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The red light usually signifies that the machine is not ready to sew because some function has not been turn off or has not been activated, the machine is not threaded correctly, or a myriad of other explanations.
Remove the thread from the machine. ALWAYS RAISE the presser foot and rethread from the beginning. Verify the thread path is correct and the needle has been installed facing the correct direction.
open the top of the sewing machine. Then press the button or lever that changes the forward reverse mode. You may find that something got stuck there where it should effect the machine part. May a drop of oil on that spot can help?
Go to the singer website
Click on customer support--there will be a drop down menu
Choose instruction manual
In the box type the model number---4166
Click search
Faboulous machine the 401 and the best machine ever made, in the UK if I remember the two red wires go to the right hand pin and thw two blacks go to each terminal, when you rewire the plug which is fidly undo the stop motion, when you plug the machine in if it runs on without touching the foot control change the two black wires over, to rewire the foot control there are only two wires, you can't go wrong.
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