Husqvarna Viking produces sewing machines ranging from basic mechanical models to top-quality computerised embroidery and quilting machines. Thread tension and other adjustments are made automatically on computerised models; if your computerised Husqvarna Viking is experiencing problems with thread tension or other computerised adjustments, take your machine to a licensed sewing machine repair specialist. If you have a mechanical Husqvarna Viking sewing machine, you can troubleshoot many common adjustment, threading and needle problems on your own.
Double-check your machine's power cord and make sure it's plugged in firmly on both ends--to the machine's power connection socket and to the wall electrical socket.
Double-check that the machine is turned on.
Check the thread in the bobbin compartment. Make sure it is not tangled, and remove any tangled threads.
Check the bobbin winder. Make sure the spindle is not in the winding position.
Make sure the handwheel is in the sewing position.
Inspect your machine's threading. If it is threaded improperly, rethread the machine, taking care to thread it according to the user manual for your specific Husqvarna Viking model.
Loosen the needle thread tension according to the specifications in the user manual.
Inspect the needle. If it is damaged or bent, replace it. If the needle is incorrectly inserted, remove it and insert it again, taking care to place it as the user manual instructs.
Make sure that the needle and bobbin threads are positioned properly when you begin sewing. Both should be under the presser foot and pulled to the rear of the machine.
Make sure the bobbin is inserted and threaded properly, as per the user manual.
Examine the bobbin; replace it if it is worn or damaged.
Clean lint from the bobbin case by using a lint brush or the hose attachment of a vacuum cleaner.
Replace the needle, making sure the replacement needle is sharp and unbent.
Thread the new needle properly, as per the user manual.
Tighten the needle clamp screw.
Rethread the machine, taking care to thread as per the user manual.
Purchase and use a higher-quality needle.
Check the needle thread tension. Loosen the tension if fabric puckers as you sew. Tighten the tension if the thread forms loops on the seam.
Shorten the stitch length if fabric puckers, as per the user manual.
Clean lint from the feed teeth with the lint brush that Husqvarna supplied with your machine. Make sure the teeth are in the raised position, as per the user manual.