Techman

Neutral wire is required to provide power to the module. One other option may be the Insteon 2 wire dimmer switch. However it only works with incandecent bulbs or a mixture of led and incandecent.

UD no longer sells the 500 board. It's possible that a forum member may have one to sell. Not sure if you can downgrade the ISY firmware without creating issues. Maybe a forum member may have the answer. Hopefully you have current Zwave and ISY backups made prior to udating to 5,3,4

Remove power from the ISY, then remove the SD Card and clean its contacts with a soft eraser. The contacts can oxidize over time and create issues.

Do you have the 300 or 500 series Zwave board in your ISY? The 300 series board is not supported by 5.3.4 firmware. What firmware version were you running prior to updating to 5.3.4?

The EZCOMM / SMARTENIT PLM is comparable to the Insteon 2412S PLM. The PLM was made in 2012 so its firmware is outdated. You'll need the Insteon serial cable as the pin out is different from the stock serial cables.

Do you have an EISY controller. The PLM you have is compatible with the EISY. To link an Insteon device to the EISY you should enter its address xx.xx.xx in the Link Management tab.

What model PLM did you purchase from Insteon. What controller do you have? The X10 protocol is supported by the PLM and EISY. Being that you have some Insteon switches, then you've come to the right place.

@scholarwarrior' Apparently all your devices use the X10 protocol and are not Insteon compatible. Being that you don't want to replace them with Insteon devices then this is probably not the correct forum, as this is site supports Insteon, Z-wave, Zigbee, and Matter protocols. The current, and ony, controller offered by Universal Devices is the EISY. You should probably return the Insteon PLM unless you've already purchased an EISY. UD Store - Universal Devices I think the EISY is more than you need if you're staying with X10 All of the X10 devices and controllers can be found at this link. X10 PRO – X10.COM

@smorgasbord Attached is an updated set of instructions for replacing the PLM on an EISY/POLISY Personally, I prefer the USB PLM as there's one less thing to fail. It's also easier to locate the PLM away from the controller using a USB cable. Replace PLM Procedure (EISY or POLISY).pdf

The original instructions were written before the eisy/polisy was released. Any reference to the ISY should be replaced with EISY/Polisy. I'll update the instructions to eliminate any reference to the old ISY.

Insteon was launched in 2005, are you sure about the date of your insteon devices. If they're older devices then they're powerline only and don't have the dual band technology (powerline and RF) What is the date code and model number of your PLM, The information is on the PLM sticker You mention that your eisy firmware is 5.84, what is your UI version. You can find that by clicking on Help | About on the admin console. I think you should forget about X10. It's an outdated technology. Insteon is far superior. Prior to moving over to the EISY what were you using to control your Insteon devices.

@CraigB1 One thing you can try is removing power from the ISY for about 30 seconds.

I would hold off doing anything for a week or two. There's a firmware update that should be coming out fairly soon that may resolve your issue.

I've used the Insteon motion sensors outdoor for many years without problems. I have them mounted under eves so they don't get directly exposed to rain. If you have Zwave then ther are waterproof outdor Zwave motion sensors available from Zooz

Take a look at this article. If you have any Insteon Motion Sensors they are notorious for causing all on events when their batteries are low. All on events won't show up in your event log. https://wiki.universal-devices.com/INSTEON_Random_All_On_Events