Your boiler has experienced an internal communication error or hardware failure within its control system, causing it to shut down for safety.

Internal fault

What causes this fault?

This fault occurs when the boiler's internal computer system suffers a communication breakdown, meaning the various components can no longer talk to each other correctly. It is usually caused by a hardware failure within the main control board or damage to the connecting wires that carry signals throughout the unit. Because the boiler can no longer verify that it is operating safely, it will shut down immediately to prevent any damage.