Your Cel-Fi RS2 may be experiencing a hardware error.
Hardware errors may be remedied by a reset. Your Coverage Unit may not display a flashing error code. You will likely only see the solid red power indicator on your Unit.
Try this…reset your Unit. Simply unplug your Unit for a few seconds and plug it back in.
If after restarting your Cel-Fi, your hardware issue remains you will need a warranty replacement from your point of sale.