How much does it cost to fix Grant error code Lockout button lit?

Typical repair cost for the Grant Lockout button lit fault is £120-250 including labour.

Lockout button lit High

Grant Lockout button lit Fault Code

Q: What does the Grant Lockout button lit fault code mean?

Your boiler has detected an issue preventing it from lighting and has shut down for safety; it needs a manual reset to try and start again.

Also written as LOCKOUTBUTTONLIT — same fault.

The Grant Lockout button lit fault code means: your boiler has detected an issue preventing it from lighting and has shut down for safety; it needs a manual reset to try and start again.. It appears on 5 Grant models in our database.

Technical description: Burner Lockout. Press ‘Lockout’ button to reset burner. If burner does not fire – refer to Section 12.4 Burner Fault Finding.

Typical repair cost £120-250 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Grant models that show the Lockout button lit fault code

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

Source

Grant Lockout button lit 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