BoilerFaultCodesYour boiler is failing to light because it isn't receiving a steady flow of gas.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: No gas supply - gas supply to the boiler has not been turned on or purged sufficiently
What causes this fault?
This fault occurs when the boiler attempts to ignite but cannot detect a flame, usually because the gas supply is blocked or has been interrupted. The most common reasons include a closed manual gas cock, air trapped in the pipes after a service, or a gas valve that is physically unable to open. In some cases, the components that generate the spark or detect the heat may have worn out, preventing the boiler from confirming it has safely lit.
This fault is more common during the first cold snap of winter when gas valves that have been idle through the summer become stuck or fail to respond to the sudden demand for heating.
DIY fix possible
Check that your gas meter has credit and the emergency control valve is turned on.Verify if other gas appliances in your home, like a hob, are working correctly.Press the reset button on the boiler control panel to attempt a restart.
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 Pictogram of a spark — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Glow-worm Xtramax 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.
Affiliate links — we may earn a commission at no extra cost to you.