When the Connection Unit LED is yellow, it means that the device is offline, that is, it cannot connect to the internet. Verify that the Ethernet cable is properly inserted into the Connection Unit, that the router is turned on and running, and that there are no line/network issues in your area. If after doing these checks the LED remains yellow, contact the operator of your phone line and ask for a quick verification of the router settings.
We remind you that the System, if already registered and associated through the app, will continue to work according to the defined settings (e.g. setpoints, time slots).