There appears to be an error in the manual for V1.1 (section 25). It states that:
Basic Function/Power-on = Solid blue
Intercom/End all intercoms = Blue flashing
My 20S' LED is always flashing blue in normal operation. That said, I'd like to add my request to something that I've read elsewere on the forums. Please change the default state of the LED to continuous instead of flashing. The flashing light attracts attention but also from a user interface point of view... typically flashing lights indicate action/warning/attention, continuous lights indicate status/normal.