BoilerFaultCodesYour boiler is failing to light the gas burner or is losing the flame while it is running, meaning you will 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: No flame detected or flame signal loss during operation
What causes this fault?
This fault occurs when the boiler's internal computer tries to light the gas burner but cannot confirm that a steady flame is present. The most common reasons are a blocked or dirty ignition probe, or a problem with the gas supply preventing the burner from catching light correctly.
This fault is more common in winter, as frozen condensate pipes can cause a backup of water that prevents the boiler from lighting.
DIY fix possible
Check if your gas supply is active by testing another gas appliance like a hob.If the weather is freezing, check if the white plastic condensate pipe leading outside is frozen and thaw with warm water.Press and hold the 'Reset' button for five seconds to see if the boiler restarts.
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 EA227 — no call-out fees, no surprises.
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Worcester Bosch Greenstar Si Combi / i System 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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