Here is a picture of my slide controller when the cable came unplugged from my motor during the shakedown cruise. The code sequence is the number of red flashes between green flashes.
Not sure if you have the same model controller and the error codes are different between the models.
I recommend getting a mechanics articulated mirror so you can see and read the code. Or wait until dark and then you should be able to count the flashes in the dark compartment.