Ignition lockout High

Worcester Bosch Ignition lockout Fault Code

Also written as IGNITIONLOCKOUT — same fault.

The Worcester Bosch Ignition lockout fault code means: your boiler has stopped working because it failed to light the flame, which means your heating and hot water have turned off for safety.. It appears on 5 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: The fault indicator will flash slowly (approximately once per second). The burner fails to light after 5 attempts and the electricity supply to the gas valve is interrupted.
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 Ignition lockout fault code

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

Source

Worcester Bosch Ignition 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