LINE is the power and LOAD goes to the light or other things controlled by the 3-ways. If the 3-way switches were not correctly wired, then you must be very careful to identify the LINE and LOAD wires BEFORE you disconnect the switches. It’s a good idea to replace both switches simultaneously as the other one could fail soon after. Please note the different color screw terminals. I usually take one wire off the old switch at a time and put it on the new switch, then repeat with the other wires. If that doesn’t fix it, then change the other one. Due to multiple wires being hot in this particular type of switch wiring, it can be a little tricky for an amateur to diagnose which 3-way switch failed.Īssuming that the 3-way switches were wired correctly, I suggest that you change one switch. Shut off the electrical power for the circuit at the circuit breaker box. One of your three-way switches may have broken down. Two-way electrical light switches and 3-way light switches are the same, they have different names according to country.
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