BoilerFaultCodesYour boiler has detected an electrical communication problem within its internal wiring which is preventing it from running safely.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: check the wiring harness
What causes this fault?
This fault occurs when the boiler's internal components lose the ability to speak to one another through the electrical wiring. It is usually caused by a loose connection, a damaged wire within the main harness, or a failing computer board that can no longer process signals. Because the boiler cannot confirm that all parts are working safely, it shuts down as a precaution.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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