BoilerFaultCodesWorcester Bosch 254 Fault Code
The Worcester Bosch 254 fault code means: your boiler's internal computer brain is experiencing a critical communication error or software glitch that is preventing it from running.. It appears on 8 Worcester Bosch models in our database.
Technical description: System fault boiler electronics / basic controller
What causes the Worcester Bosch 254 fault?
This fault occurs when the boiler's internal computer chips stop talking to each other correctly, effectively causing the system to freeze or crash. The most common reason is a hardware failure within the main control board or a loose internal connection that has disrupted the flow of data.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Worcester Bosch models that show the 254 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch 254 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