BoilerFaultCodesWorcester Bosch 17 Fault Code
The Worcester Bosch 17 fault code means: your boiler has reached an unsafe temperature and has shut itself down to prevent damage.. It appears on 1 Worcester Bosch model in our database.
Technical description: High limit stat
DIY fix possible
Check that all radiator valves are fully open to allow water to circulate.Ensure there is enough pressure in the system by checking the pressure gauge (should be between 1 and 1.5 bar).Press the 'Reset' button on the front of the boiler and hold it for five seconds.
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Worcester Bosch models that show the 17 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch 17 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 7 July 2026