@KCSmartLife 

If you end up using only one HS210 the app will respond odd. If you add the second HS210 that should correct it. If you want to keep the one HS210 you need to make sure the HS210 is installing on the live wire side or where the power is coming from, and the old switch need to remain on.

@Tony 

Tony wrote

@KCSmartLife 

 

If you end up using only one HS210 the app will respond odd. If you add the second HS210 that should correct it. If you want to keep the one HS210 you need to make sure the HS210 is installing on the live wire side or where the power is coming from, and the old switch need to remain on.

If this were true, then wouldn't the switch work correctly if the manual switch were on?  Or not work at all if it is off?

As is, I can use the app to turn the light on and off when the manual switch is in either position.  The only thing that does not work is the switch detecting if it is on or off.

I've read and understand all the pitfalls of using only one switch and how wiring incorrectly will behave, but it doesn't seem like I'm fitting into any of those categories.

What am I missing here?

@KCSmartLife 

I am having a similar issue. I have one of the hs-210 installed. I verified it is on the live end of the circuit. the physical switch itself works just fine to turn the light on and off. It also works well with the manual switches that are still in the circuit. However it is the app where I have to toggle it twice for the light to turn on or off.

@KCSmartLife I have the exact same problem. I have installed 6 other of these switches without issue but have the problem you describe on only one. Sorry Tony, but your response is not accurate......only one smartswitch is needed per group.

I hope someone solves this - driving me crazy!!!!!

@RudyH Ok, I don't have the solution, but I at least have more information.  What I've found is that the HS210 determines the state of the switch by difference in load b/w the traveler wires.  In long runs of traveler wires there can be some inductive pick-up from the live traveler to the "off" one.  tl;dr if you switches are too far apart it might be the problem.

I tried a treatlife switch (model SS01) and when I initially installed it, it did the same thing....  disappointing.  But I was too tired to take it out so I just left it in.  Then, one night when I was trying to show my wife that alexa would toggle the light when you told it to turn the light on and alexa wouldn't do it.  Suddenly it had started working.  I have no explanation.  Every so often it doesn't show the right state, but it has been working about 80-90% of the time.   I'm not sure if the HS210 would have "fixed" itself if I left it in or not.

The alternative solution is to install both switches, but even then if the traveler wire run is too long it still might be a problem for detecting switch state.  Hopefully, they can clean this up in the future.  Shouldn't be too hard to account for it or even to "train" your smart switch what "on" and "off" is when you install it so it can dial in the correct threshold for load.

Hope this helps!  I wish I could give a better answer, but this sorta works for me now so I'm gonna roll with it.  Treatlife has a new model of switch the SS02...  might work even better?  I got the SS01 because it matched the other switches in my house.

@KCSmartLife Thanks for the reply. I decided to try installing the HS210 on both switches just to see if it would work. It did!!!! I'm kinda pissed that I had to pay double (by buying two switches)  to get it to work........and still have no idea why the seven other instalations that I have using that same equipment works with only one. But no more expensive than it is I wished i'd known that was a possible solution before wasting hours trying to get it to work by switching it around, changing out the sister switch, etc. Oh, well.....all's well that ends well!