BoilerFaultCodesWorcester Bosch 226 Fault Code
The Worcester Bosch 226 fault code means: your boiler is noting that a professional diagnostic tool has been plugged into it; this is an informational record rather than a sign of a mechanical failure.. It appears on 4 Worcester Bosch models in our database.
Technical description: Service tool has been connected In the blocking error history menu it records if the service tool has been connected
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 226 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch 226 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