I don’t think we are trying to dim it. Just on/off
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My whispergreen fans are actually very easy to disassemble. All the wiring from the fan to the junction box goes through one or two internal plugs, and then it’s like 2 or 3 screws and the entire body of the fan comes out, leaving the housing in the ceiling.
There are plenty of reasons to not want to pull your working fan apart, but with this one it may actually be easier than you think.
If you can swap a switch, then you can probably also install a relay inside the switch box behind the existing switch (assuming there’s room).
@signbit Which modules (if any) do you have in your WhisperGreen fan? (Humidity sensor, Motion Sensor, Multi-speed module). As I detailed over on the Panasonic thread, the wiring on these can get quite complicated.
If I can find the time I can try hooking up one of my Zephyr switches to one of my WhisperGreen Selects and see if I can reproduce your issue.
Ah, but there isn’t room behind a 2-in-1 switch 
I don’t have any modules, since I am planning to automate it using Home Assistant; I already have a temperature/humidity sensor in the bathroom, and the 80 CFM setting is quiet enough and effective enough to not need to spend a lot of time/money/smarts on finetuning it even further.
That would be helpful - thank you!
Hooking it up was easy; turns out it was already done and I’d just forgotten 
.
I was unable to reproduce any problems. My fan is a FV-0511VKS2, which is exactly the same as your FV-0511VK2 but with a dual-speed module pre-installed. I tested both with and without the dual-speed module installed, and it worked exactly the way a dumb switch would have worked in the same position. I tried turning on and off multiple times, with a combination of the air gap and regular switches, and no matter what I’d done previously, the fan came on about 10 seconds after I turned the switch back on.
I never changed any of the config settings from the factory default, so it was still on exhaust fan mode.
I’ve now installed three of these WhisperGreen Select fans in my house, all with slightly different configurations of modules and all with as many smart integrations as I could come up with. One notable thing about these fans is that they’re subtle. I’ve had multiple occasions where I thought it wasn’t working, but it was actually working exactly the way it was supposed to. I’d definitely recommend you take the cover off so you can see the fan blades spinning, because sometimes that’s the only way to tell if the fan is on!
My recommendation would be to try the fan switch again, wired up to the same terminals you have the 2-1 switch currently working in, and make really really sure it’s configured for exhaust fan mode. Although to be honest I’m kind of questioning the value of the fan switch product for exhaust fans. It seems like the 2-1 in full sine wave mode, with the hard relay, would do all the same things, plus power monitoring.
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It can’t do it safely because all power is still going through the dimming circuits even in full sine wave mode. That’s why it’s not rated for that use case.
This is a feature I had asked about on the Blue 2-1’s for my shower light. I have it set now as an auto-off for 30 minutes, figuring that is enough time to shower and take care of whatever else and then the light is off just after leaving the bathroom. The switch is visible while in the shower (through the glass) and the timer (like an hourglass) would be awesome.
I just installed one of my Zephyr switches on my WhisperChoice fan and I’m seeing a weird behavior. It’s set up as single pole on/off and from within HA, everything is fine. It turns on and off with no issues. Manually from the switch, it turns on, then if I go to turn it off it turns off, the led turns off, then light blue and then to white (my default) and then back on. The only way to turn it off and keep it off is through HA. Any thoughts on this one?
edit
I tried a factory reset and also removing and readding the switch with no luck. Since I had a few more laying around, I decided to try another Zephyr switch right out of the box and it’s working just fine. Maybe I have a defective switch?
My fans are set at 80 CFM and 120 CFM and they are definitely audible when on. Also, they have no other custom modules, so nothing out of the ordinary should occur. They behave very simply when on the plain standard switches.
I have tried… and tried, like I said with two different switches and two different fans. I am glad this was corroborated by @efaden .
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Potentially. Monitor for now and try suspected bad switch in a new location.
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That sounds really frustrating; I’m sorry. I’ll keep playing around with mine this week and see if I can get it to misbehave. If I can, that might help shed some light on the issue you’re having.
Here’s the official policy: Warranty, Returns & Price Match – Inovelli
But honestly, I’ve always been very liberal with returns, exchanges etc as long as I don’t get the vibe someone’s trying to scam us.
Also, in the case where we launch a new product and inevitably someone finds an issue we didn’t (such as this case), I throw out the policy and just work with you to either fix the issue or refund you, regardless of the timeline (in other words, don’t worry about the 45 days or whatever it is).
In your specific case, we purchased the fan and are shipping it to China for analysis. I don’t have a TBD on if/when they’ll get it and/or if they can even fix it, but I can tell you were working on it as it does seem to be a popular fan model.
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Thank you - that’s all I need to hear. I’ll keep those switches on the shelf until the engineers figure out what’s going on, or we decide that for this particular use case Reds 2-in-1 work well enough. (Against @rohan 's advice I have installed three reds to service the WhisperGreens and as soon as something unexpected happens I’ll let you all know. I am hoping the worst thing that can possibly happen is to damage the switches since they are 1/3rd the cost of the fans - I am ardently hoping this is one of those “This will never work in theory” cases, since I like the fact that the fan LED strip matches the other red switches in the cluster; the Zephyr LEDs are distinct enough from the reds and the blues to be just annoying.)
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Any reason why the firmware are different on these two? Both were bought and updated at the same time and both show no new updates
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I am using hubitat and the “LED color when Off” parameter (96) is not working right. All of the colors are off by one.
Example: If I set it to Teal, it displays as Green. If I set it to Cyan it displays as Teal, and so on.
It seems to be working correctly for me. What version of firmware and driver are you running? Look under “State Variables” for “driverDate”, “fwDate”, and “fwVersion”
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- fwDate : 20230824
- driverDate : 2023-10-14
- fwVersion : 1.04
I’m seeing the same behavior on 2 different switches, with the same firmware/driver.
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I suspect I’m doing something wrong but I can’t get the LoadLevelIndicatorTimeout setting to work. The LED displays the fan speed when on and doesn’t go back to the dim default (off) look no matter what I change the timeout to. Anyone have any suggestions?
Power Monitoring - switch should measure the power consumption(not possible as there is no space on the PCB)
Welp, I should have kept up on the changes. I use those power monitoring readings to run my automations. It’s an algorithm based on solar intake and current power usage and then on off hours consume only excess and shutdown non essentials. I was going to use those readings to lower the fan rate rather than just shut it off. Bought in May, update came out in July. Kicking myself in December for not being able to work on this project until now. 
Any update on the LED light topic? Was the manufacturer able to provide an update on how they plan to bring the colors closer together?
This is definitely a “nice to have” update. Though, I would better classify it as a fix to increase the “wife approval factor”
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Same here and tech support was not able to resolve or explain. I returned the switches.