So me and another person are experiencing an odd issue.
when we set parameter 8 to either previous state (and the power was off) or always off, once a power failure occurs when power is restored the light quickly flicker on then immediately off.
I noticed that with my 700 series zen76’s in my house (two separate ones) I don’t experience this phenomenon. if there is a power failure the lights remain in an off state if they were off prior to the power failure.
he also has this issue with his 800 series Zen76 any insight to this? has anyone else experienced this? or willing to test if they’re also having this issue? I thought maybe scene control being off would be a catalyst, but it’s the same regardless of if it’s on or off with the 800 series. my 700 series switches are a mixture of scene control being on and off and both don’t exhibit this behavior.
I’m on 10.30 for my 700 series switches and 3.50 for my 800 series switches.
Hi there, thanks for reaching out! In order to better assist, can you please let us know what hub you’re using with the switches?
Can you also please send a screenshot of how all of the advanced settings are currently programmed for the device?
Does the behavior occur if you exclude the switches from the hub and factory reset them (leaving them excluded)?
sorry, guess that would have been helpful. We’re both using home assistant (HA core 2025.2.3, HAOS 14.2 and Z-wave JS 15.0.3 for me). To be clear I wouldn’t ever know anything odd was happening with the switch unless I’m in the room when a power failure occurs. it works fine otherwise, it’s just that it flickers instant on/off if it was in an off state prior to the power outage.
Hi @Dtlokey, our techs attempted to replicate the issue and were not successful in re-recreating the reported issues. Please open a support ticket directly with our team for additional troubleshooting and same-day response time
Just to add to this - I have a ZEN76 fresh out of the box, joined to a z-box with no parameter changes, and when the power goes out and is restored, the light turns on for about 1/2 second and goes off again. Not sure if this is the exact same issue or not, but I haven’t seen this with other switches.
I then tried all possible settings of parameter 8 with no difference in behavior. (Except, of course the setting where it should be on after power fail, where it stayed on)
sounds pretty much exactly like my issue just different platform. I have a larger deployment of 800LR on/off switches at my father’s house, think I’m going to go over there and see if this is common with any of those in the coming days so I’ll report back.
The ‘issue’ is tied to our patented 3 and 4 way solution with existing mechanical switches. It is not tied to the firmware version of Z-Wave chip version on the ZEN76.
The reason I asked about single pole vs multi pole installation is because when you change the state of the load from the mechanical switch and perform power outage this behavior will not occur anymore. However, in single pole installation there is no way to do so.
We will be checking with factory engineers to see if we can address this ‘issue’, so it will be not visible for the end users and also do not affect our patented 3/4 way solution.
so at the moment it sounds there is no solution for the current hardware for the zen76? Would the zen71 also have this issue? is this also an issue for the Zen77 if the ramp rate is set to 0?
I personally don’t have many power fluctuations, but someone I’ve installed a couple of these for does have them more frequently in his area and he’s pretty sensitive to the flashes especially in the middle of the night as it wakes him and his spouse up. He’s noted it for some time now. I may suggest he swap for a Zen72.
Sorry, meant the Zen 71, thanks for the heads up! Hopefully they’ll be a solution that’s fixes this for our current switches in the future. Really appreciate the transparency and prompt responses!
So my initial thoughts regarding this “issue” being tied to 3/4 ways installations were confirmed by our engineering team.
When the power is off and restored again, if the relay is OFF, then the load is connected to sourcing power. and not controlled by the relay - this issue occurs
If the power is restored and the relay is ON, the issue will not occur.
In 3/4 ways installation the ‘dumb’ mechanical switch can be flipped, and this issue does not occur. In single pole installations, there is no workaround for this, and we would recommend using ZEN71 instead.
The ZEN77 is a triac dimmer and does not have a relay - so the issue does not exist there.
understood, though had I known this I would have purchased appropriately. I definitely think this should be disclosed as a site note for those planning to purchase in the future
