ZyXEL Communications Computer Accessories Powerline Ethernet Adapter Series Manuale Utente

Chapter 7 LEDs and Troubleshooting

PLA-4xx Series User’s Guide

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• Inspect the LEDs on your PLA-4xx and make sure that the ETHERNET and HomePlug 

LEDs are on or blinking. See 

 for troubleshooting LED related 

problems.

• Check all ZyxEL HomePlug AV devices on your network have the latest firmware 

installed. The latest utility cannot communicate with PLA-4xxs using earlier versions of 
the firmware. Go to 

 for instructions on installing the latest 

firmware.

• Check you are using the latest version utility. Earlier version utilities cannot communicate 

with PLA-4xxs using the latest firmware. If you do not have the latest utility, download it 
from the ZyXEL website.

• If the device is not a ZyXEL device, then the DAK and Network Name will be greyed out.
• If you are running another tool such as the Firmware Detection Tool or Firmware 

Upgrade Tool, the Utility will not detect your local device.

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1 Your powerline adapters may be connected to electrical surge protectors. Connect them 

to standard power outlets.

2 Your powerline adapters may be located close to large appliances such as refrigerators or 

air-conditioners that cause interference with the powerline signal. Move the adapters 
further away from such appliances to reduce interference. 

3 Your powerline adapters may be placed close to electrical devices such as electrical 

insect-killers which produce radio waves. These may interfere with the powerline 
signals. Move the adapters further away from such electrical devices.

4 Your wiring may be old and/or low quality or with a long wiring path. 

This section applies only to PLA-4xxs with the ENCRYPT button.

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Your device has already connected to another powerline device. Press the ENCRYPT button 
for more than 10 seconds to release the connection.