Starting up for the first time: I connected the radiator but it won’t heat up. What do I do? (red LED on) 27 December 2021 15:33 Updated After being plugged in, smart electric radiators need to be paired to the home WiFi system to be able to work (pairing procedure). If the pairing operation is successful, the LED will switch off. Related articles I can’t pair my electric radiator (e.g., network not connected, confirm connection). I paired the electric radiator, but I can’t see it in the app. I don't have an Ethernet cable, can I connect the Connection Unit to WiFi?