Did you try to reset them to factory defaults and repair them? To contact TP-LINK support directly, you can submit a ticket here. http://ticket.tp-link.com/index.php?/Tickets/Submit

Chris, I didn't see such a feature in PS110U's user guide.

This article may help you to make a correct decision based on your ISP bandwidth. http://www.tp-link.com/en/article/?faqid=461

You got a WPA4220KIT, right? Did you pair them? http://www.tp-link.com/en/article/?faqid=258 To login its web interface and change security settings of the network, follow this. 1. Connect WPA4220 to...

You got a WPA4220KIT, right? Did you pair them? To login its web interface and change security settings of the network, follow this. 1. Connect WPA4220 to your PC by a network cable. 2. Down and run...

Different powerline adapters under different electrical meters should not be able to communicate with each other, so I'm confused about how does it happen as well...