BoilerFaultCodesFirebird Lock-out Fault Code
Also written as LOCKOUT — same fault.
The Firebird Lock-out fault code means: your boiler has stopped working because the burner failed to light within the required time, and you will need to manually reset it to attempt a restart.. It appears on 2 Firebird models in our database.
Technical description: In case of no ignition the burner goes to lock out in 10 seconds
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Firebird models that show the Lock-out fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Firebird Lock-out fault code information on this page is sourced and cross-checked against the official Firebird service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026