The LED indicator light flashes red when
connecting the device to the gateway

When the indicator light flashes red, it means that the switch or dimmer is attempting to connect to the network, but that no gateway is detected. Make sure that the gateway is connected properly and that a connectivity session is enabled.

If the problem persists, it means that the device may be located too far from your gateway. If necessary, move the gateway closer to your device or add a compatible product that can act as a signal repeater between the gateway and the device you want to connect. Be careful; a Zigbee device cannot act as a repeater for Mi-Wi devices and vice versa.