What does the Grant Lock-out fault code mean?

Your boiler has detected a problem with the burner ignition and has safely shut itself down to prevent any issues.

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

Typical repair cost for the Grant Lock-out fault is £120-250 including labour.

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

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

Each noise points to a different fault.

Lockout fault with a reset-needed pattern.

Safety-critical — turn off, read this.