Yes, it has a Keypad Lock. The default setting is OFF.
To lock/unlock via the app, select the Device Setting icon, and select Child Lock. The key symbol displays on the control panel when the device is locked.
To turn on/off the lock from the control panel, press and hold the (+) and (-) buttons for 3 seconds. All buttons on the control panel will be locked except the standby button.
https://www.electricradiatorsdirect.co.uk/manuals/reina/Reina-Nika-Manual.pdf