BoilerFaultCodesWorcester Bosch 2957 Fault Code
The Worcester Bosch 2957 fault code means: your boiler has detected an internal electrical communication error, which means it has stopped working as a safety precaution.. It appears on 8 Worcester Bosch models in our database.
Technical description: Boiler electr. system fault
What causes the Worcester Bosch 2957 fault?
This fault occurs when the boiler's internal computer is unable to communicate with its electrical components, effectively causing the system to lose its 'train of thought'. The most common reason is a hardware failure within the main circuit board or a loose connection in the wiring that links the various sensors together. Because the boiler can no longer verify that it is operating safely, it shuts down immediately to prevent damage.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Worcester Bosch models that show the 2957 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch 2957 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