BoilerFaultCodesTechnical description
System fault boiler electronics / basic controller
What causes this fault?
This fault occurs when the boiler's main control board experiences a fatal communication error or a failure in its internal data memory. It is usually caused by a physical components breakdown within the circuitry or an electrical surge that has corrupted the board's software. The boiler stops running because the 'brain' can no longer safely coordinate the heating process.
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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