Electrical – Why would both switches on a 3-way switch fail simultaneously

electricallightingmultiway-switch

My kitchen has six canister lights controlled by a pair of 3-way switches. Yesterday, I flipped one of the switches on and nothing happened. I tried the other with the same result.

When I check the voltage, I get 92V on one switch for both pairs of wires regardless of the switch position. On the other I get 92V from one pair regardless of the switch position, but only millivolts from the other pair if in one position, 92V if in the other position. The lights do nothing regardless of either switch's position.

Do I need to replace one switch? Both? Call an electrician?

Best Answer

Thank you for the comments. All were accurate and educational - although after picking up a new switch and installing it with no luck, my wife asked how I had ruled out the other switch. As I was about to try the other switch, she said "no, I mean the third switch by the back door". I didn't realize there was a switch by the back door other than the porch light. Sure enough that switch was halfway between on and off. As soon as it was flipped on, all of the lights worked again - although I felt pretty foolish.