Posted December 10, 20186 yr 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 ? IMG_1520.m4v Edited December 10, 20186 yr by Mick
December 11, 20186 yr 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
December 11, 20186 yr 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 Edited December 11, 20186 yr by Brian H
December 11, 20186 yr Author 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.
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