Danfoss Zigbee repeater is designed to extend the wireless range from the Danfoss Ally Gateway to the Danfoss Ally Radiator Thermostats or Danfoss Icon Zigbee module. If the Danfoss Zigbee repeater is placed in a location where it is not active – meaning none of the devices are communicating through the repeater then the LED will start flashing to indicate it is not being used. Try moving the repeater to a different location.