BoilerFaultCodesWorcester Bosch Fault 02 / 255 Fault Code
Also written as FAULT02255 — same fault.
The Worcester Bosch Fault 02 / 255 fault code means: your boiler's internal computer has encountered a critical error and can no longer communicate with the heating controls, causing the system to stop working.. It appears on 1 Worcester Bosch model in our database.
Technical description: Internal fault: FW 100 can no longer control the heating system!
What causes the Worcester Bosch Fault 02 / 255 fault?
This fault occurs when the boiler's main control board suffers a hardware failure and loses its ability to send or receive messages from the heating system. The most common reason is an electrical short or component degradation on the printed circuit board, which effectively leaves the boiler without its digital 'brain'.
DIY fix possible
Locate the reset button on the front control panelPress and hold the reset button for five seconds until the display changesWait for the boiler to restart; if the code returns immediately, a professional repair is required
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Gas Safe Register →Worcester Bosch models that show the Fault 02 / 255 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch Fault 02 / 255 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