BoilerFaultCodesYour boiler has failed to light several times and has shut down for safety, meaning you currently have no heating or 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 lockout
What causes this fault?
This fault occurs when the boiler tries to ignite three times but fails to detect a stable flame, leading the system to shut down for safety. The most common reasons include a lack of gas supply to the unit, a blocked flue, or components inside the burner being too dirty or worn out to create a spark.
This fault is more common during extreme cold snaps, as the external condensate pipe can freeze and back up, preventing the boiler from successfully lighting.
DIY fix possible
Check if your gas supply is active by testing another gas appliance like a hob.Check if your condensate pipe (the white plastic pipe outside) is frozen or blocked.Reset the boiler by turning the control knob to 'Reset' and holding for two 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 L2 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Could it be time for a new boiler?
If repair costs are adding up, a new energy-efficient boiler could be the smarter long-term choice.
Affiliate links — we may earn a commission at no extra cost to you.