Yes. To reset to default settings, press (power) key to put the heater in standby mode.
Press and hold (power) key for 10 seconds to restore the device to default settings. The full screen will be displayed for 3 seconds, then enter the power off state.
Press (power) key to turn on the radiator.
The defaults are as follows: Comfort Mode is 19°C, Eco Mode is 15.5°C, Anti-Freeze Mode is 7°C, Time is 0000, week is 1, P1-P7 settings are 24 hours in Eco Mode, Temperature Compensation is -2°C, Open Window Detection is OFF, LST Function is OFF, WiFi function is ON.
https://www.electricradiatorsdirect.co.uk/manuals/reina/Reina-Nika-Manual.pdf