BoilerFaultCodesWorcester Bosch F1 263 Fault Code
Also written as F1263 — same fault.
The Worcester Bosch F1 263 fault code means: your boiler has detected a critical failure in its internal electronic brain, meaning it has safely shut itself down and cannot operate until the hardware is repaired.. It appears on 2 Worcester Bosch models in our database.
Technical description: Control box or the HCM is defective.
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 F1 263 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch F1 263 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