Your boiler’s control panel has become locked or entered a restricted mode, preventing you from changing any settings or operations.

Control panel locked.

What causes this fault?

This issue occurs when the boiler's internal software triggers a security lock on the control buttons, often due to a specific sequence of accidental presses or a glitch in the programming. In some cases, it can be caused by a communication error between the main circuit board and the display panel, effectively freezing the interface. Usually, it is a safety feature intended to prevent settings from being tampered with rather than a mechanical failure.