BoilerFaultCodesYour boiler's internal computer has encountered a critical communication error and can no longer safely operate the heating system.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Internal control unit error
What causes this fault?
This fault occurs when the boiler's main control board suffers an internal electronic failure, preventing it from processing data correctly. It is often caused by a component on the circuit board wearing out over time or a loose connection in the wiring that links the controls together. Because the 'brain' of the boiler can no longer guarantee safe operation, it shuts down the system entirely.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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