When a 3-way lighting setup allows you to turn the light on and off from only one location while the second switch appears completely dead or does nothing, it points to a broken or disconnected traveler wire. If either of the two traveler wires running between the switch boxes comes loose from its brass terminal screw or breaks inside the wall cable, the circuit loses the alternate pathway required for dual control, reducing the system to a dysfunctional state. You can troubleshoot wiring continuity safely by isolating power at the circuit breaker. You can verify that your corrective action is successful when removing the wall plates, inspecting both switch boxes, and securing any loose traveler wire back onto its proper brass terminal restores seamless multi-location control from both switches.
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