BoilerFaultCodesYour boiler is failing to detect a flame when it tries to start, which means it will not provide any heating or hot water until the issue is resolved.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: No ionisation detected after ignition
What causes this fault?
This fault occurs when the boiler's internal sensor fails to detect a flame, even though it may have tried to spark and light several times. The most common reason is that the gas is not reaching the burner properly or the sensor responsible for 'seeing' the flame has become dirty or worn out.
This fault is more common in winter, as extremely cold temperatures can cause external gas meters or condensate pipes to freeze, preventing the boiler from lighting.
DIY fix possible
Check if your gas supply is active by testing another gas appliance like a hob.Check if your gas meter has credit (if using a pre-payment meter).Gently press the Reset button (the blue light or a 'reset' button on the fascia) 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 EA227 — no call-out fees, no surprises.
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Worcester Bosch CDi Classic 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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