Burner Lockout High

Worcester Bosch Burner Lockout Fault Code

Also written as BURNERLOCKOUT — same fault.

The Worcester Bosch Burner Lockout fault code means: your boiler has failed to light the flame properly and has turned itself off for safety, meaning you currently have no heating or hot water.. It appears on 4 Worcester Bosch models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Gas supply / pressure; Electrodes and gap; Flame sensor; Gas valve monitoring.
Typical repair cost £120-250 (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 Burner Lockout fault code

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

Source

Worcester Bosch Burner Lockout 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 31 August 2026