Switch – 3 Way Switch Wiring Weirdness

lightswitch

Setup: Two Switches for one light, one downstairs and one upstairs in a stairwell.

Old Switch Wiring (black is in common of switch)( same type of switch upstairs)

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New Switch: Lutron Maestro Motion Sensor switch, 2-Amp, Single-Pole, White

Wiring:

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So here is the interesting part

With upstairs switch down, black wire from wall to green of new switch causes the new switch to click/switch but no lights

If the switch upstairs is up then the earth grounding wire (to the new switches green wire) works(light turns on) (when upstairs switch is down it doesn't light up)

Any ideas?

Edit: Updated some wording to make it more clear

Best Answer

That switch won’t work in a three-way application. The Lutron website has an FAQ which includes this question. Here is the answer:

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