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Wiring dimmer switches

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  • Wiring dimmer switches

    Can anyone help??
    We've just moved into a property with two separate lights, one at each end of our lounge.
    These lights are controlled by two brand new dimmer switches (one per light).
    The dimmers each have the usual L1, L2 and Common terminals and appear to be wired up from a single cable with four wires; red, blue, yellow (and green/yellow earth)
    Dimmer "A" has the blue cable in its L2 terminal, with the red cable in the Common terminal.
    From this terminal a link appears to run into the Common terminal of Dimmer "B".
    The yelow cable is connected to L2 on Dimmer "B".
    Problem?......only dimmer "B" is working.
    Any one out there that can help me?
    (Please ignore earthing)