BoilerFaultCodesYour boiler's main internal computer has developed a technical hardware fault and is unable to control the system.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Main PCB fault
What causes this fault?
This fault occurs when the boiler's main control board suffers an internal electrical failure or memory error, preventing it from sending instructions to the rest of the unit. The most common reasons are natural wear and tear of sensitive electronic components, or damage caused by an unexpected electrical surge in the home's power supply.
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 F13 — no call-out fees, no surprises.
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