BoilerFaultCodesYour boiler has detected an internal communication problem between its electronic components or a possible electrical connection fault.
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 main control centre loses the ability to talk to the internal components that regulate heat and safety. It is typically caused by a loose electrical connection, a damaged wiring loom, or a failure within the printed circuit board itself. Think of it like a loose cable on a computer that prevents the hardware from receiving instructions properly.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
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A boiler cover plan would cover faults like 23 — no call-out fees, no surprises.
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