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.
This arrangement makes it possible to power the heating elements in the appliance using the two 120 volts combined and one 120 volt wire to power timers and lights. This circuit is still used for clothes dryers but not for most new installations of kitchen ranges, for that a 50 amp circuit (pictured below) is now used.
In this diagram the electrical source is at the first switch and the light is located at the end of the circuit. Three-wire cable runs between the switches and 2-wire cable runs to the light. The black and red wires between SW1 and SW2 are connected to the traveler terminals. The hot source is connected to the common terminal on SW1, and the common terminal on SW2 connects to the hot terminal on the light.
In this basic 4 way light circuit the source is at the first switch and the hot connects to the common on that switch. Three-wire cable runs between all the switches and the traveler wires are connected between the two 3-ways and the 4-way. Two-wire cable runs from the last switch to the light fixture and the common on that switch connects to the hot terminal on the light.
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