Brian H

Bright LED is only one symptom. It can still be bad with a bright LED. Best to do what you thought. Ticket so UDI can help you troubleshoot.

Did you power cycle the Eisy also? The PLM is most likely only checked for a boot up. Is the LED on the side of the PLM on at about its normally brightness? Sounds like the PLM has failed or is almost completely failed. How old is it? Sticker on the back should give you information.

Thank you for the update.

The SH10A is receive only and will not send an acknowledge back. You probably are seeing the PLM acknowledging the command. Since the PLM sends the command back to verify it was valid and sent.

The X10 commands require a short delay between commands. Like the address has to be sent and then a short (not much but don't have exactly known) time the bright or dim command. I am not a programing type so if the slight delay maybe needed. I can't say how to do it. That maybe but not for sure your problem. The ISY controller that worked maybe running slower than the eisy that doesn't work. With the short delay long enough with the ISY controller.

The small siren. Need the X10 address sent and then the bright or dim command. Did you send the address than a small pause to the dim or bright? Do you have any other X10 devices that are still OK? If others also stopped working then I would suspect something changed power line problems.

I saw your question on the X10 forum and I agreed. In my post there. Try moving the module to different places to see if you have a power line signal issue.

I have one of the early released Insteon Siren modules and I believe X10 was not supported.

5.3.4 was the last ISY994i firmware. If you have a Z wave card. Depending on which version you have. Series 300 or 500. 5.3.4 was only for series 500.

Yes it has failed. Power cycling and working again for a short time is one of the failure modes we see. If the eisy behaves like the older ISY994i. It will only check for a PLM at boot time. It may have to be rebooted to again check for a PLM. If it thinks it is not communicating.

I have also used similar devices to sense when a device is drawing current.

Does the eisy still have a Replace PLM function? When you install a replacement PLM and then reboot so the controller knows you have a new PLM. You had to use the Replace PLM function. To go out to all the modules and replace the old PLMs six digit ID with the replacement PLMs six digit id. If the replacement PLM sends commands with the new id to a module with the old PLMs id It will not respond.

I also found my 2440 original RemoteLinc. Would not link if close to the PLM. I had to put it into the linking mode located at the other end of the home. So the PLM had use a different Insteon dual band device using that devices RF.

Battery data from old Smarthome site. The part where I thought there was no protection board was incorrect. It did have a protection board on the battery. Battery.pdf

FCC Database: https://apps.fcc.gov/oetcf/eas/reports/GenericSearch.cfm Grantee SBP: Product Code: 23422 Details.