Is the LED indicator of one of your CPL adapters red? Does your TV or Internet connection not work properly? Reset the CPL adapters.
Choose your PLC adapter. Does it have 1 or 3 LEDs?
Your device has 2 or 4 LEDs? It is not a PLC but a Wi-Fi Extender.
Reset your PLC adapters if the dLAN LED that looks like a house is no longer green.