A three-way light switch system can stop working correctly due to several common electrical and mechanical faults. The most frequent cause is a loose terminal screw connection where a traveler wire or common wire has worked loose from its brass terminal under thermal expansion. Other causes include internal mechanical contact failure inside one of the switches due to long-term wear, or a broken wire conductor running through the wall between the two switch boxes. You can troubleshoot lighting faults safely by isolating power at the circuit breaker. You can verify that your corrective action is successful when shutting off power, inspecting terminal screws, tightening loose wires, and replacing a faulty switch restores flawless multi-location control.
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