BoilerFaultCodesTechnical description
INCORRECT EEPROM SIGNATURE EEPROM not recognised by the processor
What causes this fault?
This fault occurs when the boiler's central brain fails to read the permanent memory chip that stores its specific operating instructions. It is usually caused by a hardware malfunction within the electrical circuitry or a communication failure between the memory chip and the control board. Because the boiler cannot verify its own identity or settings, it shuts down for safety reasons.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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