3rd step of buttonhole doesn't work

If the buttonhole lever on your Husqvarna Viking Jade 20 sewing machine is not lowering enough to reach the buttonhole foot, it may be misaligned or not properly adjusted. Here are a few steps you can try to troubleshoot the issue:

1. Check the Buttonhole Foot: Ensure that the buttonhole foot is properly installed and in the correct position. If the foot is not positioned correctly, it may interfere with the buttonhole lever.
2. Check the Buttonhole Lever: Inspect the buttonhole lever for any damage or debris that may be causing it to get stuck or misaligned. Clean the lever and surrounding area with a soft, dry cloth.
3. Adjust the Buttonhole Lever: You may need to adjust the position of the buttonhole lever to ensure that it aligns with the buttonhole foot. Refer to your sewing machine's manual for instructions on how to adjust the buttonhole lever.
4. Contact a Professional: If you are still experiencing issues with the buttonhole lever, it may be best to contact a professional sewing machine repair technician who can diagnose and fix the issue.

It's possible that other users may have experienced a similar issue with the buttonhole lever on the Husqvarna Viking Jade 20 sewing machine. You may want to search online forums or communities dedicated to sewing and sewing machine repairs to see if there are any helpful tips or solutions.

Usually it is because someone made a button hole and it is in the 3rd step of the button hole (Step 1 goes forward, Step 2 bartacks the end and Step 3 goes backwards to finish the buttonhole)
Make sure that the machine isn't set on buttonhole and it should begin to sew forward again. Good Luck

Search the internet for web sites and videos that discuss buttonhole procedures.

How To Sew Button Hole Using Sewing Machine and Buttonhole Foot Tutorial

How to Sew One Step Buttonholes

Sewing buttonhole with the buttonhole foot So Sew Easy

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A manual would probably be helpful. This shows a manual for the Daisy 315, but it is probably close enough that it will help:

http://manuals.husqvarnaviking.com/

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Sounds like the sensor has gone bag or something is stuck in the socket (connector). Check that there is nothing stick in the socket/connector. If still not working, you will need to have it serviced by a Viking Service Tech. You can find a dealer near you by using the link 'Locate a Dealer' at the Husqvarna Viking Website - http://www.husqvarnaviking.com/us

the machine probably needs to be serviced to see why it's not making
a buttonhole and see if the gear or cam for the zig zag stitch is
worn or damaged.

the button hole will sew backswards first

You may be able to still get that manual, check with your dealer. If not you can call Viking at: 1-800-474-6437 if it's out of print for a photo copy of the original owners manual.

To make a buttonhole do the following:

1. Turn the selector dial to the top position, That is the first step of the buttonhole.
2. Turn the stitch length dial (the bottom dial) to the picture of the buttonhole, it's between the 0 and the 1 on the dial.
3 Put on the "C" foot and put the tension dial, (the small dial just above and to the right of the needle) on 4.
4. On a test fabric, sew about an inch or so and stop. Turn the selector dial down one click and sew the bar tack of the buttonhole. Just do a few passes, don't build up alot of stitches here.
5. Turn the dial down another click to the 3rd step, the right side of the buttonhole and sew until you reach the place where you started the left column of the buttonhole and stop.
6. Turn the dial UPWARD one click to the bar tack position again and do another bar tack like you did at the top of the buttonhole. Don't build up alot of stitches here, about three passes does the trick.
7 Remove the fabric from the machine and when you cut the threads, leave a tail about 2 inches or so of the thread. From the back side of the buttonhole, pull gently on the thread and a loop from the front thread will appear on the backside. Pull the front thread to the rear and tie off the threads and then cut them close to the knot you tied and the buttonhole will not come apart.

If you machine was recently serviced, the service tech might have reversed the motor connections. If not, it could be the zero feeding mechanism is stuck. Try dropping your feeddogs, i.e. like sewing on a button. Then raise your feeddogs to see if the problem clears. What happens when you sew a buttonhole using the automated buttonhole accessory? If these do not work, it may be your pc board which has a 5 year warranty if you are the original purchaser from an authorized Husqvarna Viking dealer. If resetting feeddogs does not clear the problem, Will probably need service by an authorized Husqvarna Viking dealer. If the service tech cannot repair, they can send to Husqvarna Viking Service Technician for repair. Visit the Husqvarna Viking website for a list of dealers closest to you. http://www.husqvarnaviking.com/us Good luck.

Put on the C foot. Select the buttonhole stitch. The machine will start sewing in the bottom left corner of the the buttonhole. Sew the length that you need, press and release the reverse button and sew the right side of the buttonhole. When you get back to the bottom, press and release the reverse button again and the buttonhole will be finished and the thread will tie off and the machine will stop. If the buttonhole is what you want, press and release the Stop button and the machine will repeat this buttonhole as many times as you need until the machine is turned off or the Stop is pressed again. When repeating, you need not press the reverse. Just press down on the foot control and continue until the machine stops by itself.
If you don't like the first one, just sew another one using the reverse button to set the ends.