BoilerFaultCodesWorcester Bosch Code plug not detected. Fault Code
Also written as CODEPLUGNOTDETECTED — same fault.
The Worcester Bosch Code plug not detected. fault code means: your boiler has lost its unique configuration settings, which means the main internal controller cannot read the instructions it needs to operate correctly.. It appears on 2 Worcester Bosch models in our database.
Technical description: Insert code plug correctly, test and replace if necessary.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Worcester Bosch models that show the Code plug not detected. fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch Code plug not detected. 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