Your boiler's control panel has detected that one of the buttons is stuck or faulty, preventing you from changing settings.

DIY fix possible

Identify if any buttons on the front panel feel stuck or recessed.Gently press and release every button on the control panel to see if they click back into place.Gently wipe the control panel with a dry cloth to remove any debris around the buttons.Restart the boiler using the main power switch or reset button.