If it had been working properly, and no one touched the switch wiring, it is
a bad switch. If it had never worked properly, it is most likely an
incorrectly wired switch


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3 way electrial wall switch question
The downstairs switch works as expected.
If the upstairs switch is then used to turn the
light off, the downstairs switch does not work.
Is the problem with the switch or is it wired wrong?