BoilerFaultCodesYour boiler is unable to start because the small starter flame is not lighting, likely due to a tiny blockage in the gas supply line.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Pilot fails to light. Blocked Pilot Injector
What causes this fault?
This fault occurs when the tiny orifice in the pilot injector becomes restricted by microscopic debris or carbon buildup, preventing the starter flame from reaching the sensor. Without this stable pilot flame, the boiler’s safety system refuses to open the main gas valve to prevent unburned gas from escaping. The most common reason is simply age-related wear or dust being drawn into the pilot assembly over time.
This issue often surfaces after the summer months when the boiler has been switched off for long periods, allowing dust to settle and solidify within the small pilot pipe.
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 A.(3) — 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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