Burner Lockout D High

Firebird Burner Lockout D Fault Code

Also written as BURNERLOCKOUTD — same fault.

The Firebird Burner Lockout D fault code means: your boiler's burner has stopped working for safety reasons, meaning the system cannot fire up to provide heating or hot water.. It appears on 2 Firebird 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 failure of a burner component.
Typical repair cost £120-350 (including labour)

DIY fix possible

Check that you have enough heating oil in your storage tank.Ensure the oil supply valves are fully open.Press the illuminated reset button on the burner once; if it fails to restart or locks out again immediately, do not keep pressing it.

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Firebird models that show the Burner Lockout D fault code

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

Source

Firebird Burner Lockout D 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