BoilerFaultCodesYour boiler's main internal computer has developed a malfunction and is no longer able to control the heating process safely.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: There is an internal fault in the Automatic Control Module.
What causes this fault?
This fault occurs when the boiler's main control board experiences an internal electronic failure or a breakdown in communication with other components. The most common reason is age-related wear on the circuit board's microprocessors or a sudden electrical surge that has damaged the delicate internal components.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
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A boiler cover plan would cover faults like 13 — no call-out fees, no surprises.
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