Your boiler’s internal control system has encountered a critical electronic failure that it cannot clear itself.

Replace the control panel if the malfunction remains after a reset or if the malfunction has occurred before at this control panel.

What causes this fault?

This fault occurs when the boiler's internal computer experiences a major communication breakdown or a physical failure within its circuitry. The most common reason is that the electronic components on the main control board have worn out or suffered a voltage spike, preventing the boiler from safely managing the heating process.