How much does it cost to fix Grant error code Burner Lock-out?

Typical repair cost for the Grant Burner Lock-out fault is £120-280 including labour.

Burner Lock-out High

Grant Burner Lock-out Fault Code

Q: What does the Grant Burner Lock-out fault code mean?

Your boiler's safety system has detected a problem with the burner and has shut the unit down to prevent damage or unsafe operation.

Also written as BURNERLOCKOUT — same fault.

The Grant Burner Lock-out fault code means: your boiler's safety system has detected a problem with the burner and has shut the unit down to prevent damage or unsafe operation.. It appears on 9 Grant models in our database.

Technical description: If there is a burner malfunction, a built-in safety circuit switches the burner off and the Lock-out reset button will light.

Typical repair cost £120-280 (including labour)

DIY fix possible

Check that you have enough oil in your storage tank.Ensure the oil supply valve is fully open.Wait one minute, then press the illuminated reset button on the burner cover once only.

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Grant models that show the Burner Lock-out fault code

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

Source

Grant Burner Lock-out fault code information on this page is sourced and cross-checked against the official Grant service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026