Check to be sure the traveler wires only connect between the traveler terminals on the switches. Also be sure the neutral from the source is connected to the neutral terminal at the light. A neutral wire will not be used with these switches, although some smart switches may make use of a neutral wire to operate the device.
Three-way switches allow for controlling a light fixture from two separate locations, these are usually used at the top and bottom of a flight of stairs or at two different entrances to a room. On this page are several wiring diagrams that can be used to map 3 way lighting circuits depending on the location of the source with relation to the lights.
This is an updated version of the first arrangement. Because the electrical code as of the 2011 NEC update requires a neutral wire in most new switch boxes, a 3-wire cable runs between the light and switch. The red and black are used for hot and the white neutral wire at the switch box allows for powering a remote controlled switch.
If your switches stop working they may be worn out or the screws may have come loose. If you’ve wired a new switch correctly and the circuit still doesn’t work, the switch may be defective. Check that all connections are tight. Check the switch, remove it from the circuit and test for failure with a continuity tester or multimeter set on the Ohms setting.
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