HS210 switch turning on and quicly off

I bought and installed tp=link smart plugs and a HS200 switch with no issues. I then bought a HS210 set. When I checked I only had a common (White) lead in one of the two boxes, so I just wired one HS210 switch and it works perfectly. (Ijust mad sure after programming the switch I said finished to the other questions in Kasa). When I tried to wire the second switch into a different 3 way switch system in my home, as in the first case, only one box had a common wire so I put the switch in the box with a common wire checking all the connections. When I turned on the breaker the light attached to the switch blinks on and off and the switch clicks. This starts a second after the power to the line is turned on. Any ideas? I've double checked the wiring between the two switches and it seems to be OK.
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@Joe43 I had the same problem. I connected the neutral wire on the first light switch and it worked. On the second light switch, I forgot to connect the neutral and it shut on and off with a clicking noise once I turned the breakers back on. I went back and connected the neutral wire to the 2nd light switch and it fixed the problem.
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Could be a defective switch but 99% of the time if a switch restarts when you turn it on (and the load side drops out) it's wiring. Usually it's that you haven't connected the neutral properly or the wiring is "power through fixture". Might be a good idea to consult an electrician.
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From the current situation, it seems that something went wrong about the physical installation.
Instruction as below: https://www.tp-link.com/us/download/HS210-KIT.html#video https://www.tp-link.com/us/faq-2009.html
Furthermore, you can post a picture of the physical connection of the 2nd unit to do further analysis.
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I got the same problem the light would flicker on for a second and turn off your could hear the click on the switche but my light are connect to a receptacle with I have a light fixture connected. Any solution??
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Please refer to the setup video and FAQ to double-check the wiring, you can send us the picture of the wiring or get some help from an electrician.
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I wired my HS200 switch tonight.
Two blacks to my old switch, a bundle of whites in the back, and ground to the old switch.
At first install, I could not get the orange light to light up...tried refreshing/resetting. No luck.
Took switch off wall, switched the two black wires...did nothing else.
Worked.
But I had to flip the power off again to push things back in. Did that.
Power back on, and the switch just clicks continually. No idea why.
Any ideas?
I put the old switch back and it works fine.
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@Joe43 I had the same problem. I connected the neutral wire on the first light switch and it worked. On the second light switch, I forgot to connect the neutral and it shut on and off with a clicking noise once I turned the breakers back on. I went back and connected the neutral wire to the 2nd light switch and it fixed the problem.
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