BoilerFaultCodesWorcester Bosch Blue light Fault Code
Also written as BLUELIGHT — same fault.
The Worcester Bosch Blue light fault code means: your boiler has stopped working for safety reasons and is waiting for you to manually restart it to try and clear the fault.. It appears on 1 Worcester Bosch model in our database.
Technical description: Lockout reset
DIY fix possible
Locate the blue 'Reset' button on the boiler control panel.Press and hold the reset button for approximately 3 seconds.Observe if the boiler ignites and the blue light stops flashing.
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Worcester Bosch models that show the Blue light fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch Blue light 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 7 July 2026