchase the machine from them. Some even have classes on using the serger. You might try several stores in the area. Suggest that it be serviced and cleaned by an authorized Husqvarna Viking Dealer. You can find the nearest dealer by click on the "Dealer" link at http://www.husqvarnaviking.com
Good luck.
One fundamental tip is to follow the color coding, start with green, then blue/navy, then red, and finally yellow. The sequence is work inside to outside with threading (green - blue - red - yellow). Do not try different order--especially with green and blue -- since the threads build on each other. I have switched yellow and red with no impact but green then blue is always the proper order.
You could have the bobbin in backwards??? You may want to try switching it around. You can always download a manual online they are about $5-10 and show you exactly how to thread your machine.
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