Your boiler's main internal computer has developed a serious technical error and can no longer control the heating process safely.

There is an internal fault in the Automatic Control Module.

What causes this fault?

This fault occurs when the boiler's central brain experiences a critical hardware failure or a memory error. The most common cause is the natural degradation of electronic components on the circuit board, which eventually prevents the unit from performing its safety checks. In some cases, electrical surges or moisture from a small internal leak can also damage these sensitive parts.