BoilerFaultCodesWorcester Bosch 2928 Fault Code
The Worcester Bosch 2928 fault code means: your boiler's internal computer has encountered a software or hardware error that is preventing it from running properly.. It appears on 9 Worcester Bosch models in our database.
Technical description: Internal fault
What causes the Worcester Bosch 2928 fault?
This fault occurs when the boiler's central control system suffers a communication breakdown between its internal electronic components. It is typically caused by a critical failure within the main circuit board or the digital display unit, meaning the boiler can no longer safely manage the heating process. In some cases, a sudden power surge or moisture ingress can damage these sensitive parts, leading to a complete system freeze.
DIY fix possible
Locate the Reset button on the boiler's front control panel.Press and hold Reset for three seconds.Wait for the boiler to complete its restart sequence to see if the error clears.
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Gas Safe Register →Worcester Bosch models that show the 2928 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch 2928 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