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Check that the Dimmer switch is within range of your Hue light.Your Hue Dimmer switch was never connected to a Hue Bridge and was functioning normally but has stopped working correctly: Perform a hard reset of your Dimmer switch by pressing and holding the Setup button on the back of the switch for 10 seconds.Let go when you see the LED indicator light on the front of the switch flash red and green. Restart the Hue Dimmer switch by pressing and holding all four buttons of the switch at the same time.Make sure the configuration settings are correct and select Save to save your settings. In the Hue app, go to Settings > Accessory setup and select the problematic Hue Dimmer switch.If not, this could indicate a problem with the light itself rather than the Dimmer switch. Make sure that the Hue lights you want to control are functioning correctly in the Hue app.Ensure the Dimmer switch was not mounted to a metal surface as this can affect the range of the device.Check that the Dimmer switch is within range by ensuring that it is not farther away from the Bridge than your farthest light.Check that the Dimmer switch is operational by pressing any button and ensuring that the LED indicator light on the front of the switch lights up green.Check that all four LED indicator lights on top of the Hue Bridge are on.Your Dimmer switch was once connected to your Bridge and functioning normally but has stopped working correctly: My Dimmer switch is no longer working properly.