How much does it cost to fix Worcester Bosch error code flame lock-out?

Typical repair cost for the Worcester Bosch flame lock-out fault is £150-350 including labour.

flame lock-out High

Worcester Bosch flame lock-out Fault Code

Q: What does the Worcester Bosch flame lock-out fault code mean?

Your boiler is trying to start but the flame isn't catching, so it has safely shut itself down to prevent gas from building up.

Also written as FLAMELOCKOUT — same fault.

The Worcester Bosch flame lock-out fault code means: your boiler is trying to start but the flame isn't catching, so it has safely shut itself down to prevent gas from building up.. It appears on 1 Worcester Bosch model in our database.

Technical description: The boiler fails to light and the BLUE power indicator (2) will flash.

Typical repair cost £150-350 (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 flame lock-out fault code

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

Greenstar 12Ri Repair: £150-350

Source

Worcester Bosch flame lock-out 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