The error message 251 can be displayed during the initialization cycle or your Daikin WLAN adapter (e.g. after a reboot or Firmware update). The initialization cycle should only take a few seconds, so please use the refresh button after a few seconds to update the status of your unit in the Daikin Online Controller application. The error message 251 should disappear automatically if no other errors are present on your unit.
If the error doesn’t disappear, please check your system for errors through the infrared controller.