How much does it cost to fix Firebird error code lock-out?

Typical repair cost for the Firebird lock-out fault is £120-280 including labour.

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Firebird lock-out Fault Code

Q: What does the Firebird lock-out fault code mean?

Your boiler's burner has shut itself down because it is struggling to draw fuel, likely due to air or debris blocking the internal pump.

Also written as LOCKOUT — same fault.

The Firebird lock-out fault code means: your boiler's burner has shut itself down because it is struggling to draw fuel, likely due to air or debris blocking the internal pump.. It appears on 1 Firebird model in our database.

Technical description: Burner lock-out activates, suggests air in the pump or grit and dirt being forced into the burner pump, resulting in pump blockage or damage.

Typical repair cost £120-280 (including labour)

DIY fix possible

Locate the red reset button on the burner control boxPress the button once to see if the burner restartsCheck that you have sufficient heating oil in your storage tank

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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.

Popular Heatpac Repair: £120-280

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 27 April 2026