Your boiler has reverted to its original factory settings and needs its specific configuration data entered to work correctly with your heating system.

Factory setting

What causes this fault?

This fault occurs when the boiler's internal computer loses the specific identity code that tells it which model it is. It most commonly happens after a power surge or when a major electronic component, such as the circuit board, has been replaced but not yet programmed. Without this configuration data, the boiler stays in a 'factory default' state and won't ignite for safety reasons.