Lockout (Red) High

Firebird Lockout (Red) Fault Code

Also written as LOCKOUTRED — same fault.

The Firebird Lockout (Red) fault code means: your boiler's burner has stopped working and has gone into a safety shutdown mode to prevent further damage.. It appears on 1 Firebird model 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: This indicates that there is a burner fault. There are several possible causes, such as fuel supply, ignition failure or other burner related faults.
Typical repair cost £100-£350 (including labour)

DIY fix possible

Check that your external oil tank has plenty of fuel.Ensure the oil supply valve is fully open.Press the illuminated red reset button on the burner once to restart it.

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →

Firebird models that show the Lockout (Red) fault code

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

Source

Firebird Lockout (Red) 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 27 April 2026