Hello   @Pleasehelpme123 

Thank  you for reaching out to us, the powerline led may go off due to weak power line signal. here are some tips that you could try. 

1. Try to repair manually: please  put 2 powerline unit in the wall sockets, in the same room, and pair them again :
Paring Note:  press Pair button only for 1 sec, Power Leds should be flashing on both powerline units in pairing process. ( if the Power Led does not blink, press it for 1 sec again)
When the Powerline Led or House Leds are on, the pairing process is done

FAQ: How to secure (pair) the Powerline Network?
-  Connect main powerline unit to router via Ethernet cable, and put powerline extender in another room 

2.Put the extender powerline closer to the main

3. Try a different wall outlet for the powerline extender

Can you check the model of the extender unit, it is TL-WPA4220, may i know when did you purchase the powerline kit and was the powerline extender work fine before in the same location?