BoilerFaultCodesWorcester Bosch 2923 Fault Code
The Worcester Bosch 2923 fault code means: your boiler has detected an internal electrical communication error, which means it has stopped running to prevent damage to its electronic components.. It appears on 8 Worcester Bosch models in our database.
Technical description: Boiler electr. system fault
What causes the Worcester Bosch 2923 fault?
This fault occurs when the boiler's internal computer brain loses touch with the sensors and controls it needs to operate safely. It is usually caused by a physical break in the internal wiring or a critical failure within the main circuit board's memory. Because the different parts of the boiler can no longer 'talk' to each other, the system shuts down as a safety precaution.
DIY fix possible
Press the 'Reset' button on the front display panel and hold for three seconds.Wait up to 10 minutes for the boiler to complete its restart sequence.Ensure your household electricity supply is stable and you have not recently had a power cut.
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Gas Safe Register →Worcester Bosch models that show the 2923 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch 2923 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