BoilerFaultCodesWorcester Bosch 2931 Fault Code
The Worcester Bosch 2931 fault code means: your boiler's main internal computer has encountered a processing error and cannot communicate correctly with the system.. It appears on 9 Worcester Bosch models in our database.
Technical description: System fault boiler electronics / basic controller
What causes the Worcester Bosch 2931 fault?
This fault occurs when the boiler's internal computer chips stop talking to each other correctly, leading to a total communication breakdown. The most common reason is a physical failure of the circuitry on the main control board or a loose internal data connection that prevents the boiler from safely managing the gas and heat. It is essentially the boiler equivalent of a 'blue screen of death' on a computer.
DIY fix possible
Press the 'Reset' button on the front display onceSwitch the main electrical power to the boiler off at the fused spur switchWait 60 seconds and switch the power back on to see if the error clears
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Gas Safe Register →Worcester Bosch models that show the 2931 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch 2931 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