A fast blinking red light on the Jaguar indicates that it is running in reverse at less than full power. This means that it is receiving a PWM signal that is less than the maximum value (in the negative direction).
When the light goes solid what color is it? A solid yellow light indicates that the Jaguar is receiving a neutral PWM signal. A solid red light indicates full-speed reverse. If the motor runs when the Jaguar is flashing red, but not when it is solid red there are two possibilities. The first possibility is that the motor is drawing too much current and tripping the breaker, you should be able to hear a clicking sound if this is the case. The other possibility is a hardware failure in the Jaguar.
Just to make sure, the Jaguar is connected to a 40A breaker on the Power Distribution Board right?
Ok, it looks like you posted your code while I was writing my post. If that code causes the Jaguar to have a flashing red light I recommend you calibrate the Jaguar using the procedure in the
Getting Started Guide
EDIT: Code was posted while I was writing