Deploying additional Unleashed member APs is simply a matter of connecting them via Ethernet to the same Layer 2 network and providing power. They will discover the Unleashed Master and join automatically. No additional steps are necessary.
To add additional AP you need to get the AP with the same firmware version, also needed to be on the same network.
Please check the firmware version of the unleashed ?
After this step please try to log in to the new unleashed network and make sure both the firmware versions matches in order to join the unleashed master AP.
Here is the short guide on performing factory reset.
The second AP that joins an Unleashed network will automatically assume the role of Standby Master. Thereafter, if the original Master AP goes offline, the Standby Master will become the Master and assume control of the Unleashed network.
Please make sure that the cables from your local router and ICX-7150-C12P are connected correctly :
Please follow the below guide for common setup of Lennar home user
Most common Setups for Lennar homes users
Ruckus Unleashed Set-up using your Mobile
Please use the below link for adding additional AP
Lennar Home Community