Inovelli LZW31-SN not including or excluding

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1

TL:DR at the end

I've had this dimmer for a couple of years, worked fine until about a month ago. Not a light that is needed urgently so I put it off until this week and I'm stuck trying to get it working again.

One day I realized that light hadn't turned on in a couple of days but at the time I thought it was more to do with a presence sensor automation that has never been as reliable as I'd like so I let it be. That other issue usually clears itself after a day of activity. Few days later I am once again realizing the light still hasn't turned on. Now I go check the dimmer and notice that the status LED is off. Other stuff came up so it was another week or two before I got around to digging into it.

I tried holding the configure button for >20 seconds, no activity. Tried pressing the config button 8x, no activity. I went and reset the breaker for that circuit, gave it a good 20 seconds being off for good measure. When the circuit was powered the switch lit up again. Progress!

I then tested the paddles and they turned the light on and off. Next I tried to control the switch from the hub but it would not respond to any commands and wasn't showing as recently checked in. On to reset. I went into the hub and removed the device from any automations / rules and then delete it from the device. The hub tried to exclude the device so I pressed the config button 3 times. The led on the switch was blinking blue, then flashing red and the hub eventually gave up on trying and gave me the option to 'Force Exclude' which I took.

In the hub I no longer see any reference to the original device so I tried adding a new device. I tap on that, then Z-Wave and finally Start Z-Wave Inclusion. With that timer running I pressed the config button 3x, LED blinked blue then flash red. Tried another Exclusion but that also doesn't do anything.

So now I'm stuck here. I could try resetting the breaker again or redoing the wiring to the switch but it seems to be responding to physical input OK and the LED is flashing how it should given button presses. It could be the radio but if it's damaged I don't think a power reset would help. Oh also if I hold the config button to reset the switch it does switch to green for a bit which if I remember correctly is Z Wave 'strength' indicator so maybe the radio is working after all?

One last thing I tried as a Hail Mary was updating the LZW31-SN driver code in Hubitat, the version I had was from 2020 so it was worth a shot but didn't help at all for this issue.

TL:DR

LZW31-SN shut off / inop
Reset restored physical control but not remote control
Removed device from rules / automations and then from Hubitat
Hub could not exclude device during removal. Forced Exclusion
Reset device
Put device in discover mode
Hub will not discover device during Inclusion
Put device in discover mode
Hub will not discover device during Exclusion

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Have you checked Logs while any of this is happening to see if there are any clues there? If you see something unusual from the hub, like a Z-Wave "busy" warning, you may want to fully shut down and restart the Z-Wave radio, which a regular hub reboot won't do. To do this, shut down the hub from Settings > Shut Down, then remove power (most people recommend unplugging from the wall side to avoid agitating the micro-USB connector on the hub) for at least 30 seconds, then reconnect to restart everything. Then, try again after a few minutes.

Particularly after a failed inclusion, I'd try an exclusion first, though it's suspicious that this wasn't doing anything for you either. I guess one thing you could try is seeing if Smart Start gives you better luck than traditional/classic inclusion, but at least with classic inclusion you can choose to skip security if you want to...

Power cycling the dimmer can't hurt, though I'm not sure it's ever helped me with any of these; FWIW, if wired correctly, pulling the air gap should also power down the device without needing to mess with the breaker.

PS - The driver shouldn't affect whether a device includes (or excludes) or not, though it can't hurt, and I know that was a last act of desperation, anyway!

PPS - Does anyone remember if disabling remote control (not sure if that's actually a thing you did or if you just meant that it wasn't working?) on these inadvertently also disables Z-Wave network operations like this? I can't remember what device I read this about, or even what protocol it involved...

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IIRC disabling remote is equivalent too saying ignore ZWave requests. Option on the driver reads:

Disable Remote Control

Disable ability to control switch from inside Hubitat

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For sure, but what I was wondering is whether that extended to the exclusion process.

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Shouldn't, but...

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I checked the logs but didn't see anything regarding the radio being 'busy' or any other Z-Wave errors. I've created a gist of the logs starting from when I last tried to control the device through the app.

I haven't tried Smart Start but I'll give it a whirl. Edit: Scratch that, I have a C-5 hub that apparently doesn't support Smart Start.

For the remote control part - I didn't disable remote control but rather, as you said, just meant that I wasn't able to control the switch through the Hubitat app / interface.

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