The power line lights on my PA9were green on both adaptors. One cabled to the router and the other plugged in upstairs and connected to my PlayStation. It works well.
I now have bought a WPA 4220 to extend the wireless network in a different part of the house.
I paired it to the 9020 on the same electric circuit but now the Powerline light is red on both 9020 adaptors.
But green on the 4220 but it has not joined the network but has its own TP network.
What have I done wrong please?