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Some limit reached of FGS 223





iam jus trying to attach FGS 223 to my existing elektro setup and have following problem:


 we have connected FGS 223 to control two branches of lights in "hallways setup" where the light are controlled by multiple switches (connected in parallel).
In fibaro they are marked as buttons (parametr 20 - option 1).
For first branch where lights are controlled by 5 switches the lights are working just fine. But for the other one where is 8 switches we were able to connect only 6 of them and when we try to connect last two the system stops registering signal from switches.
We tried to connect just blank cable first about 3 meters - the switch was still not working - then 1 meter and switch was working. Did we hit some limit? Is there lenght of wires limit? How can i resolve? 
Ive tried to have another FGS 223 (second one) for second branch but it didnt help the problem is the same.
Whole time the remote control of lights thru app works normally. Is there other module i should try which might help?
Please help 
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I would check for inductive voltage at the end of the wires. 

In theory what you are trying to achieve should be possible, but i do think i have seen anyone having 8 switches on the same light circuit.


My guess is that it's all about the cables used and the distance between the cables.



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