Montipora,
If the blue "W" is not lighted, it will likely mean that the RF module or wireless chip has come loose in your controller. To correct the issue, please follow the steps below:
1. Power down the controller
2. Remove the 3 screws from the back of the controller casing
3. Slide the knob off and separate the two halves of the controller
4. Carefully remove the RF module that is located in the top left corner of the driver board
5. Line up the pins and put the RF module back in place
6. Close the driver casing and power on the unit