BoilerFaultCodesYour boiler has tried and failed to light too many times, so it has locked itself out for safety.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Elapsed the number of retrials
What causes this fault?
This fault occurs when the boiler has attempted to ignite several times but failed to detect a stable flame. The most common reasons include a blocked gas supply, worn-out spark electrodes, or a 'sensing' probe that can no longer tell if the burner is actually lit.
This fault is more common during extreme cold snaps, as the external gas meter regulator can freeze or the internal components can struggle with the increased demand for heat.
DIY fix possible
Check that your gas meter is topped up and the emergency control valve is openPress the reset button on the control panel to allow the boiler to try lighting againIf the boiler is frozen, check if the external condensate pipe is blocked with ice
Find a Gas Safe engineer
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A boiler cover plan would cover faults like 13 — no call-out fees, no surprises.
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Could it be time for a new boiler?
If repair costs are adding up, a new energy-efficient boiler could be the smarter long-term choice.
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