On the front panel of the ZHC are three LED lights. These lights display the current configuration of the ZHC and the power status.
The red LED is labeled with the letter "M" which stands for Main mode. The amber LED is labeled with the letter "S" which stands for Satellite mode. The green LED is labeled with the letter "P" which stands for Power which is illuminated when power is applied to the unit and despite which mode the unit is in.
For more information on the LEDS and modes of operation please refer to the article "ZHC Front Panel LEDS & Mode of Operation".
If the green LED is blinking, it indicates that there is a fault in the internal power rail and that you should contact Z-Band for further assistance.