BoilerFaultCodesYour boiler has stopped working because it cannot detect a flame, meaning there is likely a disruption to the gas supply or an issue with the ignition process.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: During operation: flame not detected.
What causes this fault?
This fault occurs when the boiler tries to light but fails to detect a sustained flame, causing it to shut down for safety. The most common reasons include a lack of gas reaching the burner, dirty electrodes that can no longer sense the heat, or a blockage in the drainage pipe that prevents the boiler from firing correctly.
This fault is more common during extreme cold snaps, as the external condensate pipe can freeze, causing a backup that prevents the boiler from lighting.
DIY fix possible
Check that your gas meter is in credit and the gas emergency control valve is open.Check if other gas appliances, like a cooker, are working to confirm gas supply.Press the 'Reset' button on the boiler control panel for five seconds to restart the ignition sequence.During freezing weather, check that the white plastic condensate pipe outside is not frozen or blocked.
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 EA — 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.