BoilerFaultCodesWorcester Bosch 226 Fault Code
The Worcester Bosch 226 fault code means: your boiler has logged a note that a technician's diagnostic tool was plugged in while viewing the error history, but this itself is not a functional breakdown.. It appears on 13 Worcester Bosch models in our database.
Technical description: Service tool has been connected in the blocking error history menu
What causes the Worcester Bosch 226 fault?
This code is triggered when a Gas Safe engineer has previously plugged a diagnostic 'Service Tool' into the boiler's circuit board while navigating the error memory menus. It is essentially a digital footprint left behind by a technician's computer and does not indicate a mechanical failure or a physical part breaking. Your boiler will continue to heat your home and water as normal, as this is simply a recorded log of past maintenance activity.
DIY fix possible
Press the 'Reset' button for five seconds to clear the displayMonitor the boiler to see if it resumes normal operationIf the code persists, check if any other fault codes alternate with 226
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Gas Safe Register →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 27 April 2026