FALSE FLAME LOCKOUT Emergency

Johnson Starley FALSE FLAME LOCKOUT Fault Code

Also written as FALSEFLAMELOCKOUT — same fault.

The Johnson Starley FALSE FLAME LOCKOUT fault code means: your boiler has detected a flame inside when the system is supposed to be turned off, which is a safety mechanism triggered to prevent incorrect operation.. It appears on 2 Johnson Starley models 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: Boiler detects flame when it should not, or issues with flame sensor electrode
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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Johnson Starley models that show the FALSE FLAME LOCKOUT fault code

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

Source

Johnson Starley FALSE FLAME LOCKOUT fault code information on this page is sourced and cross-checked against the official Johnson Starley service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026