Your boiler’s control panel has been locked manually or due to a button sequence error, preventing you from changing any settings.

Control panel locked.

What causes this fault?

This code appears because the child lock or control panel lock has been activated, either intentionally or by mistake. It happens when specific buttons on the front of the boiler are held down for too long, which disables the interface to prevent accidental changes to your heating settings. In rare cases, the code can persist if one of the physical buttons has become stuck in the pressed position.