@Davieboy1 Powerline KIT need to work in the same power circuit or under the same power meter, they should work when on the same side of fuse box, for details please check related QAs here:...

@Lenny321 They are compatible but it is recommended to upgrade all powerline units to AV600 for the best performance of the new powerline KIT.

@Pushtheriver Hello, You could consider a AV600 which could work with your old powerline KIT like model TL-WPA4220 but make sure they all work in the same powerline circuit or under same power meter....

@Gojo Hello, The House Led is off means that powerline unit lost pair, please confirm that unit is the on the latest firmware: Firmware for PA4010:...

@Windom Hello, An undeveloped new feature was added in the firmware published 2021,Jan, so the firmware was removed, but that firmware does not affect performance of 4220 V4 in other aspects. If you...

@baldeagle AV600 / AV500 devices are compatible, so the new version PA4010 will work with WPA4220 as well. Please remove the factors that could affects the power line environment as the FAQ below,...