A Linksys velop node blinking red indicates a problem with connecting the node to the network or to other nodes. This issue can be caused by a poor installation, Wi-Fi leaks, or a disconnection of the internet connection. Placing the node close to the main node or router, ensuring adequate power supply, and restarting the node can help solve the problem. By updating the firmware and checking the signaling arm, the node can be restored to normal operation and communication.