BoilerFaultCodesYour boiler has detected an internal electrical problem that is preventing it from starting up safely.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Boiler electr. system fault
What causes this fault?
This fault occurs when the boiler's main control board fails its internal safety checks during the startup sequence. It is often caused by a communication error between the electrical components or a physical failure within the printed circuit board itself. In some cases, a power surge or moisture ingress can damage the delicate circuitry, leading to this total system shutdown.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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