If the keypad LED is off, an alarm will appear in the top right of the room tab in place of the temperature and this means that the radiator is not connected.
To check, follow steps: Menu-> Rooms-> select room -> select the device -> the radiator will show “Not Connected” on the product tab.
To solve the problem, make sure that the radiator is connected to the power supply. If necessary, disconnect the radiator from the power and then reconnect it.
IMPORTANT: If the room tab does not show the temperature, make sure that there are actually devices connected to the room.