BoilerFaultCodesYour boiler is failing to light the gas flame required 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
What causes this fault?
This fault occurs when the boiler's control system attempts to light the burner but cannot detect a stable flame after several attempts. The most common reasons are a lack of gas reaching the unit, worn-out spark electrodes that can no longer create a spark, or a faulty gas valve that isn't opening correctly.
This issue is slightly more frequent during the first cold snap of winter, when internal components that have been idle over summer are forced to operate under higher demand.
DIY fix possible
Check that your gas pre-payment meter (if applicable) has credit.Verify that other gas appliances in your home, like a gas hob, are working correctly.Press the 'Reset' button (often marked with a flame symbol) and hold 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 F — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
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.
Affiliate links — we may earn a commission at no extra cost to you.