BoilerFaultCodesWorcester Bosch EA227 Fault Code
The Worcester Bosch EA227 fault code means: your 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.. It appears on 3 Worcester Bosch models in our database.
Technical description: No ionisation detected after ignition
What causes the Worcester Bosch EA227 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.
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Gas Safe Register →Worcester Bosch models that show the EA227 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch EA227 fault code information on this page is sourced and cross-checked against the official Worcester Bosch service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026