Troubleshooting Aruba AP 92 without controller

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http://serverfault.com – I have deployed 11 Aruba AP 92 without controller, selecting the correct boot mode at the beginning of the configuration process. The 11 AP were separately configured with IP address, SSID and channel selection. When I connect AP on the LAN, 3 of them are visible trough the lan but are not working on the radio interface, "11gn" led is solid red, SSID not visible and there is no radio signal... I use to deploy Cisco AP and I am fairly new to Aruba, any help would be appreciated. (HowTos)