BoilerFaultCodesYour boiler has stopped working because it cannot light the gas needed to provide heating and hot water.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Ignition fault (lockout) caused by no gas, no detection
What causes this fault?
This fault occurs when the boiler attempts to start up but fails to sense a flame after several attempts. The most common reasons are a lack of gas reaching the unit, a dirty ignition electrode that can no longer spark, or a faulty gas valve failing to open.
This fault is slightly more common during the first cold snap of winter when components that have been idle over summer are suddenly forced to work under high demand.
DIY fix possible
Check if your gas supply is turned on at the meterCheck if other gas appliances, like a hob, are working correctlyPress the reset button (indicated by a flame with a line through it) for five seconds
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like 04 — no call-out fees, no surprises.
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Glow-worm 30ci Plus is discontinued — time for a new one?
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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