Hi there,

I am installing an HS 210 in a 3-way circuit. one junction box does not have natural wire, so I can only install one HS210 in the other junction box.

however, after I connected all wires, the light keeps on (I know I didn't connect the neutral wire yet cause I want to test if the circuit is going to work properly and then connect it and the app)

does anyone how to resolve this? 

P.S. if I switch the red wire and black wire, the light/switch keeps blinking/turning on and off