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I replaced a switch with a 3 way dimmer. There are 3 switches plus the dimmer to control 1 light. The only way the switches work is if the dimmer is in the on position then I can put the light on and off with the other switches. Why is that?

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    Short answer: because you wired it up wrong. Show us some pics and/or diagrams of what you've done and someone might be able to help. – brhans Oct 26 '17 at 18:29
  • Was it a 3-way circuit before? Which wires were the messengers? – Harper - Reinstate Monica Oct 26 '17 at 19:18
  • Can you post pictures of the insides of the boxes in question? – ThreePhaseEel Oct 26 '17 at 21:58
  • Voting to close. Not enough information and OP hasn't been back. – isherwood Sep 30 '19 at 20:08
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You wired it wrong, or the switch you added is defective.

If you want more detail than that, update your question with a complete and accurate discription of the circuit, photographs of the wiring you changed, and details (model number) of the dimmer you installed.

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