BoilerFaultCodesWorcester Bosch 227 V Fault Code
Also written as 227V — same fault.
The Worcester Bosch 227 V fault code means: your boiler is failing to light the flame properly, meaning you will not have any heating or hot water until the issue is resolved.. It appears on 10 Worcester Bosch models in our database.
Technical description: No flame signal after ignition burner control unit could need replacing
What causes the Worcester Bosch 227 V fault?
This fault occurs when the boiler's internal computer tries to start a fire but cannot detect a stable flame. The most common reasons are a lack of gas reaching the burner, dirty sensors failing to 'see' the flame, or a fault within the electronic control board that manages the ignition process.
This fault can be more frequent during the first cold snap of winter, as gas valves may stick after long periods of inactivity or external gas regulators may be affected by freezing temperatures.
DIY fix possible
Check if your gas supply is working by testing other gas appliances like a hobEnsure your gas meter has credit if you use a pre-payment meterPress the Reset button on the boiler display panel once to attempt a restart
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Gas Safe Register →Worcester Bosch models that show the 227 V fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch 227 V 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