BoilerFaultCodesWorcester Bosch 249 Fault Code
The Worcester Bosch 249 fault code means: your boiler’s internal computer has encountered a communication error or internal glitch that is preventing it from running properly.. It appears on 8 Worcester Bosch models in our database.
Technical description: System fault boiler electronics / basic controller
What causes the Worcester Bosch 249 fault?
This fault occurs when the boiler's main control board loses its ability to communicate with other internal electronic components. It is typically caused by a data error within the software or a physical failure of the circuitry that manages the boiler's core operations. Think of it as a computer crash where the hardware can no longer process the instructions needed to keep the system running safely.
DIY fix possible
Locate the Reset button on the front control panelPress and hold the Reset button for three seconds until the boiler restartsWait up to 10 minutes for the boiler to complete its startup sequence
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Gas Safe Register →Worcester Bosch models that show the 249 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch 249 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