BoilerFaultCodesWorcester Bosch F0258 Fault Code
The Worcester Bosch F0258 fault code means: your boiler's internal computer has encountered a critical communication failure or hardware fault, meaning it cannot process commands to heat your home.. It appears on 1 Worcester Bosch model in our database.
Technical description: Control box or the heat control module (HCM) is defective – HCM or control box connections need to be checked
What causes the Worcester Bosch F0258 fault?
This fault occurs when the boiler's central brain and its memory chip stop talking to each other, often due to an electrical failure or a loose internal connection. The most common reason is that the Heat Control Module—a small plug-in component that stores the boiler's specific settings—has failed or become corrupted. When this link is broken, the boiler shuts down immediately as a safety precaution because it no longer knows how to operate the burner correctly.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Worcester Bosch models that show the F0258 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch F0258 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