Your boiler’s internal computer has lost its programmed settings and no longer knows how to operate correctly.

wrong parameter from the factory

What causes this fault?

This fault occurs when the boiler's main control board experiences a memory failure or data corruption, causing it to lose its factory-set identity. It essentially means the computer chip no longer understands which model of boiler it is supposed to be controlling. The most common reason is an internal electronic component failure on the PCB, often triggered by an electrical surge or simple age-related wear.