My Fashion Mate 7256 can be turned on, but when i connect the cord from the foot pedal to the machine, it beeps, then shows Error Code C3.Then nothing happens when I press the footpedal.Any advise?

SOURCE: my sewing machine singer 7256 giving me a problem causing my fabric underside stitches bird nesting and suddenly the bobbin case comes out from its place and thread strangles and stuck, Why?

try changing the needle-- Correct needle insertion is mandatory for proper use of your sewing machine.
Raise the needle bar to the highest point, then loosen the needle clamp screw to remove the old needle.
Place the new needle in the needle clamp with the flat side of the needle facing the back, (round needle, the groove in the needle should face away from the shaft).
Push the needle all the way up as far as it will go. Then tighten the needle clamp screw.
rethread the machine top & bobbin
make sure the thread has not come off the thread take up lever
also check the top thread tension
do you have a manual?