LZW30-SN won't pair with Home Assistant zwave JS

Product Support
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1

I’ve had a LZW30-SN switch for years that worked fine. Yesterday Home Assistant showed a firmware update for it that I tried to install but failed.

This resulted in the switch showing as dead in Home Assistant zwave JS, and now I’m stuck even trying to get it paired.

So far I’ve tried:

  1. Excluding the device
  2. Re-pairing the device by pressing the button three times
  3. Deleting the device from Home Assistant then pairing again
  4. Factory resetting the device by pressing the button for 20 seconds

Now I have a factory reset device, and it still won’t pair. I enter add device mode in HA, then press the config button three times. The light flashes, and HA immediately says it failed to add the device. There’s no useful errors showing in the log:

2026-03-26 06:26:33.764 CNTRLR Starting inclusion process with strategy Default…

2026-03-26 06:26:33.788 CNTRLR The controller is now ready to add nodes

2026-03-26 06:26:43.853 CNTRLR [Node 040] Timed out while waiting for a response from the node (ZW0201)

2026-03-26 06:26:45.197 CNTRLR [Node 015] Timed out while waiting for a response from the node (ZW0201)

2026-03-26 06:26:57.165 CNTRLR Adding the node failed

2026-03-26 06:26:57.169 CNTRLR stopping inclusion process…

2026-03-26 06:26:57.231 CNTRLR The inclusion process was stopped

2026-03-26 06:27:22.652 CNTRLR Adding the node failed

How do I get this device back and working again?

2

Strange that HA showed a firmware update available. The most recent beta firmware was released five years ago.

I’d try to do a manual Zwave exclusion before re-adding. You technically shouldn’t have to do that, but it’s worth a shot.

3

Thanks for the reply. I gave the zwave exclusion a shot somewhere before step 4 when I factory reset the device. The device was also deleted from Home Assistant.

Attempting to pair it pretty much immediately gives a failure message in HA. If I try testing the zwave strength on the switch (press and hold the config button until it shows green), I get a red light even though there’s another zwave device in the same room that has no problem talking to HA.

4

I just tried excluding it again. When I tap the config button three times, HA immediately shows “removing device”, but the switch just keeps blinking blue and then eventually shows a red LED.

I tried pulling the air gap then pairing again, and HA immediately shows an error saying it failed to pair and to check the logs (which have nothing useful).

5

Yeah, I’m pretty sure it will flash green when you successfully do a general exclude.

It’s weird that a firmware upgrade was suggested. Do you remember what version it was going to flash, and what the current version was? I’m wondering if it flashed an improper firmware and bricked it.

6

I don’t, unfortunately :frowning: I was hoping the HA logs would record what the version was, but all I see is the flash attempt, not any version info.

I too am worried it got bricked somehow. Any way to recover it?

7

Ok looking at my skipped updates (I skipped it after it failed), turns out the update was for a different switch from 1.35 to 1.57.

So… not related to flashing. But it’s still dead and not pairing :frowning:

8

When you did the factory reset, did you get the yellow and then eventually red? In other words, are you confident you got a good factory reset?

When you did the general exclusion, the flashing red, I THINK, indicates a failure. So if it won’t exclude, that may indicate the switch is damaged. Do the logs indicate anything regarding the general exclusion? It may just have failed.

Can’t help much with the HA side. Are you using ZHA or Z2M?