As you indicate WLC 2112 and ver 22.214.171.124.This seems to be the WLC bootloader version.Your WLC will probably have a version of 5.1 or higher (as these are the available versions on Cisco download site for the WLC 2112 model).
Whats the DHCP server in your setup and how have you configured option 43 on your DHCP server.
From one of the links provided earlier ,you will have some examples of dhcp config for Windows DHCP server/IOS DHCP Server/Linux DHCP server.
As example, from the links for DHCP on IOS: ip dhcp pool network default-router dns-server option 43 hex
For the hexadecimal string in Option 43,this is obtained from: Type + Length + Value
"Type" is always the sub-option code 0xf1. "Length" is the number of controller management IP addresses times 4 in hex. "Value" is the IP address of the controller listed sequentially in hex.
For example, suppose that there are two controllers with management interface IP addresses, 10.126.126.2 and 10.127.127.2. The type is 0xf1. The length is 2 * 4 = 8 = 0x08. The IP addresses translate to 0a7e7e02 (10.126.126.2) and 0a7f7f02 (10.127.127.2). Assembling the string then yields f1080a7e7e020a7f7f02.
The IOS command then added to the DHCP scope is: option 43 hex f1080a7e7e020a7f7f02
If issues still exist following config check, then you can troubleshoot this by investigating on logs:
From WLC cli, save logging to txt output: debug mac addr debug capwap event enable debug capwap error enable debug dtls all enable debug pm pki enable debug disable-all (to disable debugs after problem replication)
Simultaneously when logging above output, you can also log AP console output. On AP console: debug capwap console cli debug capwap client event debug capwap client error debug dtls client event undebug all (to disable debugs after problem replication)
Capture the WLC/AP debug output for some minutes until you see the image download loops from AP console.
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