My Innovis 4000D sometimes has a similar problem--the red light would come on and off, and it wouldn't sew when the red light was on. My dealer gave me a new foot pedal, and it was fine for a while, but then started again. I found the solution on this board. Every time it's a problem I extend the foot pedal cord as far out as it will go and I vacuum in the opening. That solves it for at least several months. Somehow lint/dust gets in and messes things up.