What do the different LEDs on the HomePlug adapter mean? EG4xxx and EG30xx meters can function with a wide variety of HomePlug AV compliant powerline communication adapters. Some officially supported adapters and their LED keys are shown below. TRENDnet HomePlug AV (TPL-406E2K) LED Function Typical Behavior Other Behavior POWER Indicates the adapter has power Green light No LED - no communication for too long or not receiving power ETHERNET Indicates an Ethernet line connection On -  live Ethernet line connectedBlinking - sending/receiving Ethernet data Off - may indicate an issue with network connectivity or a damaged Ethernet cable DATA Indicates presence of powerline communication On - Powerline device connectedBlinking - sending/receiving powerline data Off - no connection to any HomePlug devices TP-Link HomePlug AV (TL-PA2010) LED Function Typical Behavior Other Behavior Indicates the adapter has power Green light No LED - no Ethernet communication for too long or not receiving power Indicates a connection with the eGauge or another HomePlug AV adapter Blinking green when communicating with the eGauge Off - no connection to any HomePlug AV devices Indicates an Ethernet line connection Blinking green light when transmitting data Off - may indicate an issue with network connectivity or a damaged Ethernet cable Actiontec HomePlug AV (PWR500/PWR200) LED Function Typical Behavior Other Behavior PWR Indicates the adapter has power Green light No LED - no Ethernet communication for too long or not receiving power LK Indicates a connection with the eGauge or another HomePlug AV adapter Blinking red light when communicating with the eGauge Blinking orange or green - possible connection with another HomePlug AV deviceOff - no connection to any HomePlug AV devices ETH Indicates an Ethernet line connection Blinking green light when transmitting data Off - may indicate an issue with network connectivity or a damaged Ethernet cable HomePlug 1.0 HPE100T LED Function Typical Behavior Power Adapter has power and is connected to the eGauge or another HomePlug 1.0 device Green light when active, blinking green light when transmitting data Off - adapter is not receiving power, or cannot communicate to the eGauge Link Indicates an Ethernet line connection Green when active, blinking green when transmitting data Off - issue with network connectivity or a damaged Ethernet cable NOTE: Other HomePlug adapters from different manufacturers may work. However, since they have not been tested by eGauge we cannot guarantee full functionality. Troubleshooting and support may be limited in these situations. HomePlug 1.0 adapters are no longer available directly through eGauge - please see our article on locating replacement HomePlug 1.0 adapters for more information.