BoilerFaultCodesWorcester Bosch 283 Fault Code
The Worcester Bosch 283 fault code means: your boiler is currently transitioning between modes or performing a safety check while the burner gets ready to fire up.. It appears on 13 Worcester Bosch models in our database.
Technical description: Burner starting
What causes the Worcester Bosch 283 fault?
This is a normal operational status rather than a fault, occurring as the boiler's internal computer synchronises the gas valve and fan speeds before ignition. It physically represents the moment the boiler is double-checking all safety sensors are satisfied before it allows the burner to light. The code appears briefly during the pre-purge phase to ensure the combustion chamber is clear and safe to operate.
DIY fix possible
Wait a few minutes for the code to clear automaticallyCheck if there is a demand for heating or hot waterReset the boiler only if the code remains frozen for more than 5 minutes
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Worcester Bosch models that show the 283 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch 283 fault code information on this page is sourced and cross-checked against the official Worcester Bosch service / installation manuals for each affected model.
- Worcester Bosch 24/28/35 CDi MkII manual (PDF)
- Worcester Bosch Greenstar 1000 manual (PDF)
- Worcester Bosch Greenstar 12i System manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026