Post person a at the first 3 way box and person b with. In the former case you may simply have a miswiring issue.
Belkin Official Support Supported Configurations For The
Why 3 way switch not working. One with the meter on resistance one tapping pairs of wires together. In the latter one of the switches has likely gone bad. Next remove both switches. First kill the circuit breaker and be sure there is no power to the circuit. What is the wiring pattern of your 3 way switches. Three way switches work by alternating the power connection between 2 legs called travelers.
If one of the two 3 way switches toggles the light s on and off the other 3 way switch has probably failed. Sometimes one of the switches has become defective. There are single pole switches controlling things from a single location three way switches controlling lights or outlets from two locations and for larger homes or complicated situations a four way switch may be used to control lighting or outlets from three or more locations. Touch the probes to the 3 wires removed from the switch until you get a reading on the tester indicating continuity. Set the electrical tester to the continuity or ohms setting. For the second 3 way box which two of the three wires attached to the original switch come from the other 3 way.
You generally need two people working together answer these questions. Each switch powers one or the other leg at all times. Usually when a 3 way switch fails lights can be toggled on and off at one switch but not the other. There are many ways that a three way switch can be wired but usually power or the light fixture connect to the load side of the switch and traveler wires run between traveler screws on both switches. Toggle each switch until the light come on. Sometimes a 3 way circuit doesnt work because someone tried to replace a defective switch and did not properly connect the wires.
Now go the other switch location. At the switch where you found power in step 2 put the other 2 wires you removed from the switch together and wire nut them. To answer questions 1 and 2. The steps i am going to describe may not be the most time efficient way to troubleshoot a 3 way circuit. In this case the traveler wire and load wire were swapped and repairing the circuit involved switching them back. There are a pair of wires that run between the two switches.
Follow these steps to find which switch is bad. The following method will address both problems at once.
Gallery of Why 3 Way Switch Not Working
