What does the Grant Lock-out fault code mean?

Your boiler's safety system has switched the unit off because it is struggling to ignite or is not receiving enough fuel.

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

Typical repair cost for the Grant Lock-out fault is £100-280 including labour.

Check your oil tank level to ensure you haven't run out of fuel.

Manufacturer manual

Burner malfunction or fuel supply low. Built-in safety circuit switches the burner off and the 'Lock-out' reset button (on the burner) will light.

From this model's manual

Verified against the Grant Euroflame Condensing installation & service manual.

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Boiler cover options

A cover plan would handle faults like Lock-out: no call-out fees, no surprise bills.

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Each noise points to a different fault.

7 signs repair isn't worth it anymore.

Break-even maths on monthly cover.