ISY994i Flashing Memory & Error LEDs

[Mick]

No network changes in several months, but suddenly the ISY is flashing two LEDS and not accessible via network.  I assumed PLM so have just rec'd and replaced the new PLM 24135 rev 2.4 8318 from Amazon.  Both off unplugged.  Plug in PLM, wait 30 sec, connect port A and power on ISY.  No joy, no change!  What are the next troubleshooting steps ?  

[rccoleman]

That indicates an Ethernet connectivity problem, not a PLM issue.  Some useful steps here: https://wiki.universal-devices.com/index.php?title=Main_Page#Front_Panel_LEDs.2FLights

[Brian H]

After finding the Ethernet issue.

If you use the new PLM . There is a procedure to replace the old one with the replacement.

https://wiki.universal-devices.com/index.php?title=ISY-99i/ISY-26_INSTEON:File_Menu#Replace_Modem_.28PLM.29

[Mick]

• Resolved.  It was a network issue.  A network switch in wiring closet feeding ISY became unpowered.  All is well with old PLM.   Thanks for the replies.