When a 3-way light switch system works only intermittently or requires you to flip both switches into specific synchronized positions to get the light to turn on, it indicates a wiring error or a failing switch component. This erratic behavior is typically caused by a loose traveler wire connection on a brass terminal screw, a swapped common and traveler wire during installation, or internal contact pitting inside an aging switch. 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, removing the wall plates, correcting misplaced wires, and tightening all terminal screws ensures the light turns on and off reliably from either location every single time.
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