Another three way wiring question

mike05401March 9, 2014

I just installed a new light fixture in my dining room that is controlled by a three way switch. The wiring at the fixture just had the three wires - black/white/ground. I simply connected the three wires to the new fixture and thought I was done. I did not touch the light switch wiring at all.

However, when I turned the power back on, the three-way no longer works properly.

Switch A, when in the down position, turns the light on. Switch B will now work to turn the light on and off.

Switch A, when in the up position, turns the light off.
Switch B, does not work at all when switch A is up.

Switch A also has a dimmer, which doesn't work with the new fixture.

Where did I go wrong? What can I do to fix this?

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Nothing else in the box? Just the black/white/ground?

What kind of bulbs are you using? Did you switch from incandescent to CFLs perhaps?

    Bookmark   March 9, 2014 at 5:17PM
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Nope, black/white/ground is it. I did switch bulbs - the old fixture had two incandescents and a CFL. New fixture has five LEDs.

    Bookmark   March 9, 2014 at 6:13PM
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Did the three way work before it was fixed?

    Bookmark   March 9, 2014 at 6:17PM
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Yes, it worked fine before I switched the fixture.

    Bookmark   March 9, 2014 at 8:11PM
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Are there other wires in the box on which the fixture is mounted? If so, a connection/splice of one of those conductors could have been disturbed while swapping the fixture.
Granted that splices are supposed to be sturdy enough to withstand such handling, not all are done well enough to meet that standard.

    Bookmark   March 9, 2014 at 8:26PM
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There are no other wires in the ceiling box in which the new fixture is mounted.

    Bookmark   March 9, 2014 at 8:53PM
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If there was truly just those wires in the box the the 3-way either never worked right or one of the switches went bad, most likely it was the dimmer. And just so you know on a 3-way system it doesn't matter which way the switch is; up or down has nothing to do with on or off

    Bookmark   March 9, 2014 at 8:59PM
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So you used to dim CFLs? Is that dimmer rated for CFLs? Rated for LEDs?

    Bookmark   March 9, 2014 at 11:57PM
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