Your boiler's control panel is experiencing a communication fault, meaning it cannot properly process your button presses or display the correct settings.

DIY fix possible

Check that none of the buttons on the front panel are stuck in the pressed positionGently wipe the control panel with a dry cloth to remove any dirt or debrisPress and hold the Reset button for 5 secondsTurn the power off at the fused spur switch, wait 30 seconds, and turn it back on