The LED blinking in green indicates that your Water Heater Controller has lost the internet connection. You may still be able to control your Water Heater Controller using the TrickleStar App in LAN mode if it did not lose connection to your home Wi-Fi router.To recover the connection to the internet or router:1) Switch off your Water Heater Controller2) Wait for 10 seconds3) Switch on your Water Heater Controller againIf the issue persists, you may need to check on the status of your Wi-Fi router.