Brian H

One thing to consider. The OLD PLM's six digit ID is in all the modules will not respond to the new PLM' six digit ID. I believe replace modem will go out and write all the needed changes in the modules being controlled.

I had to take the top off mine to get to the SD card. Mine didn't align up well with the slot and when I clicked it to remove it fell into the unit. 😀

With out an SD card it should be impossible to even use it as it is where all the module information and programming is stored. I believe the early versions of the ISY994i had it internally and you have to remove the top.

Sounds like the switch is locked up or failed. Flashing red led usually indicates a communication issue to another module. You can try a power cycle reset by turning the power to it off and back on. Depending on its revision. Pulling the set button out should kill the power to it and then pushing the set button into its normal position. Will restore power to it. Do NOT push it all the way in as that may cause a factory reset. The tact switches under the paddles have been known to fail. Long time ago Smarthome extended the warranty on them in the known production problem time period.

2476ST is a power line only module. A restore as mentioned may do it for you. Locally does the LED bar graph move up and down when the paddle is uses? A factory reset and restore sometimes helps, but depending on its revision. May not have an Air Gap switch used in a factory reset. There is a method for the old ones. I have it if you need it. The information is on the sticker on the front of it. You asked about last firmware version for the 2476ST. It is 5.3.4. Though if everything is OK now you may want to hold off on the upgrade for now.

Looks like they are a V1 version and 1.6 is the exact version.

If your power line only deices. Suddenly start getting poor. The Access Points maybe starting to fail. If they are any Revision2 models. They are using the early revision of the 2413 base PLM main board. With the same capacitor issues. We have seen in the older 2413S PLM. The revision 1 Access Points are on the older base controller with the separate RF daughter board and seem to work better over the long run.

The serial adapter kit for the EISY and a serial port PLM. Should be wired correctly to use a serial PLM on an EISY.

The earlier firmware did have a separate access program made for it. I don't have have exact version where the launcher did access the later firmware in an ISY994i The latest firmware for an ISY994i is 5.3.4

NO. The 2414U or 2414S are not a PLM. The 2412U 2412S 2413S and 2413U. Are the PLM models. They are the original PLC Power Line Controller. That we could compose programs and download into them to run alone. Using the SALAD assembler we got in the original Developers Group. Use a completely different set of commands and will not work where a PLM is needed. Also if you are using a 2412S make sure only three wires are in the cable are being used. The 2412S has unregulated +12VDC on one of the pins. Normally are around 18VDC to about 19.5VDC

The 2450 I/OLinc is power line only communications. You may have some new power line issues. Like a signal sucker or power line noise maker. The trouble shooting link information may give some insight on what the problem maybe. It is also possible it has failed. As it has a switching power supply and the same capacitor issues we see in the 2413 PLM. I have seen different capacitors Smarthome tried to help but can't say exactly what yours may have,

The replace function would work if the replacement is a similar model. To do it you add the replacement with a new name. Then high lite the old one and pick the replace with function. Using the name you gave the new module. If it is a new power line only. It could take eight messages and acknowledgement to add one link to the replacement. So it would take awhile and if you have a power line noise issue. It may fail. If the new one is dual band replace may or my not be an option. As it may not be close enough for a swap.

Is it dual band or the power line only keypad?

One other fact. There is going to be an eisy price increase in early May. https://www.universal-devices.com/price-increase/

Try power cycling one of the switches. You can pull out the Set button to turn off the switch power then push it in to its normal position. Do NOT go past the normal position or you may factory reset it. You may also go into the Administrative Console and see how many links are in it and the PLM. That may give you a clue. Restoring one of the problem switches and testing may also show something.