Your boiler’s internal computer has encountered a memory error and cannot safely operate the heater.

GFA-Asic-error

What causes this fault?

This fault occurs when the boiler's main control board experiences an internal memory failure, meaning it can no longer communicate with the safety software. It is typically caused by a microchip hardware failure or an electrical surge that has corrupted the internal data. Because the computer can no longer guarantee the boiler is running safely, it shuts down the entire system as a precaution.