I have five Blue On/Off switches (VZM-30SN) and something causes them to crash regularly (3 occurrences today of between 2 and 8 crashes occurring one after another). When this happens, these and (from what I can see) all my other blue series devices (switches and dimmers) seem to also crash. (I have 10 Blue (zigbee) devices installed at this point.)
My issue is mainly that when this crash happens, the switch power is removed, even though the switches are in smart bulb mode. Could this be a bug in the firmware? @EricM_Inovelli, could a change be implemented in the firmware that would keep the switch in the on position when using smart Bulb mode, even when it crashes?
Driver Date: 2025-08-26
Firmware MT: 122F-0110-01100101
When the switches crash, they power off and then back on, followed by the LED bar cycling through its colors. The switches are all connected to neutral.
(The crash itself is a separate issue that I am looking to investigate with Hubitat, but if there would be value in discussing it here, I can open another topic for this.)
In addition to @Lance_Inovelli questions, what type of load is attached? There is a firmware update that solves a problem when connected to some bathroom fans, but Hubitat hasn’t posted it yet.
No new apps installed since a bit. I didn’t try disabling the device in Hubitat, but I just did disable one of the switches to see what happens when it crashes. Will report back on the impact, if any, next time it happens - thanks!
Unfortunately, I don’t know of a way to trigger manually…
The switches don’t have fans on them. One has 9 Zigbee LED Controllers, One has a single Zigbee LED Controller, two each have a window that turns transparent when power is applied and one has an inovelli fan controller. The dimmers (that also power off) have one or multiple lights on them.
I can confirm that disabling the switch in Hubitat doesn’t stop it from turning off when it crashes.
I have also found that when I start a pairing cycle in Hubitat, the switch will crash multiple times, and hence turn off, then on again. I now have a couple of devices that are connected to that switch that are causing me grief… I suspect because of the constant rebooting…. Would be really great if this could be resolved!
Update: Just started pairing on another hub and the switches reboot started, so it seems that it doesn’t matter if the pairing command comes from the hub it is connected to or another one… either makes it crash and hence reboot.
Thanks Lance - I have it paired with a C8-Pro, and it generally works great. The only issue is that when the switches crash, which happens at least once a day, the power is removed from the downstream devices. It wouldn’t be such an issue if the power remained to those devices during those events.
As for the crash itself, I suspect that it is caused by something in the Zigbee signal received by the switch since all my Inovelli Zigbee switches and the hub’s zigbee radio all crash at the same time. For that one, are you aware of a device that I could use to help identify any signal that would cause it to happen? I’d be wiling to make the investment necessary to help determine the root cause…
So… regardless of why it’s crashing, is it possible to make it so that when these on/off switch crash while in smart bulb mode, the load keeps getting power? Is this something that can be set via a firmware update, or is it a mechanical limitation (ie when power is cut, is there something that releases, so not an option…?)
(I am investigating the crashing and will log a separate post if needed…)
I can check with the engineer to see if that is possible. I think it is an NO (normally open) relay though so the default state is for it to be off (and it is reverting to that with the reboot).
I was hoping you could try the firmware update to see if that makes a difference, but Hubitat has not gotten back to me yet. I pinged them again today. Although it is meant to handle certain loads, that doesn’t necessarily mean it won’t help in this situation.
Thanks! I’ll give it a go when the firmware is available. I am very close to confirming that this one on/off switch is the culprit, and if a firmware update is the fix, it would be great! It has all but 2 of my new kitchen’s LED controllers’ power bricks connected to it which pulls a constant 15w (when all LEDs are off), so it cold be a similar situation than a fan maybe…?
Reno is not yet complete, but here’s what it looks like when they’re all powered on (some are behind me):
(That Lutron switch on the right of the picture, next to the currently problematic Blue on/off is a placeholder to be replaced by one of my new mmWave switches once it arrives… )
)