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

EEPROM error | Electronics defective

What causes this fault?

This fault occurs when the main control board suffers a permanent memory failure, meaning it can no longer remember the specific settings required to run your boiler safely. The most common reason is a physical hardware defect within the internal circuitry, often caused by age or an electrical surge that has damaged the board’s microchips.