On a three-way, there’s an additional terminal, called the “prevalent.” Power comes in to the switch to the frequent, then two “traveler” wires link the primary switch to the 2nd within the brass terminals. Being about the safe facet, check the switch to verify it no more turns the light https://sethtzyzq.verybigblog.com/33931163/considerations-to-know-about-smart-power-points-and-switches