E01-591 Emergency

Worcester Bosch E01-591 Fault Code

Also written as E01591 — same fault.

The Worcester Bosch E01-591 fault code means: your boiler has detected an issue with the way fuel is being supplied to the burner, which means it has safely shut itself down to prevent it from running incorrectly.. It appears on 1 Worcester Bosch model in our database.

Act immediately

Turn off your boiler and stop using gas appliances. Call a Gas Safe engineer now. This fault can be dangerous if ignored.

Technical description: Injector Natural Gas
Typical repair cost £150-300 (including labour)

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 E01-591 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Worcester Bosch E01-591 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