BoilerFaultCodesYour boiler has failed to ignite or has lost its flame multiple times, causing the system to lock 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: Final fault code (Refer to section 7.11)
What causes this fault?
This fault occurs when the boiler tries to light the burner but fails to detect a stable flame after several attempts. The most common reasons include a lack of gas supply to the unit, worn-out ignition parts that can no longer create a spark, or a dirty sensor that cannot 'see' the flame even when it is lit.
This fault is more common during extreme cold spells, as external gas meters can occasionally freeze or supply pressures can drop when demand on the local grid is at its peak.
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 03 — no call-out fees, no surprises.
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Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.
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