Your boiler's internal computer brain has suffered a memory error and can no longer process the data it needs to run safely.

EEPROM error; Electronics defective

What causes this fault?

This fault occurs when the boiler's main control board suffers a critical memory failure, meaning it can no longer read or store the vital settings required to operate. It is usually caused by an internal electrical component failing due to age or a sudden power surge that has corrupted the circuit board's data.